> At least under "that other operating system" the 53c700/66 in my panther
> board is slower than AHA1542B
The 53x700 eats CPU, the Adaptec seems better in this case, even
the 1540B which has no CPU.
> Nod. The good side is that the AHA1542 itself is a very simple device
> to interface with - its a smart controller with a 186 or similar on it.
The 1540B was either a custom CPU or a SCSI ASIC. The C models had a
Z80 CPU as far as I know. I personally preferred the B model though
you missed out on some on-board software and a few minor goodies.
> The 1542 supports ISA bus mastering and the CF/CP support
> 10MByte/second fast scsi-2 trasnfers. So you get whatever will fit
> down the ISA bus, which is of course "not enough".
I ran a Linux system for nearly two years with ISA set to 10MHz.
The 1540B kept up with its DIP switches set to 8MHz. It really
got some good transfer rates and was still easy on CPU.
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