Re: Blank CMS SCSI Card PCBs

[david@uow.edu.au (David Wilson)]

>"Rich Beaudry" <r_beaudry@hotmail.com> wrote in message
>6fe0711e.0203251309.7e2861b9@posting.google.com">news:6fe0711e.0203251309.7e2861b9@posting.google.com...
>> I just won on eBay a lot of blank CMS SCSI cards for the Apple 2. They
>> appear to be production circuit boards, silkscreened, plated, traces
>> run, etc., but NO parts or connectors installed.  The following link
>> to eBay gets you there, with a picture of the boards:
>>
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2006140386

Looks the same PCB as my populated card has. Same blank REV and S/N boxes.

>> I suspect that there is a ROM on board, and some long-obsolete SCSI
>> controller chip on board as well, so I hold little hope, but I'd like
>> to turn one or more of these into functional cards.  With that goal in
>> mind, here are some questions:
>>
>> - Does anyone have a ROM that they could make me a HEX dump of?  I
>> have no idea what revision board this is, unfortunately...

I have a few newer ROM images and a 1987 ROM on mine.

>> - Can someone help me ID the board revision from part placement, etc.?

I don't think there were multiple board revs, just ROM revs.

>> - Would anyone be willing to take detailed digital pictures of their
>> board and send them to me, so I can try to re-create it?

Here is a parts list from mine:

U1-4,6,7	74HCT240	octal buffer
U5		D4016-2		(NMOS 2KB static RAM, 6116 is CMOS version)
U8		74LS133		13 input NAND gate
U9,14,16	PAL16L8-25	marked A3, A1 and A2 respectively
U10		2764		8KB EPROM
U11		74HCT175	quad D-type FF
U12		74LS74A		dual D-type FF
U13		74LS14		hex schmitt inverter
U15		74HCT245	octal bi-directional buffer
U17		NCR 5380	SCSI controller chip
C1-21		0.1uF		bypass caps
C22,23		22uF 16V	electrolytic caps
R1		3k9 5%		resistor
R2		1k0 5%		resistor
RP1-6		A472GA		4k7 resistor packs
RP7-9		8Z221/331G	220/330 ohm SCSI terminator resistors
CR1		not present	Term power diode

Now all we need to do is work out the programming of the PAL chips.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia