25 Feb
2021
25 Feb
'21
3:43 p.m.
On 2/25/2021 1:37 PM, Josh Dersch via cctalk wrote:
On Thu, Feb 25, 2021 at 12:27 PM Al Kossow via cctalk
<cctalk at classiccmp.org>
wrote:
I did a lot of reverse engineering of the RP06 and RM05 schematics.
The implementation in my KS10 FPGA passes all the DSRPA and DSRMB
diagnostics that matter. I didn't simulate all of the sector header
hardware or ECC hardware since the disk already does that.
The register descriptions are at:
https://github.com/KS10FPGA/KS10FPGA/wiki/RPxx-Disk-Simulator
https://github.com/KS10FPGA/KS10FPGA/wiki/RH11-Massbus-Disk-Controller
https://github.com/KS10FPGA/KS10FPGA/issues/8
Rob Doyle.
On 2/25/21 10:43 AM, Chris Zach via cctalk
wrote:
Interesting... Is this obfuscation documented anywhere (beyond looking at
SIMH code?) I was working on an RH11/RPxx emulation for the Unibone that
was partially working (and that I should really get back to...)
- Josh Oh this is fun stuff. Is there a specification
write-up anywhere on the
MASSBUS overall?
there is some documentation on bitsavers
the register descriptions were intentionally obfuscated to prevent cloning
that was figured out to make SIMH work