🚀 go-pugleaf

pc532@bungi.com writes:
 > We can at last have some Ethernet 32GX32 PCBs for our PC532s !
 > So let's start planning ...
 > 
 > To Be Determined:
 > 	- Who definitely wants a PCB ?
 > 		So far:		stacey@guug.de,  jjsmith@nyx.cs.du.edu,
 > 				mch@regent.e-technik.tu-muenchen.de
 > 		Presumably: George Scolaro (the designer, gs@chips.com !) )
 > 		Who else ?
 > 	- Who probably will, subject to various IFs..

I used to be a definite. But now I am planning to use a Sun 3/50 (which
I can also run mach on) as a graphics card/ethernet connection.

Now I am am a "proabably will, subject to various IFs". Principally,
if it is cheap enough. I would be rather interested in using it for
multi-processor mach. (Which probably means putting a 532 instead of a
GX32 in there).

 > 	  I tend to favour a Single run, opinions welcomed,

Well, the double run would be nice (in terms of the final product
being bug free) but I suspect with our numbers, it won't be very
feasible.

 > Some specs for the et532 follow (for those that don't keep copies of past
 > history):
 > 
 > 	20MHz 32gx32, no FPU.
 > 	1M/4M DRAM (256kx4 or 1mx4) 100ns or faster, fast page mode.
 > 		same performance as pc532 (except at 20MHz, i.e. 40Mbytes/sec)

Presumably, 25MHz is possible if the same speed parts are used as in the
PC532?

 > 	Ethernet, thin (cheapernet) and thick (DB15 connector) NS chipset
 > 	SCSI, DP8490 (via 62pin edge connector and 50 pin SCSI connector)

Experience with writing drivers for the dp8490 leads me to suggest that
a counter to count DRQ's would be a really good idea. 8 bits would be
enough to be useful. Since we should have control of the software
at both ends, the absence of such a counter is less of a problem.


Ian