Viking QTO QBUS board (was Re: Viking QTO WBUS board)

From: Greg Elkin <ClassicComputers_at_bouncy-castle.demon.co.uk>
Date: Wed Jun 12 21:10:44 2002

David Barnes wrote
> I will take a look around... I MAY have an eprom...
>
Thanks.

I also need to sort out an address decode PAL if I am to succeed in changing
this QTO to a QDO or better yet a QDT card.

I'm buzzing out the only other socketed chip on the board (a 16L8 PAL) that
is doing the address decode from BBS7, BDAL12-BDAL2 then 4 inputs from
jumpers & providing 1 output to select the Disk CSR/reg & Tape CSR/reg. How
the one select provides for 4 word registers at discontiguous addresses I am
still thinking about...
Then I need to figure out how to blow PALs. Never had the pleasure of doing
that bit of fun yet :)

the two big 48pin devices in the middle of the board would appear to be dual
port rams (1K x 8 each I think from reading the manuals on Zanes site)

Fingers crossed I can get an EPROM image for it.

greg
Received on Wed Jun 12 2002 - 21:10:44 BST