shawnd@chinook.ee.ubc.ca (Shawn Day) (11/01/90)
Hello: I would like to use the SCSI port on a Sun/360 to output 8-bit digital data (sort of like a Centronics printer port). Can anybody give me some ideas on the easiest way to do this? The device will be the only one on the SCSI bus, so it would be nice if I could somehow avoid all of the bus arbitration complexities. Is there a chip available that can perform this task? Shawn. Shawn Day (604) 264-0024 #104-8777 Hudson Street shawnd@fs1.ee.ubc.ca Vancouver, British Columbia ...!ubc-cs!fs1.ee.ubc.ca!shawnd Canada V6P 6H2
whit@milton.u.washington.edu (John Whitmore) (11/04/90)
In article <1430@fs1.ee.ubc.ca> shawnd@chinook.ee.ubc.ca (Shawn Day) writes: >Hello: > >I would like to use the SCSI port on a Sun/360 to output 8-bit >digital data (sort of like a Centronics printer port). >Can anybody give me some ideas on the easiest way to do this? >The device will be the only one on the SCSI bus If your host Sun can be told to do programmed SCSI accesses (single accesses, NOT complex operations like 'write to disk#6'), then there's an article in _Circuit Cellar Ink_ for April/May 1990 that has the information you need (mainly; you'll need to figure out the Centronics handshake). Their output-only example takes seven chips, has eight data and eight address bits output (you would use the address bits for miscellaneous control lines). Detecting error conditions on the Centronics port might be harder. Don't let the printer run low on paper! Back issues can be ordered from CCI; Circuit Cellar INK - Back Issues Sales 4 Park Street Vernon, CT 06066 (203) 875-2199 and they take Visa/MC/check; I think it's $4 per issue. John Whitmore