[Coco] Dos ROMS.
theother_bob at yahoo.com
Mon Nov 20 10:18:52 EST 2006
I would also like to clarify that RS-DOS should indicate Disk Basic only, not Color Basic or Extended Color Basic without the disk rom. At least that's how I've always perceived it since DOS is an acronym for Disk Operating System.
----- Original Message ----
From: Gene Heskett <gene.heskett at verizon.net>
To: coco at maltedmedia.com
Sent: Sunday, November 19, 2006 7:10:12 PM
Subject: Re: [Coco] Dos ROMS.
On Sunday 19 November 2006 14:28, Mike Pepe wrote:
>Gene Heskett wrote:
>> Humm, that addressing seems to be slightly fubar. IIRC,
>> RS-DOS (Color Basic) lives at $8000-$9FFF.
>> Extended Color Basic lives at $A000-$BFFF I believe and
>> Disk Extended Basic lives at $C000-$DFFF. Only for the coco3 does
>> anything live at $E000 and above (that I know of anyway)
>Gene, not quite right
>Color BASIC starts at $A000
>Extended BASIC starts at $8000
>Disk BASIC starts at $C000, and there's a 'mirror' at $E000 due to the
>16k decoding of the CART output.
I was wrong, and wondered about that as I was typeing. Sorry.
>In fact there was a trick to get 8k more for color basic programs on a
>64k CoCo by copying the ROM to RAM and somehow switching off the
>Extended BASIC functions. I remember it appearing in Rainbow but I'm not
>sure if I ever used it for anything practical.
Yes, I used to do that, then copy Jake Commanders "Chrmakey" enhancment to
the $E000 range where it lived quite happily. That way I still had the
full 24k of ram for basic and one of the neatest code editors ever. Then
I discovered os9. The rest is history. And now historical I'm afraid.
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