21 Nov
2006
21 Nov
'06
2:40 p.m.
In article <200611212111.kALLBmme028800 at mwave.heeltoe.com>,
Brad Parker <brad at heeltoe.com> writes:
Richard wrote:
...
Are you faking the drive to the controller or faking the controller
to the bus?
Driving Q-bus signals is problematic with current hardware offerings,
again because of voltage levels and rise/fall time constraints.
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The advantage of an FPGA is that it lets you
emulate old hardware as
well, hardware. For instance, I'd really like to be able to run my
PDP-11/03's CPU without powering up the RL01s. The best way to do
this, IMO, would be to provide "fake" RL01s to the RL01 controller as
a piece of FPGA hardware that talked over USB (or whatever) to my PC
to supply the data.
I'm working on that. My real job just keeps getting in the way. I've
gotten it to almost boot rt-11 from a fake rl02. [...]