21 Nov
2006
21 Nov
'06
1:11 p.m.
Richard wrote:
...
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. There's still
debugging to be done but the basic concept is working. Basically it's a
small cpld and a tiny arm cpu. It can be a bus master, generate
interupts, dma, whatever. I'm reading the disk image from CF card but
it also has a usb function port (and a serial port).
I hope to finish getting rt11 up in the next month or two. It's been
hanging off an extender card in an 11/44 (on it's side) for a few months
now...
-brad