Those IDE boards are in fact a very simple boards. Essentially you are just
talking to a 8255 three port chip. If you cannot write, you need to
determine where the log jam is. Using a simple logic probe determine if the
chip CS* lines is going low with a write. If WR* is going low etc. Single step
through a simple continuous write loop in RAM. Eg:-
Start: LD A, 33
OUT PORT_8255, A
JMP START
Follow the signals.
Change ports, repeat.
Switch to reading ports, same thing…
If you have a digital logic probe look at data lines, triggered with each
read/write.
By now there are well over 100 of these boards out there. It must be some
glitch in your system
Good luck
John
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, July 14, 2015 9:04 AM
To: [email protected]
Subject: Re: [N8VEM-S100:7397] Re: V3 Dual IDE/CF S100 Bus board initial checks
Hi Jeff --
>> Had some time to work with my v.3 IDE/CF card today after completing
>> assembly.
I've assembled one of mine. Can't get it to work either. Can't write to the
8255 ports, but I can read from them. That's a complete wipe-out for me.
Couldn't get V1, V2 or V3 to work.
>> - Can MYIDE.COM run on an 8080 or 8085 CPU?
Don't know.
>> - Can MYIDE.COM run under cp/m 2.2? cp/m3 NOT required for MYIDE.COM test /
>> utility program?
Sure. I've been using the single CF version of MYIDE on cp/m 2.2. I've got
the source for it in (cleaner) Z80 assembler, if that would help? But *NOT*
the dual CF version. Haven't tried to work with that yet.
>> Has anyone, maybe Bob Bell, ever run the MYIDE ROM on the California
>> Computer Systems (CCS) 2810 Z80 CPU?
I have a CCS 2810 (actually two), but I've not tried it with that CPU. I'm
running it on a CompuPro CPU-Z (@ 4MHz).
Roger
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