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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!news.funet.fi!funic!nntp.hut.fi!nntp!iisakkil
- From: iisakkil@lk-hp-21.hut.fi (Mika Iisakkila)
- Subject: Re: Speedstar 24 faq (Zeos)
- In-Reply-To: wlsmith@valve.heart.rri.uwo.ca's message of Tue, 17 Nov 1992 16:28:05 GMT
- Message-ID: <IISAKKIL.92Nov18174645@lk-hp-21.hut.fi>
- Sender: usenet@nntp.hut.fi (Usenet pseudouser id)
- Nntp-Posting-Host: lk-hp-21.hut.fi
- Organization: Helsinki University of Technology, Finland
- References: <1992Nov17.162805.26578@julian.uwo.ca>
- Date: 18 Nov 92 15:46:45 GMT
- Lines: 28
-
- wlsmith@valve.heart.rri.uwo.ca (Wayne Smith) writes:
- >2) What is the fastest bus speed the card will work at.
-
- My experience in a 486DX-50 system with UMC chip set:
- At 10MHz bus, 0 wait state on SS24x the card seems to work but often
- hangs in Windows (a total machine lock-up). With 0WS disabled, the
- SpeedStar works fine but the slowdown is noticeable in Windows.
-
- At higher bus speeds (I tried 12.5 and 16.7 MHz) the SS24x again
- seemed to work fine under DOS but in Windows everything moving tended
- to produce garbage on the screen and eventually the system crashed.
- For comparison, my Adaptec 1522 SCSI adapter worked fine even at 16.7
- but disk transfer rate didn't improve (according to Coretest). At
- 25 MHz it gave up, too...
-
- The UMC chipset has options for bus clock rate as well as I/O recovery
- time (which was set to 4 cycles). I don't know if the latter parameter
- has any relevance with SS24. Setting it to 2 or 8 didn't seem to
- change the SpeedStar's behaviour.
-
- Anyone know if the limitations are due to the throughput of the WD
- chip or is the problem in the bus interface? I have gotten some slow
- I/O cards to work at faster bus speeds by replacing slow bus interface
- chips. My SS has those usual LS-series buffers, but the warranty
- hasn't closed yet...
-
- --
- Segmented Memory Helps Structure Software
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