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Added the ability to install external ROMs (eg, M9312 ROM images) into the IOPAGE

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Jeff 2016-11-05 12:01:56 -07:00 • committed by Jeff Parsons
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devices/pdp11/rom/M9312/README.md Normal file
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---
layout: page
title: PDP-11 M9312 ROM Images
permalink: /devices/pdp11/rom/M9312/
---
PDP-11 M9312 ROM Images
-----------------------
An assortment of M9312 ROM images, source listings, etc, are available from Don North's [website](http://www.ak6dn.com/PDP-11/M9312/),
some of which we have reproduced here.
Initially, all we had was this [256-word ROM](M9312.json) obtained from Paul Nankervis' [website](http://skn.noip.me/pdp11/iopage.js).
Cross-referencing that ROM with Don North's [M9312 PROM Files](http://www.ak6dn.com/PDP-11/M9312/) revealed that it came from
DEC P/N [23-616F1](23-616F1.txt): "11/60,70 Diagnostic/Console", albeit with some unexpected changes:
165322 022716 165320 L26: cmp #N2,(sp) ; 165320 changed to 000320
...
165332 012716 165342 L27: mov #N3,(sp) ; 165342 changed to 000342
...
165344 012746 165354 mov #N4,-(sp) ; 165354 changed to 000354
...
165354 000137 165362 N4: jmp @#N5 ; 165362 changed to 000362
165360 000000 halt ; 000000 changed to 000200
...
165372 012737 165400 000004 mov #N6,@#4 ; 165400 changed to 000400
...
165406 012737 165714 000114 mov #N12,@#114 ; 165714 changed to 000714
The unmodified [23-616F1](23-616F1.json) ROM can be seen at address 165000 when configured in a
[PDP-11/70](/devices/pdp11/machine/1170/panel/debugger/) like so:
<rom id="m9312" addr="0xEA00" size="0x200" file="/devices/pdp11/rom/M9312/23-616F1.json"/>
As this [PDP-11 website](http://www.pdp-11.nl/pdp11-34a/cpu/options/bootstrap-info.html) explains:
> The M9312 Bootstrap/terminator module contains a complete set of UNIBUS termination resistors and 512 words of ROM that can
be used for diagnostic routines, the console emulation routine and bootstrap programs. The module has 12 jumpers, W1 thu W12,
and five sockets to put ROMs in. One socket is used for a diagnostic ROM for the PDP-11/60 or PDP-11/70, or for a ROM that
contains the console emulation routine and diagnostics for all other PDP-11s. The other four sockets accept ROMs that contain
bootstrap programs.