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Have you tried swapping RAM chips around?
> Date: Sat, 21 Feb 2015 22:52:16 -0600 > From: litte...@mchsi.com > To: n8vem...@googlegroups.com > Subject: Re: [N8VEM-S100:6398] Re: IMSAI 8080A CPU board help. > > Josh, > > I'm now using a comm port on the CPU board (w/HyperTerm & WinXP) & (The Console I/O) on the other. > > They echo/mirror each other for key press & screen, but it still won't respond to anything but < R > > for the Ram test that fails @042A > > Todd > > > ----- Original Message ----- > Todd, The firmware outputs to both the 8250 UART port 0 on board (I/O 20h) and to the Console I/O board at I/O 00h. > It will also accept any input from either console. If you connect them both, then you'll see a duplicate. > I was thinking of writing a seek and employee routine that would send messages to a range of I/O address and scan them all for a response ie, "Press <CR> to continue", but the variations were endless and such programming would take too much time. So I just hard coded support for the CONSOLE IO to the routines that already work with the on board uart. > > Cheers, Josh > > -- > You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. |