PCB I.D.

Long Hair

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I decided to organize my Arcade clutter. I have a few pcb's that I'm not sure what they are, but I'm mainly curious about this board. Maybe someone can id it, and explain what or why they modified it so heavily. The board is from 1979, and the info on the board is PC-P-86V-0. On the back all I seen was PC. Thanks Long Hair.
 

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https://osiweb.org/I believe I found info on this board. I searched for OSI 555 and found this page . The description is ( "Jungle Board" multi-function RAM+I/O board. I believe this was designed for the C3 multi-user and CPM systems. It contains 8K RAM in two blocks, 4 Serial ports, a "Network Node Interface" for multi-user systems, Centronics and NEC-wordprocessor compatible parallel interfaces. ) They have a pic of the board unpopulated and it looks right. I believe this pcb was with some GORF pcb's and other wiring harnesses I picked up at a auction a long time ago.
 
I can see one 1488, which is used for serial, and the 2114 RAM are easy to see in the middle. Interesting board.

Scott C.
 
I can see one 1488, which is used for serial, and the 2114 RAM are easy to see in the middle. Interesting board.

Scott C.
1488s are just level converters -- not necessarily anything to do with RS232.

The (multiple) 6850s are serial UARTs (which then use 1488 / 1489 to translate to/from RS232 levels from TTL).
 
1488s are just level converters -- not necessarily anything to do with RS232.

The (multiple) 6850s are serial UARTs (which then use 1488 / 1489 to translate to/from RS232 levels from TTL).
Thanks for the correction, as I said that poorly. I'm used to seeing the 1488/1489 sitting in close proximity to the 16450 and 16550 UARTs on PC serial cards from BITD.

Scott C.
 
Thanks for the correction, as I said that poorly. I'm used to seeing the 1488/1489 sitting in close proximity to the 16450 and 16550 UARTs on PC serial cards from BITD.

Scott C.

Yep... those got used a lot before the MAX232 came out with the integrated charge pump :)
 
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