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Tube Time on šŸŸ¦ā˜ Profile picture
Tube Time on šŸŸ¦ā˜
@TubeTimeUS
vintage computers, tubes, the MOnSter6502, cross-sectioned electronic parts. coauthor of https://t.co/lquWXu6v7m. āš  please read https://t.co/PrGDtiV6c5

Sep 16, 2021, 7 tweets

this ISA card is not what it seems! šŸ§µ

oh, but it's just a SCSI card with onboard cache SIMMs and an activity LED, you say.

does this look like a SCSI connector to you? it's got 78 pins.

these aren't RAM chips on the SIMMs.

and these aren't chips you'd find in any SCSI card. these are dual UART chips. yes, this board has eight serial ports.

they're not RS232, they're RS485. it uses differential signaling so it can be transmitted over longer distances, and it's multi-drop so multiple devices can share the same wires.

šŸ‡ØšŸ‡¦

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