Strange... Please double-check all connections.
You did remove the jumper previously used for firing up the PSU, right? Click here for the
IIci's PSU pinout -- it's the same as the IIvx, Q800 etc.
Also, make sure that the
metallic enclosure of the transistor isn't touching any other contact -- some models have the enclosure connected to the
collector. If it's in contact with Ground, will likely show the symptom you describe ("always on"). Ditto if the
power button on the IIci is at the "locked" position...
If all of the above fails, you may try to disconnect the end of the 10K resistor from the /PFW line, and connect it temporarily to GND -- PSU should stay OFF all the time. And if you connect that resistor to the violet cable, PSU should go ON -- as long as the
hard power switch you installed is ON, of course
@Trash80toHP_Mini: I haven't though about the PS/2 translating microcontroller because it's a bit beyond my capabilities... and all my compacts use ADB anyway. The problem is not the schematic, but
programming it 8-o
The compact's video is 60 Hz
vertical too... Level switching between TTL and VGA is certainly the easy part here, but the
horizontal frequency is 22.254 kHz, way below most multi-sync monitors would accept -- they usually go from about 31 kHz and up, covering at least
basic 640x480 VGA (31.5 kHz).
However, back in the day there
was at least one monitor capable of displaying these frequencies and some "modern" video modes: the
NEC MultiSync 3D, if memory serves, accepted
15-38 kHz -- from CGA to early "super"-VGA, with things like EGA or even
Macintosh 13" (67 Hz) in the middle. But they seem
very hard to get now :'(
Anyway, if modern technology is allowed
there are nowadays some relatively cheap
scan converters which take a CGA or EGA signal and output a regular VGA one -- basically they digitize the input signal into some sort of VRAM, which in turn is displayed at VGA rate. Not sure, though, if they'll accept the
slight difference on horizontal frequency from EGA (the closest one). According to
this page, the "official" range is 23.5-25.5 kHz, thus unsuitable for compacts (but OK for
12" RGB). Maybe with some tweaking...