Date   : Fri, 02 Jan 2009 23:18:13 +0000
From   : pete@... (Pete Turnbull)
Subject: Master Turbo ROM dump?

On 02/01/2009 18:14, Sprow wrote:
> In article <0840AC19CF5C4C4D9775FA0AD444B3E0@...>,
>    Michael Firth <mfirth@...> wrote:
>> Does anyone know why it seems that both 6502 Co-Pros have 4K ROMs, but the 
>> first 2K is always blank?
> 
> The widely touted reason is that after Acorn offered upgrades to users who
> bought early Model A/B machines with MOS 0.10 they had a load of MOS 0.10's
> (4kB EPROMs in a carrier board) on their hands.

MOS 0.10 in EPROM is a set of four 2732s which would live in the four 
sideways ROM sockets, jumpers set appropriately, with BASIC in what 
would otherwise have been the MOS socket.  MOS 0.10 didn't use a carrier 
board; only a few later apps ROMs that came in pairs like BitStik did 
that.  Only the first batch of MOS 0.10 was in EPROM, most were single 
mask ROMs.

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York