Re: Freakin' Second Sight Board

[Paul Schultz <pschultz@med.wayne.edu>]

rubywand@aol.com (RUBYWAND) wrote:
>In article <Pine.SUN.3.91.951224100837.12985A-100000@moose>, Paul Schultz
><pschultz@med.wayne.edu> writes:
>
>>
>>If you can't get it to work even with ONLY the memory card and SCSI card,
>>try to remove the SCSI card and boot from floppy and see if that works.
>>Crazy as it may sound, I can boot if I don't have either my ZipGS or my
>>RamFAST installed. Together, these cards have caused my SS to display the
>>same symptoms you have described.
>>
>>
>    It does not sound crazy.
>
>    When a Zip-GS 10/64 was swapped-in for a '9/32, similar problems
>cropped up on our IIgs. The cure was a power supply fix-- not a new,
>"heavy duty" power supply.
>
>    Mainly, there are two problems:  (1) Noise on the +5V line and,
>perhaps, on the +12V line; and,   (2) The voltages getting to the cards in
>the slots is too low. The cure is to fatten-up the +5V, +12V, and Ground
>leads running from the power supply to the connector-- swap-in #14 gauge
>or #12 gauge stranded copper leads-- and, probably, on the under side of
>the motherboard, run #18 gauge leads from the power supply connector +5V
>and +12V points to the corresponding points on Slots 3 and 7. 
>

Could you please explain how adding a thicker wire will decrease noise on
the +5V and +12V lines?  I received and installed my new power supply and
had the same results with my SS....it locks up the computer on boot-up and
puts garbage on the frozen screen.

Interestingly, (and something I forgot to mention previously) when I have
my SS installed and connected to my VGA monitor _AND_ my GS-RGB monitor
connected to my GS internal video port, I GET THE SAME GARBAGE ON BOTH
SCREENS!!! This indicates that something is fundamentally going wrong with
the video circuitry prior to the SS grabbing it and performing its magic.

Any ideas?

Paul Schultz