HP 41C Video interface test. Howto?

[Sylvain Cote]

Part 2, 82163B interface video output ...

As specified previously, the interface has two outputs:
Monitor => for monitor who has composite input (50Hz, 625 lines, 75 ohms)
TV => to be used with the TV antenna adapter

Connecting the 82163 Monitor output to a TV cable input with RCA plug (if such a thing is possible in France) should not work.
Connecting the 82163 Monitor output to a compatible composite monitor input will work.

Antenna adapter example


Connecting the 82163 TV output to a composite monitor input will not work.
Connecting the 82163 TV output to an antenna adapter game/computer input, the antenna adapter to the TV antenna and set TV to channel 3 (or 4) will work.

Test #5: send text to interface and monitor/TV

Code:

Setup: HP-41C, HP-IL module printer activated, 82163 on , monitor or TV attached and properly set
Loop : 41C <IL-cables> 82163 <IL-cables> 41C
ON
FS? 55   // LCD: YES
FS? 21   // LCD: YES
PWRUP    // LCD: nothing expected, will show "TRANSMIT ERR" if loop is broken
"TEST"   // test string
PRA      // LCD: nothing expected, send ALPHA to printer/video, TV/monitor should display TEST on the screen
OFF

If you have done one of the "will work" part and still have the triangles on the screen, then you probably have a hardware problem.

Sylvain