[Coco] coco sub 64k memory modes

[Stephen H. Fischer]

Don't forget the picture of the developers is in the rom also.

SHF

----- Original Message ----- 
From: "Darren A" <mechacoco at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, August 04, 2009 9:34 AM
Subject: Re: [Coco] coco sub 64k memory modes


> On 8/4/09, Stephen Adolph <twospruces at gmail.com> wrote:
>> Hi Darren,
>> Really?  to me this implies that the 8k roms get copied to upper RAM
>> on power up.  That appears to happen quickly.
>>
>> Neat.
>>
> 
> Yes. The CoCo 3 has a 32K ROM.  The lower 16K contains mostly the same
> code you would find in an Extended Basic CoCo 1/2.  During startup,
> the ROM (along with the Disk Basic ROM if present) is copied to RAM
> and then the CoCo 1/2 code is patched in a few places to call new
> routines in Super Extended Color Basic.
> 
> Darren