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The CAPS LED is switched with CAPS LOCK, the NUM LED with SHIFT-NUMGRPH. I assumed you tried all the reset options: https://electrickery.nl/comp/px8/resetting.txt Greetings, Fred Jan

Hi Crashedfiesta, My first guess based on the earlier screen behaviour is a problematic battery pack or battery connector. You could try a power supply ~ 5V DC connected directly to the main PCB instead of the battery pack and see if it improves things. Greetings, Fred Jan P.S. I do have one...

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 and files, just like a 32kByte sized floppy. Technically they are a switchable part of the 6801 co-processor memory map*. The PX-8 runs CP/M, so all program files...

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 used for a terminal and a host, or a 'smart'- terminal and a printer. It should be capable of uploading and downloading assembly text and object code. I tried...

No doubt you've seen the data at http://bitsavers.informatik.uni-stuttgart.de/components/gi/_dataBooks/1982_GI_Microelectronics_Data_Catalog.pdf. It seems the SPR000 is a processor and the SFD2000 the evaluation board with the processor and SP0256. What you are looking for is the "Speech Field...

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. Do you have a reliable source? There appear to be counterfeit for this chip. Greetings, Fred Jan

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 with most MPF-I components still in place, and an integrated board with the MPF-I components re-arranged. The latter is destined 'MT-80AZ The Fox II'. All appear...

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 the files in the image to a PC directory. It is not hard to make, it is just not very often needed. Your options are a FILINK transfer (program on the Util...

@NobodyIsHere: Thanks for the link. The project is somewhat confusing, as it describes a CTS256 processor based device, but the eprom.asm file contains TMS7000 code and a link to the AS macro & cross assembler source (http://john.ccac.rwth-aachen.de:8000/as/). Is the CTS256 a TMS7k application...

Hi, Anyone aware of a TMS7000 assembler that uses the syntax of the original Texas Instruments Assembler? The syntax is well described in the 1989_TI_TMS7000_Family_Data_Manual (original at bitsavers, and a version with bookmarks or proper page numbers at...

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 CPU-memory board (RAM&ROM) with the serial port, six 7-segment LED displays & 32 keys pcb. The plan is to create a simple serial monitor for the base board...

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. Greetings, Fred Jan

Hi jbdigriz, Thanks for the response and the pointers, I will investigate those. For scanning, I'll start with the stuff not found elsewhere. In the mean time I only managed to start up the Evaluation Module (it works!) and dump its ROMs (included here as I didn't create a page for this...

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 selectable division by 5 or 6 (could be a 7490) to get 60 or 50 Hz. Would have been an option for the second version of the LTC board which never happened. Fred Jan

Some info (text, no diagram) can be found in this document, page 1-5: EK-MIC11-TM-002_MicroPDP11_Systems_Technical_Manual_Sep85.pdf. The schematic referred above was derived (IIRC) from a PDP-11/03 schematic which I redrew in KiCAD with added the PX0-600 part. I use an ATX-power supply, so the...

Today the new board started working when I got all pins properly inserted in the sockets. It still needs the fix for the 7.11A firmware, but that is minor. More news planned at https://hackaday.io/project/194159-re-ud-80-a-larger-display-for-epson-px-4-px-8

Recently I could borrow documentation on the TMS7000 microprocessors and MCU's and related development systems. I intend to scan most of it, as I so far could not find much on the internet. If someone found anything, I could try to avoid duplicate work. Most of the titles: TMS7000 TMS7000...

Components are in, the boards are routed and ordered. Expect them in some weeks. @Crashedfiesta: can you make a photo showing the front of the original UD-80? It would look nice on a hackaday project page I am preparing.

That is the gray-level composite output using a RCA-plug. The EF9345 has RGB outputs (via the 6-pin DIN connector) but I am not sure color is usable from the PX-8 or PX-4. Maybe via escape codes? Lacking the manual, the only way to find out is disassembling the firmware. Another interesting...