24 Jan
2014
24 Jan
'14
9:08 p.m.
Found via Hack-a-Day just now...
https://github.com/davecheney/avr11
It apparently can handle booting v6 UNIX on an emulated RK05 at about
10% the speed of real hardware. It requires a custom sheild to add a
couple of 8-pin SPI RAM chips. Directions for that are said to be
coming soon.
-ethan
24 Jan
24 Jan
10:44 p.m.
From: "Ethan Dicks" <ethan.dicks at gmail.com>
Sent: Friday, January 24, 2014 10:08 PM
To: "classiccmp" <classiccmp at classiccmp.org>
Subject: 1/10th speed PDP-11/40 simulator on ATmega2560
Found via Hack-a-Day just now...
https://github.com/davecheney/avr11
It apparently can handle booting v6 UNIX on an emulated RK05 at about
10% the speed of real hardware. It requires a custom sheild to add a
couple of 8-pin SPI RAM chips. Directions for that are said to be
coming soon.
-ethan
On my www.pdp-11.nl/homebrew/pdp8/pdp8startpage.html you can
read that I got a pdp8/e simulator running on the good old 6809.
At 2 Mhz it "performed" at 1/60 of the real pdp8/e.
I wonder how fast that would run on an AVR or PIC.
BTW, in another thread it was written how the software relied on
certain hardware speed aspects, so that executed code was overwritten
at the right moment. That is *also* something I (and Vince) found out in
getting an IDE disk behave as RF08 (to run OS/8 on the 6809) ...
Ahhh, good memories come back ... have to read what I did back then!
- Henk
3992
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ethan.dicks＠gmail.com -
henk.gooijen＠hotmail.com