M9301-YB Bootstrap/Terminator ROM dumps / listings?

Josh Dersch derschjo at gmail.com
Mon Apr 27 02:05:09 CDT 2015

On 4/26/15 11:01 PM, Jörg Hoppe wrote:
> Josh,
> here some resources which may be helpful:
> - can you run the console emulator?
>   To boot: Set all switches on the M9301 to ON and power on
>   OR enter 165020 LAD CTRL-START
I should have clarified, I've been running with all switches set to ON 
(and after the fiasco with the SLU's address DIP switches, I confirmed 
that they're all actually closed :)).  The console emulator does not 
run, either at power-on or manually (I wasn't aware it could be started 
from that address -- I didn't see it in the documentation but I'm sure I 
just skimmed over it...).

At 165000-165776 there's just RAM (I have 128KW installed); At 765000- 
765776 the ROM code appears.  Should the ROM be getting mapped into the 
first 64K of the address space at power-up?

> - if the console emulator runs, you can load any paper tape image 
> diagnostic with my PDP11GUI
>     http://www.retrocmp.com/tools/pdp11gui
> - I organized all known PDP11 diagnostics material into a database
>     http://www.retrocmp.com/tools/pdp-11-diagnostic-database/202-pdp-11-diagnostics-database 
> There you can download paper tape images, and also the *.BIN and *.BIC 
> from XXDP disks. These are in papertape format too.

Very cool!  Once I get things running a bit better I'll have to give 
that a shot.  Thanks for putting that together!

> - I found that the "-YA/B/C../F.." label on M9301's doesn't 
> necessarily match the ROM content.
> - I have dumps of M9301-YA and -YF
> - I can burn M9301 ROMs
> - and I also have a spare DL11-W to offer
Thanks, I may have to take you up on some of that, we'll see...

- Josh

> Joerg
> Am 27.04.2015 um 07:47 schrieb Josh Dersch:
>> The 11/34 seems to be pretty healthy, I've punched in some code to do
>> some basic testing and the CPU seems to be capable of running simple
>> programs and the RAM seems capable of holding data.  So that's good.
>> I've also verified that the console SLU is at the right address and
>> vector (it wasn't initially, due to a pair of bad DIP switch blocks),
>> and I can read/write characters from/to it. Huzzah.
>> The bootstrap ROM doesn't seem to be executing properly, however. After
>> power-on or a BOOT/CTRL It'll run for a fraction of a second and then
>> halt, leaving me at address 0 with 161721 displayed.  ROM Data appears
>> at the expected addresses (773000-773777, 765000-765777) but I don't
>> know if it's at all correct.
>> I need to scare up a second SLU so I can get an emulated TU-58 hooked up
>> to try booting XXDP, but in the meantime I thought I'd see if I could
>> verify the ROM contents manually (it's only 512 bytes long).  I can't
>> find a listing, however -- the operator / maintenance manual doesn't
>> contain it and I haven't found it anywhere else.  I've found a reference
>> to a microfiche, "EP-M9301-RL-A" that supposedly contains these
>> listings, but it doesn't appear to be archived anywhere.  Anyone have
>> this, or have dumps of the M9301-YB PROMs?
>> Thanks,
>> Josh

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