*** M E M O R U M ***

I found a copy of the data sheet, bit positions 5828 to 5891 are the "signature bytes". So are not part of the fuses that set up the AND/OR logic. An electronic signature (ES) is provided in every GAL22V10 device. It contains 64 bits of reprogrammable memory that can contain user-defined d...

That doesn't mean a specific fix for any particular game can't be found, but a generic solution was too much for my coding skills.

The Memotech 14L4 PAA devices were limited to 4 terms per pin. So the 512K SDX only made the ram available to CPM. MFX on the other hand uses a much newer 22V10 and that allows 8 to 16 terms depending on the pin. so the full 512k is available in Basic as well as CPM. PEEK (64122) is 15. However that...

So, I'm assuming it's because the game loads into the contiguous 32k starting at 8000h and basic/SDX disk routines shrink that 32k to 21k, thus 28k "doesn't fit" in a 64k machine? Pretty much spot on. From my quick look at the MTX, Football manager's 2 game sections load from #8100 to #EF...

USER MTX can deal with some single stage .MTX files. Anything that more than 1 block of data fails. That's becasue memu can patch the "rom" where the first stage loader make the call to load the next block from tape. On real hardware you can't patch rom, so after the first stage takes over...

Dave has a download of the MTX on his site.

http://primrosebank.net/computers/mtx/m ... are_dl.htm

The edge detection circut on the MTS is based on the 741 op amp. See page 226 of the Phoenix manual. The final stage is a CMOS exclusuve or gate to set the level for the CTC, the rest is analogue and I don't have a clue how it works. I would hope that it was designed to be tolerant of component diff...

I had a quick look at the Pothole Pete code. The program counter in that panel screenshot is at #8141, when it encouneted a #FF byte that triggered Panel. That's in the middle of some sprite tables, the CPU should never have been running code at that point. If the tape had loaded correctly the byte ...

gunrock wrote: ↑31 Oct 2023 22:35 Ah well, pity.

I'll look for some 8x10 bitmap fonts.

I did wonder about the BBC master font, with some hand edits for descenders etc. to make use of the extra rows. But that too has "useful" letters in the 128-143 area.

That does look good, though like Dave, I may be a little based. I tried an inexpensive AV2HDMI upscaler, and while yes it does mean I can use the HDMI input on the TV. However, the imige isn't that great. All the time I have a TV with scart, I'll stick with the passive AV to scart adapter that came ...