[Coco] CoCo 3 Projector 3 Blues: The program only gives errors to drive numbers higher than 1 (reposted because of possible size violation of previous message)
devries.bob at gmail.com
Sat Jan 16 00:54:57 EST 2010
Actually the disk drive select bytes are in FD502.DLL, and they are $01 $02
$04 $40, which indicates 4 single-sided drives.
When the BOOT.BAS programme pokes the values, it messes up the drive table,
and stops Vcc from working correctly.
If you REM lines 30, 40, 50 and 60, it may work.
Besides a mathematical inclination, an exceptionally good mastery of one's
native tongue is the most vital asset of a competent programmer.
Edsger W.Dijkstra, 18 June 1975
----- Original Message -----
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, January 16, 2010 3:52 PM
Subject: Re: [Coco] CoCo 3 Projector 3 Blues: The program only gives errors
to drive numbers higher than 1 (reposted because of possible size violation
of previous message)
> RJLCyberPunk wrote:
>> For some reason the program always gives an error message when on tries
>> to read any drives higher than 0 or 1 all other drive numbers 2 and 3
>> return error messages regardless of what disk image might be in it, yes
>> I'm running it on VCC.
> No problems at this end. What DOS is running in VCC? It is possible that
> RGBDOS may have altered values for the drive table and have
> 01 02 41 42 instead of 01 02 04 40. Look for these values in harddisk.dll.
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