Date   : Sat, 29 Jan 2000 09:57:42 +0000
From   : Stuart William McConnachie <stuart@...>
Subject: Re: Possible to scratch build a BBC?

In message <003c01bf69df$37f09380$0101010a@...>, ER
Vaughan <e.vaughan@...> writes
>I was wondering if it is possible to build a BBC from scratch. There would
>not be a problem getting a 6502, pair of 6522s, etc, but what about the more
>obscure chips?
Not only do you have to consider the possible difficulty of obtaining
the chips, but the BBC also has a couple of ULA's (video and serial)
which we'd have to program.

>Also would it be possible to build a BBC on to an ISA or PCI card - the
>screen, keyboard etc could be emulated by software on the PC. On the card
>would be the various outputs which could be used to control hardware at
>present controlled by a real beeb.
Interesting.  This would get round the ULA problem.  Perhaps simpler to
emulate as much as possible (6502, keyboard, screen) and then provide an
ISA interface for the user port, 1Mhz bus, ADC etc.  Of course you can
utilize the PC's existing serial and parallel ports.

>Any thoughts anyone?
It's an interesting project, but I can't see there being much demand for
the finished product!

Regards,
-- 
Stuart McConnachie (stuart@...              )
43 The Hollows, Long Eaton, Nottingham, NG10 2ES, UK
Mobile: 07966 224307