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RE: [N8VEM-S100:2368] Switch Register

Some other front panel uses –


Memory sizing, memory testing – writing known patterns to memory and reading them back (or not)

Peripheral/UART testing – reading/writing control and status registers, terminal i/o

BIOS configuration – build BIOS in RAM, jump to warm/cold start address

Code verification – single stepping through code loops, etc.

Verifying machine state, processor status, interrupt condition, flag status, etc. (depending on your front panel)


Obviously, much of this could be done with a ROM monitor as well, assuming that (a) you have a ROM monitor and (b) you can load it into memory.


Probably lots more, but that’s a pretty good slice –





From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of nbreeden
Sent: Saturday, February 08, 2014 11:31 AM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:2368] Switch Register


My system is old enough it has a switch register on it's Front Panel - I have a few questions.

  - It's on port $FF - is this the correct port for the SR - for some reason I remember it being on $FE?

  - I find it useful for debugging (writing bit patterns to the SR) - Does anyone else use one this way?

  - Are there other uses for the SR?


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