fjkraan's latest activity

The CAPS LED is switched with CAPS LOCK, the NUM LED with SHIFT-NUMGRPH. I assumed you tried all the reset options...

Hi Crashedfiesta, My first guess based on the earlier screen behaviour is a problematic battery pack or battery connector. You could...

The ROMs the original author referred to are the 'B:' and 'C:' ROMs of the PX-8. These are 'file-system-ROMs', containing a directory...

Hi FarmerPotato, Thanks for the info. I recently tried the EVM and it indeed uses a software UART for the P1 and P2 connectors, to be...

No doubt you've seen the data at...

Yes, I am interested in the DAISY256 board, but the overseas option is probably best for me. And a fun reason to play with the SPO256...

There appear to be at least three versions of the MT-80Z; a board next to a modified MFP-I MicroProfessor board, an integrated board...

Hi Theancientone, These ROM files, both hex and bin are images with a 32kbyte file system. AFAIK, there is no program or script to copy...

@NobodyIsHere: Thanks for the link. The project is somewhat confusing, as it describes a CTS256 processor based device, but the...

Hi, Anyone aware of a TMS7000 assembler that uses the syntax of the original Texas Instruments Assembler? The syntax is well described...

Thanks for the pointer, the TMS3556 looks like a neat chip and still available 2nd hand. Two boards are designed and ordered so far; a...

Congratulations! It is exiting when someone can reproduce something I cobbled together. Greetings, Fred Jan

Most of the documents are scanned and available at https://electrickery.nl/comp/tms7k/doc. The main page is still incomplete...

Hi jbdigriz, Thanks for the response and the pointers, I will investigate those. For scanning, I'll start with the stuff not found...

Before I decided to use the PX0-600, I was thinking about using a 2457600 Hz crystal and a 74HC4060, divide by 8192 to 300 Hz. Then a...