24 May
2016
24 May
'16
2:14 p.m.
On Wed, May 25, 2016 at 8:58 AM, Josh Dersch
<JoshD at livingcomputermuseum.org> wrote:
Interesting, the UC17 has the same firmware version
(G143R) on the label of the EPROM. I wonder if the contents are identical. Could you
send me a dump of your ROM so I can compare?
>
> I dumped the memory for this code from the VAX and entered it into SIMH
> to use SIMH as an VAX unassembler and this is what it looks like.
> If the UC17 host resident VAX code is the same, any clues here as to what
> might be causing a halt on the 11/730?
Here's what I found comparing my code with someone else's dump:
I've been working this with Glen Slick. Here's a snippet of a recent
email with him. He provided a dump of the DMAed loader from his UC07:
The raw binary dumped on the VAX looked like this:
>>E/P/L 80
P 00000080 FD310311
>>E
P 00000084 01F83101
>>E
P 00000280 01881611
>>E
P 00000284 8FD0F9AF
>>E
P 00000288 80000003
>>E
P 0000028C 08800C9F
>>E
P 00000290 008FDA20
>>E
P 00000294 04000008
>>E
P 00000298 00028FD0
>>E
P 0000029C 089F8000
>>E
P 000002A0 01200880
First mismatch is here; P 000002A0 0100F308
>>E
P 000002A4 DE121FDA
>>E
P 000002A8 000153EF
>>E
P 000002AC 8FD05100
>>E
P 000002B0 00000200
>>E
P 000002B4 8100D052
>>E
P 000002B8 D0FA52F5
>>E
P 000002BC 0014688F
But mine has P 000002BC FFF4688F
>>E
P 000002C0 65B45520
Mine had P 000002C0 65B45500
>>E
Ran out of time at this point - but enough to establish at least
*some* values are different.
Tried S 80 - different error! ?05 PC=00000344
I did 'I' then started from scratch - D/L/P F26800... etc.
Same result.
Here's a quote from an email exchange from a couple of months ago on
same issue: dumb question: have you tried just booting it without
running FRD?
"I think that UC17 is identical to UC07 firmware-wise. At least my
UC17 EPROM is marked UC07. There is some posts on vcfed.org forum on
UC07 firmware quite recently.
Why do you need to enter the FRD? I never needed to do that. Just
inserted the SCSI2SD with the SD-card in it and booted. Worked
straight away."
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