UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Slothie · 25th Apr 2019, 10:58 pm

Pictures I have seen of what I believe to be Rev V boards appear to have just pads on the bottom, and no actual connections to them.
While I have no problem with putting XOUT on the connector, I am reluctant to put it in the middle of all those 0v connections on the top, I'd rather put it on one of the "spare" connections on the bottom.
Again, I can't see any real problems in shifting the D0-D7 connections etc to their correct place, but that will still leave you with problems with clashes on the top connector as Sirius has pointed out, requiring mods to your VDU card to resolve.

If I take out support for 65X61 memory devices I might free up enough gates to be able to fully decode the PROM enable - but at the moment these memory chips are reasonably easy to find for reasonable(ish) amounts on ebay/aliexpress wheras the 2111 or AM9111 are only popping up occasionally, usually for £££s.

Decisions decisions! I hate decisions!!!

25th Apr 2019, 10:58 pm	#175
Slothie Octode Join Date: Apr 2018 Location: Newbury, Berkshire, UK. Posts: 1,287	Re: MK14 schematic revisions Pictures I have seen of what I believe to be Rev V boards appear to have just pads on the bottom, and no actual connections to them. While I have no problem with putting XOUT on the connector, I am reluctant to put it in the middle of all those 0v connections on the top, I'd rather put it on one of the "spare" connections on the bottom. Again, I can't see any real problems in shifting the D0-D7 connections etc to their correct place, but that will still leave you with problems with clashes on the top connector as Sirius has pointed out, requiring mods to your VDU card to resolve. If I take out support for 65X61 memory devices I might free up enough gates to be able to fully decode the PROM enable - but at the moment these memory chips are reasonably easy to find for reasonable(ish) amounts on ebay/aliexpress wheras the 2111 or AM9111 are only popping up occasionally, usually for £££s. Decisions decisions! I hate decisions!!!