[Coco] [Color Computer] Floppy contoler Q
gene.heskett at verizon.net
Sun Jan 15 00:15:27 EST 2006
On Saturday 14 January 2006 23:47, Robert Gault wrote:
>Bit6 $FF40 is used by Tandy for drive select 3. However, the
> connection of this bit to the ribbon cable results in it also being a
> side select.
>When single sided drives are used, bit0=drive0, bit1=drive1,
>bit2=drive2, and bit6=drive3. With double sided drives and without any
>hardware changes to the controller or ribbon cable, bit0=drive0,
>bit1=drive1, and bit6= side select.
>You might think that 3 double sided drives could be used because bit6
>could be combined with any of the three bits 0, 1, or 2 resulting in
> 0, 1, 2, $40, $41, or $42. Unfortunately, the controller does not
> permit that because $00 turns off the drives. That leaves you with 1,
> $41, 2, and $42 or two double sided drives. You can however, have two
> double sided drives and one single sided drive at the same time with
> the third drive selected with $40.
Thats not entirely true Robert. I've been running 3 double sided floppy
drives on my coco's for nearly 20 years. Os9 does this correctly at
least, I don't know about DEB and clones as I don't run them. All I
did was put fully populated connectors on my cables.
People having trouble with vz bouncing email to me should add the word
'online' between the 'verizon', and the dot which bypasses vz's
stupid bounce rules. I do use spamassassin too. :-)
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Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
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