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FreddyVRetro / ISA-PicoMEM

PicoMEM Doc and Firmware
GNU General Public License v2.0
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Doesn't work on M396F V2.7 (SARC RC2016A) #62

Open andreacampanella opened 2 weeks ago

andreacampanella commented 2 weeks ago

I cannot make the PicoMEM working on this motherboard.

I tried to swap bios a dozen time, the problem is that this board doesn't allow to change the ISA timing as it was very cheap. it's a shame as there is an opesource project about it.

the led on the PicoMEM turns on, but nothing else happens, this is with the last firmware

FreddyVRetro commented 2 weeks ago

Hi,

286 and 386 played with the ISA timing and are too old to have ISA Timing settings... Maybe try to reduce the clock ? (Jumper on the board)

andreacampanella commented 2 weeks ago

No, I went down as much as I can with no luck.

I would like to collect some informations about it, can you tell me which lines I can scope to figure out what's going on?

FreddyVRetro commented 2 weeks ago

Hi,

Do you have something to booth the PC with ? You can test if it is detected with I/O via PMINIT and enable sound card emulation now. also use the DEBUG "D" command to check the BIOS Doing d D000:0000 if setup as default.

Also, ROM Shadow need to be disabled for example

Regarding the signals, no, this is not as simple as this, I need the PC with the PicoMEM on it and logic analyzer to see what is Ok or not.

andreacampanella commented 1 week ago

Yeah, I can boot it from a SCSI card, I will try as soon as I can :)

But also, I have a Saleae logic 16, I can read the entire bus if you want

FreddyVRetro commented 1 week ago

Hi,

If it is timing related and the fast RAM firmware does not work, there is low chance. I am not sure I can speed up the code now, it is already 100% in ARM assembly.

I plan to change the multiplexing in the Next "PicoMEM 2" board, in some months.