M9301-YB Bootstrap/Terminator ROM dumps / listings?

[Paul Anderson]

I recall that the M9301 boots the RX01 but not the RX02, and the M9312
boots both.


On Thu, Apr 30, 2015 at 7:26 PM, Johnny Billquist <bqt at update.uu.se> wrote:

> On 2015-04-30 21:18, Don North wrote:
>
>> On 4/30/2015 9:55 AM, Johnny Billquist wrote:
>>
>>> The per-device code are in separate PROMs that are used in both the
>>> 9301 and 9312. Those are the ones with the device code as constants in
>>> the beginning of memory space for the PROM, by the way. (I seem to
>>> remember someone mentioning this in the past.)
>>>
>>>     Johnny
>>>
>>
>> The M9312 device boot proms are totally different format and structure
>> than the M9301 proms. Not interchangeable.
>>
>
> Hm.. I could have sworn they were the same. Oh well. Figures. :-)
>
>  The M9301 has four 4b wide proms configured as a 512x16 and the console
>> and device boot code all live in this address space.
>>
>
> That is also true of the M9301.
>
>  The M9312 (and the 11/44 also) have one 4b console PROM, and four slots
>> for 4b wide device boot PROMs. Each of the PROMs are nibble accessed to
>> build a 16b word from four 4b nibbles. The PROMs are all independent of
>> one another.
>>
>
> Yes. And this is more or less also how it works on the M9301. However, it
> seems that DEC didn't actually put difference devices in their own roms for
> the M9301, but treated the whole ROM memory as a big chunk with a bunch of
> different devices bootstraps in there.
>
> I thought I remembered moving boot roms from an M9301 to an M9312, but
> that must be my memory playing tricks with me then.
>
>  The 11/44 module has its own console boot code PROM, but it uses the
>> standard M9312 device boot PROMs.
>>
>
> Yes. As do the 11/84 and 11/94, which can take those boot roms in the
> Unibus adapter.
>
>  For the M9312, there are two console PROM variations, one for the
>> 11/04/34/etc class machines, and one for the 11/60/70.
>>
>
> Right.
>
>         Johnny
>
>