Re: SCSI-card id? What is it? Help to id.

[Wayne Stewart <waynes@intergate.bc.ca>]

Juho Antonio Wahlroos wrote:

>
>
> The firmware chip has s/n 341-0437-A and C.Apple'87. Apple Computer has
> manufactured the card and it was made in Singapore.
>
> Any ideas? Especially on how to select the id. from a J1, which has 8
> (eight) jumpers and by default the last jumper is closed (i.e. ON).
>
> Is it the same electronics as Apple High Speed SCSI card?
> Is it capable to handle the same electronics as RamFast?
> Can it handle a SCSI HD as large as 300Mb?
>

Your card has the same part # on the eprom as my Rev C so that's what itlikely
is. A lot of cards that were origionally rev A or B were upgraded
to Rev C. You'd be best leaving the jumper on J1 at pin 8.  TheSCSI id of
your devices is set at the individual devices. Either by a pinwheel or with
jumper blocks.

The electronics are a bit different on the High Speed SCSI card. The HS
can handle removable media better. It also does DMA, which speeds it
up slightly although I generally can't tell the difference without a
stopwatch. One advantage of the Rev C over the HS SCSI is that if you
have no SCSI devices powered up you computer will ignore the card and
boot off the next slot. Generally I prefer the Rev C over the HS SCSI
and rarely take them out of their boxes.

The Ramfast is a bit different. It's a lot faster than the Apple SCSI cards.
The Rev C should handle the same devices. Two things to keep in mind
though. Rev c does poorly with removable media. Some devices require
termination power which  you'd have to modify the Rev C to provide.

A 300 meg drive shouldn't be a problem in itself but you'll need different
SCSI utilities to set it up. The Utilities that came with your card only handle
4- 32 meg partitions. The largest hard drive I've personally hooked up to
a Rev C is 700 meg, with the last partition being HFS. If you're
not running system 6 on a IIgs you're more restricted in size, not being
able to use HFS.

Hope this helps
            Wayne