Date   : Fri, 17 Aug 2007 18:51:30 +0100
From   : info@... (Sprow)
Subject: Homebrew TUBE ULAs

In article <46C5D3D5.6010702@...>,
   Jules Richardson <julesrichardsonuk@...> wrote:

> I was wondering whether anyone's ever tried bodging [1] their own TUBE ULA 
> which plugs into the relevant 40-pin socket on a copro and appears to the 
> system just like one of the original ULA parts?
>
> I presume the complexity's not that high by modern standards - but is 
> enough 
> known about the pin functions and internal workings for it to be possible?

Yes.

I have about 10 Ferranti spares in stock, after that if demand was there I
could put the FPGA based Tube ULA from the ARM coprocessor onto a little
carrier board (it'd need some 5V buffering as it only runs at 3.3V) and make
thousands of them.

I could even make the FIFOs bigger, or link selectable depth,
Sprow.