Diloq SQ703 to SQ706 conversion

Nigel Johnson nw.johnson at ieee.org
Sun Aug 16 20:06:00 CDT 2020

Thanks for the reply, Glen.

Now, I am not sure where I got that info from, but I believe it was from
this list or maybe netbsd-vax.

My SQ703s have an unpopulated area near the 50 pin connector, and are of
one of the later versions. I have always assumed that was for extra
drivers to do differential SCSI. Is it possible that your board with the
external drivers is for DI?  Or maybe it was an earlier version?

Either way, is your 706 the one without the daughter board?  I have also
heard that the board is capable of doing TMSCP as well as MSCP, but I
can't see doing it at the same time because the register addresses would
be different.



Nigel Johnson, MSc., MIEEE, VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype:  TILBURY2591 nw.johnson at ieee.org

On 16/08/2020 20:58, Glen Slick via cctalk wrote:
> On Sun, Aug 16, 2020 at 8:24 AM Nigel Johnson via cctalk
> <cctalk at classiccmp.org> wrote:
>> So I would like to convert a brand-new DQ703 I have to SQ706 so I can
>> mount SCSI disks.
>> I understand it is just  a prom change.
>> Does anybody have any info, or perhaps a PROM image?
> The two Dilog SQ703 and SQ706 boards that I have are not physically
> identical. One has a SCSI bus driver daughter board and the other does
> not. I don't know if the firmware is swappable between the two. I
> never got around to trying that before the TMSCP board died. The MSCP
> board still worked fine the last time I used it.
> I also have a couple of the later SQ3703 and SQ3706 S-handle versions
> of the boards. On those I did swap the MSCP firmware into the TMSCP
> board and it then worked fine as an MSCP version.

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