riscy
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Re: Mips project Go or Wait?

To: riscy@pyramid.com
Subject: Re: Mips project Go or Wait?
From: tim@ubitrex.mb.ca (Tim Braun)
Date: Thu, 5 Aug 93 17:32:05 CDT
Reply-to: riscy@pyramid.com
Sender: owner-riscy@pyramid.com
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
 

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