STB Serial/Parallel Adapter

6FF1.ADF STB Serial/Parallel Adapter

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Based on content by William R. Walsh (original HERE).

STB Serial/Parallel Adapter FCC ID EKS56APS2SERPAR

STB Serial & Parallel Adapter

P1 Parallel port
P2 8-pin serial port
U1 Silicon Logic LD805C (LPT ctrl.?)
U3-U17 PALs
U15 Startech ST16C550P UART
W1 2x2-pin jumper
X1 1.843200 MHz

P2 8-pin serial port - Apple-style? (not verified)
W1 2x2-pin jumper. Set as shown. Function unknown.

STB Systems apparently still had a fascination with their green dots. What are they for?
Ed. Tom: Copper thieving once again?


I finally installed this adapter in a 9585-0X0 running Windows NT 3.1. It configured easily as COM2 and LPT2. The parallel port will handle bidirectional communication if you enable it in system programs. I used the parallel port to print to an HP OfficeJet 9130 from NT 3.1 (the OfficeJet was able to emulate an early LaserJet right out the box, so that's how I got NT 3.1 to print to it.).

I have also run a Costar serial label printer from the COM port. The label printer already had a cable on it for an Apple Macintosh serial port, so using it with this adapter did not require any fiddling around.

Content created and/or provided by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 05 Dec 2023 - Changelog | Legal Info & Contact