Remote job submission from PDP-11

Chris Zach cz at
Wed Oct 7 11:11:33 CDT 2020

Ok, here are pics of three of them that I dug out. Ring any bells?

Not as cool as the Chaosnet boards, but still interesting. Each board 
has a Z80A SIO, DMA, DMA,DMA, CPU,and a CTC whatever that was. Three 
EPROMS. One doesn't have the SIO but does have 4 PROMs and one EPROM.

Man, they were odd.

On 10/7/2020 11:06 AM, Ethan Dicks wrote:
> On Wed, Oct 7, 2020 at 9:46 AM Chris Zach via cctalk
> <cctalk at> wrote:
>> I do have a bunch of Unibus 3270/X.25 boards from a third party vendor.
>> Big big boards with a bunch of Z80's on them to do all the protocol
>> work. Anyone interested in me digging them out and figuring out what
>> they were?
> Do you have a way to share photos?  I'd be looking for vendor labels,
> EPROM labels, and especially legible chip photos of 40 or 48-pin DIP
> chips (one or two of which are likely to be USARTs - common ones to
> look for are COM5025 and Zilog Z8530)
> We used the COM5025 on our Unibus COMBOARDs (one model for Bisync and
> one for SNA, but because of memory differences between our own boards,
> not for protocol reasons).  Our VAXBI and Qbus boards, designed after
> 1984, used the Z8530.  We had HASP, 3780, and SNA available for the
> Qbus board.
> There are likely other chips, but those are the ones I have direct
> experience with (and code examples for)
> -ethan

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