Thread: Mk14 vdu
View Single Post
Old 4th Jun 2020, 10:27 am   #40
Slothie
Octode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 1,287
Default Re: Mk14 vdu

On a different note, I've been reading the articles in PE on their VDU project and it looks interesting. It uses a Thompson SFF96364 CRTC which when I looked at it last year seemed unobtainable, but now I see Littlediode advertising on eBay. It's an odd design but has some interesting features, including a RF modulator with inductors and transformer printed on the PCB layout. It has its own 1k of RAM that you could map to 400-7FF and a few control lines that could be connected to the 8154. The RAM is 8 2102 memory chips soldered between two pieces of veroboard to form a memory module that is connected by wires to points on the PCB. This memory chip is unusual in that it has separate inputs and outputs - modifying the circuit to use more easily obtainable ICs might be an interesting project.
Just need to get my stuff back so I can start clearing my backlog of projects!
Slothie is offline