My personal opinion is Go, and that means R3081.
It strikes me that if you are saturating a bus with
i/o, it doesn't matter if the CPU is doing it or if
it's DMA, you are bus limited. So I suggest considering
non-dma IDE and floppy interfaces. The existing IDE
driver uses cpu controlled transfers, which are to
a sector buffer that can be accessed at full speed.
Consider:
R3081 CPU $80.00
MOM memory/video/keyboard i/f $30.00
smc37c652 floppy/serial/ide/parallel $20.00
dual-port ram ethernet (8390) _or_ bus-master ethernet (79900) $20.00
bus-master SCSI (53cf90) _or_ how big is the fifo on these? $25.00
Board $100.00
Misc $100.00
total $375.00
They (IDT) say 35 MIPS, 11 MFlops. I believe that's on the
order of a 486dx2-66. Sytem performance would be (because of
the local bus peripherals) on the same order. Correct me if I'm
wrong.
________________________________________________________________
Tim Braun |
Ubitrex Corporation | Voice: 204-942-2992 ext 228
1900-155 Carlton St | FAX: 204-942-3001
Winnipeg, Manitoba, Canada R3C 3H8 | Email: tim@ubitrex.mb.ca
|