Re: Video Overlay Card

[dempson@swell.actrix.gen.nz (David Empson)]

In article <Jul.21.08.37.57.1993.16593@trident.usacs.rutgers.edu> scraft@trident.usacs.rutgers.edu (Steve Craft) writes:
> The VOC has to sit in slot3?  Only slot3?  That can't be right.

Yes, it's very right.  The VOC has a 32k video buffer in bank $E0 or
$E1 (I forget which) and needs the M2B0 signal to work out which bank
is being addressed.

> Doesn't everyone's accellerator sit in slot3?

Not by design.  An accelerator should work in any slot - it needs the
DMA signals, power, andamounting, all of which  re provided by any
slot.  The only reason that most accelerators are in slot 3 is because
the cable to connect the card to the CPU socket is very short.  If you
use a longer cable, you should be able to put the accelerator
elsewhere (but run the risk of increased noise).

My ZIP GS was originally supplied with a cable that allowed the
accelerator to be in any slot from 1 to 4.  I had it in slot 2 for
most of its life (it died recently).
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz                                                
Snail mail: P.O. Box 27-103, Wellington, New Zealand