Re: Apple II accelerator card.

[hirschj@vax2.concordia.ca (JACK HIRSCHBERG)]

In article <405pna$r93@crl10.crl.com>, raymac@crl.com (Raymond D. McAnally) writes...
>mrvermin@io.org wrote:
>: In <401jmr$3qm@crl5.crl.com>, raymac@crl.com (Raymond D. McAnally) writes:
> 
>: >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.
>: >-- 
>:  
>:  I find this strange as both the Zip 9/64 as well as the Transwarp work perfectly
>: with the Apple DMA High Speed SCSI Card, with the DMA turned on....
> 
>:  maybe you are only talking about the card in question that this person has. It 
>: predates the Zip so it was before the DMA HS SCSI Card was released. However
>: all cards since then work with the DMA HS SCSI card just fine...
>:  
>:  Joel Blass
>: mrvermin@io.org
> 
> 
>Oops, I forgot to include that I was speaking of a //e. The Zip and 
>Transwarp cards for the GS work just fine with DMA. The card he is 
>talking about is for an Apple ][, ][+ or //e. I assumed he was using the 
>card in one of those machines as it will not function at all in a GS.
>-- 
>-----------------------------------------------------------------------
>     MAC				        	raymac@crl.com
>-----------------------------------------------------------------------

I had exactly the same problem with the 4 and 8 MHz Zip chips
in an apple 2e. I then read the manual where it clearly says 
turn off the DMA on the Hi-Speed SCSI.
--Jack