Date   : Wed, 03 Nov 2010 16:10:33 -0000
From   : jumbos.bazzar@... (Mark Haysman)
Subject: Reversing the Tube ULA

----- Original Message ----- 
From: "Alan Williams" <awilliams@...>


>A recent thread in c.s.a.h, 'Acorn 15KHz RGB output and upscalers!',
> where I suggested to Theo Markettos than an oil rig in the VIDEOPROC
> socket would be a good spot for a scan rate converter, and he queried
> the availability of a circuit for the VIDEOPROC, makes me think that if
> this sort of reverse engineering was to be undertaken that VIDEOPROC
> should be done as well as TUBE.

There is a block doagram of the VideoProc in the Service manual, and the 
chip logic itself has been done now sucessfully in FPGA by a few people, me 
included - although for the life of me I can't get the flipping cursor to 
size properly! But I know others have.

Mark.