Re: RAMFast D problems

["Bill Garber" <willy46pa@comcast.net>]

"Mitchell Spector" <mitch2gs@hotmail.com> wrote in message kvbb64liqn7rh8m4klbll7u9chr5fd4e70@4ax.com">news:kvbb64liqn7rh8m4klbll7u9chr5fd4e70@4ax.com...
> Rich <nospam@saddam.net> wrote:
> 
> >I picked up a RAMFast D on Ebay (in addition to the one I already have).
> >
> >It appears to be non-functional.  IIGS won't boot with it plugged into 
> >the system (even with no SCSI drive).  I get a few low-res blocks of 
> >color on the screen.  Remove the RAMFast and the IIGS is back to normal.
> 
>     I too have a dead RamFAST rev.D board, but it is just completely 
> ignored by the IIgs as if no card is present. I tried replacing the ROM
> and the DRAMs (the only socketed parts) but it didn't help. The only
> thing I could think of at the time, is one of the 74LSxxx parts having
> blown (I resurrected an AE Phasor card that wasn't recognized that
> way!) which I think Tony suggested in his post.


This RAMFast totally wrecked the display, and wouldn't allow anything 
else to work. Being almost all SMD parts, which I try not to mess with, 
I passed this card along to Henry. 

Usually, a shorted part, or series of parts will exhibit this behaviour, 
while a blown part, etc....will allow the rest of the system to operate. 

As far as flipping the cable, nothing will happen, unless you have it 
plugged into a drive and have it powered up, in which case you'll 
most likely blow the drive, as well, being that you'll have all the 
ground lines swapped with the data and address lines. 

Bill Garber from GS-Electronics
http://www.garberstreet.com