ISA SCSI adapters - summary of replies

[Paul Stygar]

In article <2683 at bruce.cs.monash.OZ.AU> herbie at bruce.cs.monash.OZ.AU (Andrew Herbert) writes:
>Here is a summary of the information I received regarding AT bus scsi cards.
>Many thanks to the people that replied.
	...
>I have not included prices

	Best price I've seen on the 1542B is at Treasure Chest
	(see ad in Computer Shopper for phone #) ... about $230

>Adaptec AHA1540B/1542B
>----------------------
>* Maximum SCSI->AT transfer rate: 10M bytes/s (motherboard-dependent).
>	(Bus master DMA, => card drives bus directly, not via the PC's DMA
>	controller.)

	Where did this info come from ????
	I didn't see any info in the User Manual for the 1542B 
	to directly confirm this ...

	The board can be jumpered to set the DMA Transfer Speed
	to 5.0, 5.7, 6.7,  or 8.0 MB/s (via PINS 12,13 of the J5 Jumper Block)
	(p. 2-9 of AHA-1540B/1542B User's Manual, Rev 1.0, April 1990).

	Not to mention,  I don't understand this info,  since the 1542B
	seems to run OK on an ancient (circa 1988) MICRONICS 20 Mhz
	motherboard which only supports 4 Mhz DMA transfer rate.


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