Re: Apple II accelerator card.

[raymac@crl.com (Raymond D. McAnally)]

Paul H Bauer (pbauer@ATHENA.MIT.EDU) wrote:
:         I have 2 "MACH 3.5" accelerator cards for Apple II machines that I
: would like to use in a couple of 2e's. The cards work just fine as long as
: I am operating the machines from the floppy drives, 5.25". If I install a
: SCSI card and hard drive, the system crashes to the monitor as soon as I
: power up. If I remove the accelerator card everything works fine albeit
: slowly.
:  
:         Any ideas?
:  
: pbauer@mit.edu
:  
: PS  Looking under some blocked out printing I can see the letters 

: 		M c T

What you may have there is the old "Speed Demon" card from M c T. They 
were the fore runner to Zip Technologies. What may be happening is that 
you are using an Apple High Speed SCSI card which uses DMA to speed up 
it's processing. If so, turn off the DMA and try it again. The card will 
now function like the older Rev. C SCSI card which is a little slower. 
There are no accelerators that were produced that were compatible with a 
DMA SCSI card. I believe the reason was because they were making use of 
it themselves.
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     MAC				        	raymac@crl.com
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