CYBERYOGI =CO=Windler

Even if you would pay me for the about 200h it took to mod (and understand) the VL-10 (it functions only by 95% anyway) I would not want to do that. May be my eyes are unsuited now to work with SMD anyway. You could have requested me as well to sniff a bucket of industrial glue. Pulsed microwaves are brain destroying technology that I never will use or install anywhere. That is to say, the first thing I do with every hardware I get into my hands is ripping out the wifi card or minimum put a metal dummy plug on the internal antenna cable jack and disable it in BIOS. - Castrate to survive! And modding monophonic into polyphonic is 100% impossible with analogue and 99.5% impossible with digital instruments. You could ask as well to install 256 strings on your violin to replace an orchestra.

By the way, MQ keyboards are manufactured by the Chinese company Jinjiang Shengle Toys. http://www.shengletoys.com/en These tablehooters are made of very flimsy brittle (recycled?) polystyrene plastic that stinks of gasoline, and contain a mess of very flimsy wires. Early models even contained a switching PSU as a tiny PCB dangling on a single screw on its brittle plastic posts - this all connected to the mains jack and other parts with the same flimsy wires. Any hard bump could have torn it loose to start a room fire or electricute headphone wearers. While Yongmei keyboards can be very similar, details look different. E.g. MQ stuff often has an embossed decorative pattern on the plastic case bottom. Most annoying are polyphony flaws by omitted matrix diodes. These can be retrofitted, which however needs very much of unpleasant soldering work using enamelled wires and one diode per key. (I today examined the keys PCB.) The glassy sounding single chip CPU may be made by Holtek (original "My Music Center"), SunPlus or Nyquest. And no, it was no meant to be "Magical Sound Shower". (The nice Outrun theme ran on FM sound hardware almost comparable with a Yamaha DX7 synth.) The Canto HT-70 is not even really a fake (else it would be printed "Casio" and imitate it closer) but a wannabe. Chinese name that "shanzhai", which is a culture that can be rather considered a more or less artistic form of irony than an actual attempt of frauding customers. Yes it may fool some grannies (those saw a real SA-46 in a store when their child pointed at it), but nobody would really confuse both. I do also proclaim "CMD.EXE" (Copyright Must Die - EXEcute it). Such products are not actual fraud. Only the poor quality (polyphony bugs, solvent odour, deadly mains jack in old versions, and of course sweatshop labour) may make them an unethical business. And of course an SA-46 sounds and functions so much better. If you want one, buy it from Casio.

Definitely a fake! I own this tablehooter and love it because undoubtly most will hate. "LIQUID ERYSTAL SHOWER" - WTF!? (fake Casio SA-46) Last week I got on eBay another Casio bootleg shanzhai tablehooter "CANTO HL-70". The thing looks superficially like Casio SA-46 and even the unbranded original box comes in the classic grey-green. The control panel layout (not button writing) is similar but has no volume slider and changed button colours, and it has 37 instead of 32 midsize keys. The proudly advertised USB port is only the 5V supply (alternatively 4 batteries can be used). Instead of the LCD it has a red 3 digit 7 segment LED display, which black frame has a golden clef and note icon at the sides and a big golden engrish writing "LIQUID ERYSTAL SHOWER" (ROFL-copter... - I couldn't stop laughing when I was reading this on eBay). :-) It was bought defective, but after resoldering the speaker wire it came back to life. I haven't analyzed the hardware closer, but the flimsy plastic looks and stinks like Chinese MQ-series toy keyboards (hole for deadly mains jack was obviously removed in the case mould). Inside I found on the keymech embossed text "HL-46". (The "46" suggests where the case style came from.) By trashiness this tablehooter can be considered "My Music Center"-grade. The user interface is very quirky and tends to reset the keypad by timer to the least-useful mode (e.g. rhythm select when rhythm is on). Only 3 digit combinations are recognized, or the +/- buttons, those also select main and rhythm volume. Despite 4-note polyphony, the omitted matrix diodes allow only monophonic play, because certain 2 note combinations truncate each other when pressed slightly harder. (The keys itself don't feel that bad, and soldering 37 diodes in can make it playable.) Even worse, pressing the rhythm start/stop button completely messes up the octave setting of most preset sounds (like organ, flute etc.); apparently certain internal polyphony channels become assigned to a wrong octave or sound, so every 2nd played note (excluding repeated notes) play wrong, which gives an accidental strange arpeggator-like behaviour. This makes rhythm very akward to use, because after starting it, the preset sound needs to be re-selected by hand. The thing has impressive 128 preset sounds (each made from a static waveform with volume envelope, some are doublets) with strong aliasing noise in high notes. The 'effect' button cycles through {sustain, fast vibrato (8hz?), off}. The 128 preset rhythms are made from plain lo-fi samples and mostly sound like algorithmically generated from bit patterns of their number or such things, so many hammer very machine-like (not that bad - can be inspiring for tekkno). Some even include some kind of phasing, like when accents are simulated by playing twice the same drum. There is also the typical monophonic record/playback sequencer found on toy keyboards, and even a simple programmable drum pattern (using the 4 percussion sounds of the drumpad buttons). The 5 demo songs sound poorly arranged like when its sequencer tracks run slightly out of sync. Apparently they can be also used for some kind of learning mode. demos: - Camptown Races - MY Bonnie - Ring De Banjo - Oh! Susannah - Christmas Tree This tablehooter is another nice example what you can expect when a knock-off looks somehow like Casio but isn't.

The Casio VL-10 contains the same hardware like VL-1 (only lacking an envelope follower to smoothen stair steps). I have completely dismantled and modified mine to unlock all VL-1 features as a didactic experiment to find out why Casio didn't. I had to install additional SMD transistors and a tiny inductor (hard to find) to make the (too quiet) VL-Tone sound output play loud enough (I refused to add modern amp ICs not existing when it was made). I had to add lots of thin enamelled wires to make parts fit, and particularly 3 tiny 4-step slide switches and 3.5mm output jack were hard to fit inside at all, but I got it to run and it still uses only the energy of a CR2032 button cell to play all VL-1 sounds (slightly harsh) with recognizable timbre. I am quite sure this hardware could be even powered by a couple of potato or lemon batteries and so constitutes the least energy-hungry classic synth ever made. I also examined my VL-80, which is based on the same CPU and can be modded into a mode with ADSR instead of vibrato switch. (I will likely install a switch to enable this, if I really live long enough.) The rest of VL-1 modes is incompatible with its keyboard layout, because sharps need to be selected by a shift button instead of black keys, those don't exist in the calculator-shaped VL-80.

"LIQUID ERYSTAL SHOWER" - WTF!? (fake Casio SA-46) Last week I got on eBay another Casio bootleg shanzhai tablehooter "CANTO HL-70". The thing looks superficially like Casio SA-46 and even the unbranded original box comes in the classic grey-green. But it is a ridiculous item and another nice example what you can expect when a knock-off looks somehow like Casio but isn't. See here for my review: https://www.casiomusicforums.com/index.php?/topic/17531-rip-off-or-licenced-casio-sa-46/&tab=comments#comment-56402

Yes, I dumped these roms and a couple of others. But I haven't analyzed the file format. The MT-540 ROM contains no complete sounds, but only many small fragments of those an algorithm puts the sounds together (wavetable synthesis). With the program "Wavosaur" I could import the samples and play them. The proper import settings are 16 bit, little endian, unsigned. Pitch depends on the played note (16000Hz sounds recognizeable). But these are not only plain samples; there are also quaterwaves, envelope curves (lookup tables) and program code sections, although fortunately at least the samples are not compressed. As far I remember, there may be some clipping artifacts in the waveforms. The Casio algorithm treat a direct change from the highest to the lowest value (which doesn't happen in properly sampled audio) as a signal to add or subtract a highest bit, so the genuine bit resolution is higher than the 16 bits you see.

see here. The forum hoster "Yahoo Groups" is shutting down in december, which will delete also Casio CZ forums with important tech info. Backup them NOW before it is too late.

To modulate the internal preset sounds, simply point the microphone at the speaker and set the voice effector pitch up or down. The thing can so make wicked noises.

The forum hoster "Yahoo Groups" is shutting down, so all their contents will be DELETED in december 2019. This will also affect many classic Casio keyboard forums with service manuals etc., including casiocollectors (VERY important tech info & files) digitalhorns CZseries CZsynth Please make backups NOW. Grab what you can and run! (Photos can not be directly downloaded with rightclicking in Firefox, so access them in the media(?) tab of page info.) AFAIK Yahoo Groups will be replaced by a push mail service, because the company proclaims that modern users "want" that so. But IMO the real problem is that many classic forums lost their moderator and so got flooded with thousands of spam posting (typically p0rn). Although most spams are in the photos and files sections, each of them caused a text posting "A new file has been uploaded...", making also the discussion forum unusable, because these messages on top can be only skipped by scrolling down a dozen pages, which deters all new users and so dooms these forums to die. And instead of automatically removing only that spam (which can be easily done now by AI due to their repetative nature), Yahoo tended to erase the entire forum if anybody dared to complain there about spam. This pi55ed off all new serious users, so Yahoo Groups made no profit anymore and decided to shutdown everything. The kill of Yahoo Groups will become a black day for the internet - a culturocide exterminating over a decade of collected precious public knowledge in the name of moneymaking. :.( R.I.P.

Dream-what??? I only know a German company "Dream Multimedia" who created the famous Dreambox settopboxes - basical they invented the concept of smart-TV long before Samsung & Co! But Dreamboxes are considered expensive highend products (much like Vorwerk with vacuum cleaners) although the build quality is only mediocre. As a CRT connoisseur I do own a Dreambox DM8000 (because it can record and convert HDTV to PAL and is Linux-programmable), however its internal audio DAC sounds fairly disappointing on my tube amp. The tone is too bright, thin and way too dry to be nice. I expect that HF residues from the (bitstream?) DAC mess up the feedback loop of op-amps in my Panasonic NV-HD625 (a VHS recorder that converts and routes A/V signals to different devices). Analogue recordings and even my old cheapish TechniSat settopbox sound through it much fuller and more natural.

Service mode codes should be kept available (with appropriate warnings). Even those of many CRT monitors and TV sets have been published, despite messing up certain parameters (e.g. maximum voltage and current limits of safety circuits) may destroy irreplaceable components or produce excessive xray emission. With this I don't want to encourage school kids to ruin keyboards in music lessons, but its the same like with any other kind of hacking knowledge - the light and the dark side of cybernetics.

Was only the firmware replaced by some magic (i.e. secret procedures, possibly involving use of test pins) or was the entire mainboard or a new flash chip soldered in? Epoxy is not only to camouflage things. A COB IC only indicates that something emits not much heat and is cheaply mass-produced in large quantities. It would not surprise me if Casio uses exactly the same PCB now in a dozens of keyboard models those only differ in software that is later loaded into flash memory. For professional hardware developers it is quite easy to dissolve the black blob (websearch: "decapping") to analyze the CPU die under a microscope and so identify if it is anything generic. I collect strange tablehooters and yet never found any Chinese faked brand keyboards containing pirated software of the original. Only some Yamaha FM and squarewave sound engines found their way into Chinese stuff, but this is no surprise at all since Yamaha had spread those ICs everywhere in the wild (or even licensed its contents?) for arcade and console games, homecomputers and PC soundcards.

May be the service mode is poorly designed an can e.g. erase the entire flash rom and so brick the keyboard if a wrong button is pressed (remember the many XW-P1 flash update disasters), and so Casio wants to avoid school kids in music classes messing around with it. But IMO it must be the right of the sovereignous customer to repair things (not least to prevent e-waste) and get the necessary info. A service mode should be designed in such a way that harmless and potentially destructive functions stay separate and that the latter e.g. need an additional long and complicated number to be typed in for access, or even closing a mainboard jumper inside.

If you want to use a big lithium battery without messing with bare cells (they are fire bombs when misused), you may consider buying a good quality smartphone powerbank and connect a stepup voltage converter to its USB port if 5V is not enough to power the keyboard. Regard that in general I detest lithium rechargables due to fire risk, so I personally would never want to do this. But people with RasPi (hobbyist computer module) often use such powerbanks to run all kinds of homemade gadgets.

Do not use a dishwasher! The aggressive cleaning agent may dissolve the carbon tracks of potentiometers and carbon paint traces (e.g. at rubber contacts). Of course remove all batteries (also soldered ones - MT-65 contains none) before wet cleaning. Washing a PCB in bathtub with hand dishwashing soap is much safer. I read that leaving a drop of concentrated dishwashing soap on a battery acid infested spot soak for some hours can neutralise it. Later thoroughly rinse the PCB with freshwater (shower). Dry it with tissues and hairdryer (medium heat). Clean oxidized switch contacts with isopropanol and a cotton swab. Alkaline batteries are actually alkalic instead of acid (forming white powder and greenspan). Only zinc-carbon had actual acid in it (leaving brown rust stains). Both needs to be removed to stop corrosion. To search for acid damaged PCB traces with a DMM, particularly look for traces with black spots under the green paint. These are corroded and may be interrupted. Also through-hole contacts between PCB sides or multilayer traces tend to corrode away. Remove paint and greenspan at such spots with sand paper and solder a thin wire across the gap.

Even if Casio does not focus on professional instruments anymore, please at least add something like a couple of sysex parameters to let interested people tweak internal registers of the sound synthesis engine through midi (like it was done in Casio CZ-230S). Things like CTK-1000 or even first SA-series had exciting sound that would deserve to be made fully editable and saveable to external memory. Even if this does not rapidly boost sale to add some cheap sysex (without user interface), it will for sure increase curiosity of pro musicians into Casio instruments and finally raise its reputation among them.

Most interesting is that the MT-65 sound IC "D931C" can be software controlled. Robin Whittle identified in 1980th the (very counterintuitive) serial data format, so a microcontroller can be hooked to its 4-bit bus to define own preset sounds. Here someone made an editor for it: https://wolfeffect.wordpress.com/casio-931-chip-editor

The SK-1 employs analogue envelope generators, routing the 4 waveform channels through each a VCA. If anything goes wrong here, it may make continuous tones or lack certain channels. The service manual with schematics can be found on Elektrotanya etc.

The Casio DM-100 contains only one half of an SK-8, i.e. it lacks the (rom sample) percussion IC. While the main CPU (MT-240) of the lower manual can handle midi, the SK-8 never was designed to support it, so it would have needed a complicated additional microcontroller to handle both keyboards, which would have significantly increased cost. Yamaha VSS-200 is another such mashup cucumber; it contains the FM keyboard hardware of PSS-270 combined with the sample keyboard VSS-30 (some buttons omitted), which resamples the FM of the PSS-270 to treat it with effects. But the wiring only assignes both CPUs to different keyboard split sections, not dual manual. ROM hacking? Casio MT-240, MT-540, MT-640 and their many fullsize variants (MT-640 has none) are all built around the CPU "NEC D938GD" and only have different external roms. The MT-540 contains 2 16bit ROMs with all important pins wired parallel except A17. At the HN62404P also the BYTE pin 31 (the other ROM lacks it) is wired to +5V to prevent 8bit mode. Despite both pinouts are like an eprom 27C400, the HN62404P contains here a little trick that makes it appear empty (all #FF) when read in an eprommer, namely the OE/ pin is inverted and thus needs +5V instead of 0V to output data. (In an adapter I bent it away and connected it with Vdd to do this.) Likely this was done to simplify multiplexing by toggling between both roms through the OE/ line (but it also might have been a stupid copy protection attempt). With HN62404P removed, the MT-540 still boots properly, but lacks the piano and effect sounds (there are also some popping glitch noises), which shows that the operating system and most samples are in the smaller 2nd ROM D23C2000AC-1 (without that it can not run at all). I later verified this in MT-540 service manual. I compared a Casio CSM-1 rom dump with my MT-540 roms and they are identical. In opposite to this, the Casio MT-240 contains a "HN62404P D27" as its only ROM (can not run when removed), and the OE/ pin of this one behaves normal (not inverted). The same ROM was also used for the lower keyboard of Casio DM-100 and in Hohner PSK50 (seen in service manual). Hohner PSK55 (seen in schematics) has a "HN62404P H84" instead. (According to parts list in service manuals, the software number seems to be the lower 3 digits.) Although I haven't done this, I think it may be possible to upgrade the MT-240 (and related keyboards) with MT-540 sounds. For this you would need to copy both MT-540 ROMs on each a 27C400 eprom. Desolder the MT-240 ROM and install a 40 pin DIL IC sockets in its place and another one in the 2 unlabelled hole rows next to it. Install 2 short wire bridges in the empty hole pairs between both sockets and above the empty one. A little complicated is that you need to cut the OE/ line to pin 12 of the HN62404P socket and invert it (using a CMOS inverter IC or transistor). Connect the inverted OE/ to pin 12 of the HN62404P socket and the uninverted OE/ to pin 12 of the unlabelled socket. The eprom with the contents of the MT-540 HN62404P (software number G93) is inserted instead of the old HN62404P, and the eprom with D23C2000AC-1 content into the unlabelled socket (both facing to the same direction, i.e. notch facing at PCB rim). And of course you need to add the missing effect pads and switches to the keyboard matrix. If you want to keep also the old behaviour, you may additionally solder the original HN62404P piggyback onto the new eprom in its place (wire its /OE line uninverted). Disconnect the /CE input (pin 10) and install a switch that connects either the upper (old) or the 2 lower (new) ROMs with the /CE output of the CPU. Add a pullup resistor (about 10 kOhm?) against +5V at both banks to disable the unused bank. (Flip the switch with the keyboard powered off, else it may crash, which may be suited for shitshot.) A mechanically simpler variant to avoid the piggyback soldering would be to use a larger capacity eprom (27C800?) with 42 pins (lower pins are the same pinout) and burn additionally the content of the old ROM into the upper half. Connect the switch output at the A18 address line to switch between both banks. It may even be possible to use only a single eprom with enough capacity (27C160) by burning the D23C2000AC-1 contents into an additional bank and connecting /OE only(?) to A19 to simulate the multiplexing. But this is all theory; I haven't done any of these and can not promise that it works. Many of these mods may also function with Casio MT-640. According to its manual it e.g. has 10 additional preset sounds through MIDI, those likely also exist as matrix eastereggs. Its 2 ROMs are "NEC D23C2000AC-1 503" and "HN62404P Z29", those might be also addable as a bank switch mod fot MT-240. I haven't tested this, so I don't know if e.g. the different software numbers of the D938GD CPUs may prevent it.

Yesterday I started to analyze my Casio VL-80 musical calculator. I started 2:00 AM, messed around with SMD parts (soldered diodes in for test, wires fell off again and again or debris fell between CPU pins) and so (mind-clouded by solder smoke) got to bed not before 12:00 AM. yuck! :6 (I hope it survives all that experimental surgery.) - Casio VL-80 CPU= "NEC D1867G" (64 pin DIL) demo: "Yama No Ongakuka" Despite the user interface differs, I found out that it really is based on the regular Casio VL-1 CPU "D1867G" (print is invisible because it is soldered upside-down). 3 fixed diode places (actually only a bridge here) switch it into VL-80 mode, which makes a matrix place become a shift button ("# ±") to switch natural into sharp notes (also changes/disables some other buttons). There is even a mode with ADSR synth that supports shift (i.e. the given vibrato slide switch becomes "ADSR" to use M+ memory for synth parameters), which despite many restrictions (lack of switches) is an exciting easteregg in this tiny Kraftwerk gadget; it suggests that Casio likely had planned to build such a more advanced version and found it too complicated to use for novices by lack of normal preset sound switches. Unfortunately the octave switch feature is unuseable here, because in normal VL-1 mode (which includes it) does not support the shift button (necessary by lack of sharp keys). Connecting both diodes only switches the octave low but still disables the shift button. Certainly the VL-10 (haven't analyzed yet) also uses the same CPU in one of these modes.

If you are interested in a unique sweet sounding Casio e-piano sound, watch out for classic SA-series small keyboards. These contain a single-chip softsynth with special FM/phase distortion algorithms (e.g. "triangular wave modulation") not found in professional casios. The longest keyboards with this e-piano are MA-120/MA-130 (49 keys, no velocity). I have now analyzed the CPUs of Casio musical calculators. There are only 2 hardware families. All 3 with clock (Melody-80, ML-81, ML-90) have basically the same CPU pinout. 3 without clock (MG-880, ML-831, ML-833) employ a smaller CPU with also each the same pinout. All other musical calculator models seem to be only case variants of these. I don't own yet an UC-365 or UC-360, but I suspect its CPU to be yet another software variant of the one with clock. - Casio MG-880 CPU= "NEC D1822G 001, K0729K" (52 pin SMD) melody "When The Saints Go Marchin' In" - Casio ML-831 CPU= "NEC D893G, E9Z236" (52 pin SMD) no melodies - Casio ML-833 CPU= "NEC D1822G 002, K0Y64K" (52 pin SMD) 3 melodies "Nocturne OP 9 n°2" by Frédéric Chopin "Picnic" (British folk song) "Romanza de Amor" (Spanish folk song) - Casio Melody-80 CPU= "NEC D1863G, K93926-912, Japan" (64 pin SMD) 3 melodies Alarm-1: "Tarantella Napoletana" (traditional) Alarm-2: "For Elise" by Beethoven Timer: ascending cadence This little instrument of 1979 was Casio's first musical calculator. Unlike later models, the timbre is a rough squarewave piezo beep (resembling bagpipes) with a crude sort of square tremolo, i.e. the buzzy tone is interrupted by short pauses 4 times per second, which resembles a purring stutter dial tone of US phone service or tabletop electronic games of its era. - Casio ML-81 CPU= "NEC D1864G, E0205K-007, Japan" (64 pin SMD) 3 melodies Alarm-1: "Frühlingslied" by Mendelson Alarm-2: "Träumerei" by Schumann Timer: "Moments Musicaux No. 3" by Schubert - Casio ML-90 CPU= likely "NEC D1864G" (64 pin SMD, software number unknown, soldered upside-down) The 12 melodies are: * alarm-I "Whistler And His Dog" by Prior "Le Primavera" (Le Quattro Stagioni) by Antonio Vivaldi "Menuet de l'Arièsienne" by George Bizet "Holdilidi" (Swiss folk song) "Gavotte" by F.J. Gossec "Beautiful Dreamer" by S.C. Foster "Picnic" (British folk song) electronic buzzer (30 seconds) * alarm-II German folk song* (genuinely Japanese children song "Yama No Ongakuka") electronic buzzer (30 seconds) * date memory-I Happy Birthday (M. Hill) * date memory-II "Wedding March" by Mendelssohn "Trinklied" (German folk song) * christmas Jingle Bells (by J.S. Pierpont) * time signal "Big Ben" (Westminster) The ML-90 is the only one with a Jasrac number (i.e. still copyrighted songs included). The back of the manual booklet shows a JASRAC number M4A0057 for royalties of the built-in musics (or the included "Twinkle Twinkle Little Star" score sheet?). The so-called "German folk song" also here is genuinely the Japanese children song "Yama No Ongakuka" (falsely known as "Unterlanders Heimweh"). It would not surprise me if the 2nd German folk song "Trinklied" (means "drinking-song") is fake too; at least I don't know it. Has anybody identified it?

Casio HZ-600 is a similar strange thing. Despite it lacks internal speakers, the PCB was designed to contain a fullsize power amp IC (but without heatsink, if I remember well).

Bleach decomposes many kinds of rubber. Likely it killed the rubber contact strip under the keys, or made the carbon contacts of it non-conducting. Take out the rubber strips and (if they don't crumble apart now, else you need new ones) wash them thoroughly in water with dishwashing detergent, rinse in clear water and dry them with tissues. Carefully clean each of the black rubber contact dots with cotton swab and isopropanol and test with multimeter if they are still conductive (minimum something like 10 kOhm). On the keys PCB are carbon traces and contacts those may have decomposed by bleach too. Take out the keys PCB and wash it too. Measure with multimeter if the carbon traces do conduct. If not, solder wired across them or use conductive silver paint to reconnect them. (I did this only with smaller keyboards like a PT-50 decomposed by battery acid, but general principles should be the same.)

Casio SA-series "PCM engine" was not at all a simple sample player, but a sophisticated and surprsingly versatile softsynth on a chip. One of its unique synthesis forms was the FM variant "triangular wave modulation", which likely was used for piano and all wind instrument sounds. See here for tech info: Triangular Wave Modulation = Phase Distortion? (Casio PCM engine patents)

I have installed 1.44MB diskette drives inside my Amiga (very redesigned Amiga 500 in wooden desktop case), which hardware can generally only handle 720K diskettes (due to low clock rate, but formatted at 880K). When I insert 1.44MB diskettes, it generally fails to read or format them, unless I put adhesive film over the upper left corner hole of the diskette to make the drive treat it as 720K. Likely parameters like bias current or simply the data rate to an internal buffer differs in both modes, so a 720K mainboard (Amiga 500) with 1.44MB diskette drive fails to read or write 1.44MB diskettes because drive and mainboard are in different modes. Can an intact Casio MZ2000 read 1.44MB diskettes at all? If not, it is likely the same situation than in Amiga.