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From: jcountry@IDEANET.DOE.STATE.IN.US (Jack Countryman IAC)
Newsgroups: comp.sys.apple2
Subject: Re: CMS card and write protect
Message-ID: <Pine.3.85.9407120131.A25312-0100000@ideanet.doe.state.in.us>
Date: 12 Jul 94 05:46:31 GMT
References: <2vkoda$e0r@scipio.cyberstore.ca>
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On 8 Jul 1994, John Blaby wrote:
> This info is needed for a friend.
>
> She has a CMS hard drive controller and wants to configure it to run a
> 20 meg drive for a //e. She has no documentation whatsoever. Can
> anyone help out with jumper settings and any other pertinant
> information?
>
> Thanks in advance..
> John
According to the CMS manual, page D3, the six sets of eight pairs of jumpers
(u1....u6) are for the following purpose:
______________________________________________________________________
/ |
/ u 1 u 2 u 3 u 4 j2 |
/ |
/ |
| |
| |
| |
| |
| |
| u 5 u 6 |
|___________________________________________ j1 |
| |
|_____________________________|
u 1: Boot Scan delay....manual shows no jumpers here in default
configuration
u 2: first (left) jumper is 'Enable I.C.P. (Yes/No)', middle 6 not used,
last (right) is 'multiple initiators (Yes/No)'...manual shows no jumpers
in default configuration
u 3: Selection phase time out delay....I believe this sets how long the
card waits for the drive to come up to speed(?)...manual shows the
default as having 4, 5, and 7 with jumpers installed
u 4: Arbitration phase time out delay....manual shows default as no
jumpers installed
u 5: Bus Free phase time out delay...manual shows default as jumper on
number 1
u 6: Interrupt recovery delay....manual shows jumpers on 3, 4, and 5
j1 and j2 are single sets of pins....the manual says J2 is not used, but
J1 is to be jumpered.
.........................................................................
The card I have here, came out of a IIGS where it was hooked to first a
twenty meg CMS drive, and later a forty meg CMS drive. It has the following
jumpers set:
u1: jumper on 7
u2: no jumpers
u3: jumpers on 4, 5, and 7
u4: no jumpers
u5: jumper on 1
u6: jumpers on 3, 4, and 5
j2: no jumper
j1: jumper
As I recall, this setup yeilded a rather long pause for the hard disk to
come up to speed (about 40 to 45 seconds) that we found necessary at the
time to avoid boot problems.
Good luck....