Piotr

[Alex Barragan @AlexSlashGan]

Another CASIO PB-2000C with DL-Pascal 1.2 on the motherboard roams the Earth.
Story: https://t.co/PB6YJKz1mZ

[Piotr @Piotr86419271]

@tshibuki 10 GOTO 10
fails with ERR7

[Alex Barragan @AlexSlashGan]

Piotr and The Seven Segments
Controlling the MD-120 Seven Segment Display from a VX-4.
Explore the project’s album/ directory.

Report: https://t.co/z9GnMxXtaF
Build: https://t.co/XX6DUrxAtL

[Alex Barragan @AlexSlashGan]

Chapter 1.5 of HD61700 Programming with SOL
Doc: https://t.co/nrid9nHX3s
https://t.co/RuM6DsIIKT
build:
https://t.co/CbAncI1HtH

[Piotr @Piotr86419271]

Does anyone know what might have been inserted into this slot?

[Piotr @Piotr86419271]

On the top of the Casio MD-120 floppy disk drive unit, there is a slot with a connector, likely intended for some kind of memory card. In the ROM dump, I found the following string of characters: "マシン語　カード", which translates to "machine language card."

[Piotr @Piotr86419271]

@swartz_de The clock frequency value is not precise, as it is set by the 180 kΩ resistor connected between the OSI and OSO pins. The clock frequency measured in my FX-702P is 228 kHz, and the bus frequency is 114 kHz.

[Piotr @Piotr86419271]

@swartz_de The clock frequency measured at the OSO pin is twice the bus frequency (signals Ø1, Ø2). Both CPUs run at the same speed, because the second CPU uses the Ø1, Ø2 signals generated by the first CPU.

[Piotr @Piotr86419271]

@tshibuki I noticed that it is not possible to enter numbers with a negative exponent, e.g., 1E-3.

[Alex Barragan @AlexSlashGan]

An encouraging result of my HD61700 corpus for Sol (ChatGPT6) . The proper diagnostic and fix for a MD-120 firmware bug found by Piotr. Fix flashed and tested. Read the reports co-authored with Sol.
https://t.co/DlYFtxPTi2

[Piotr @Piotr86419271]

@loutre04439274 @poyokoma_danna Well done!

[Piotr @Piotr86419271]

@loutre04439274 @poyokoma_danna Did you solder the jumper marked "G271 SHORT"?

[Piotr @Piotr86419271]

@AlexSlashGan @hd61yukimizake @JAMA870P Hi Alex 😀The VX-3 doesn't check the RAM size. The "Training Board" menu is always active.

[Piotr @Piotr86419271]

@hd61yukimizake Thank you for all the information! Apparently the VX-4 communicates with the board through the serial port.

[Piotr @Piotr86419271]

@JAMA870P @hd61yukimizake Yes, this option is disabled if 32KB of RAM is detected, as in my upgraded VX-4.

[Piotr @Piotr86419271]

Does anyone know what the "Training Board" menu is for on the Casio VX-3 and VX-4?

[Piotr @Piotr86419271]

@UTE6uicBoX5lVb1 I'm really happy the Katakana conversion is now working as expected. Thanks for your patience and detailed verification!

[Piotr @Piotr86419271]

@UTE6uicBoX5lVb1 I apologize for my sloppiness. Multiple occurrences of STW in the internal ROM were wrongly identified as ST. I hope everything is fine now.

[Piotr @Piotr86419271]

@UTE6uicBoX5lVb1 I fixed another mistake in the microprocessor's internal ROM image "rom0.bin". The bug also affected the AI-1000 emulator. Thank you for your cooperation!