On Tue, 5 Jun 2012, Steven Hirsch wrote:
On 06/04/2012 10:49 AM, Hugh Hood wrote:
Steve:
I booted up RoboCAD on my IIe this morning and tested:
A. Ctrl-Reset -> RoboCAD 'traps' the reset key and presents a message about
'Press Return to Continue'
This keeps you from losing your drawing and keeps (most) folks out of the
monitor for disassembly
B. OA-Ctrl-Reset -> the machine reboots
This is in a machine with a Transwarp (with the Saturn card selection), so
throw that variable into my test results.
I cannot reproduce that, leading me to believe that I do have a problem with
the Saturn board. I'm going to try swapping out some of the LS TTL logic
for newer parts and see if I can get it to behave.
Would still be great if someone had the schematic.
I recall that it used that pair of Motorola ICs designed for controlling
dynamic ram, one is a multiplexer the other is a controller. Large multipin
ICs, and they should jump out when you look at the board. There should be a
datasheet or application note devoted to those ICs, and I suspect the board
can't be much different from that "typical design". That would make a good
start to a schematic, the interface to the bus can't be too complicated.