Re: Need Apple II SCSI card jumper info

[Rubywand <rubywand@swbell.net>]

John Schreiber writes ...
> 
> I purchased a Apple II SCSI controller and noticed that it has 8 pairs of jumpers at J1. Can
> anyone tell me if any of these should be capped? None are currently jumpered. The function of
> these jumper pins would be appreciated. I do not have the controllers manual.
> 
> Thanks,
> 
> John


     Steve Buggie suggests that you may have the CMS SCSI controller
card. If you do, the following snip from the FAQs should help ...


>>

From: Jack Countryman IAC

013- I want to configure a CMS hard drive controller card to run a
     20 meg drive for a //e. Could someone supply info on settings?

     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.

<<



Rubywand