22 Jul
2012
22 Jul
'12
12:26 p.m.
I certainyl did test the bare PSU on its own, that may
include the
regualtors for the comptuer section. I also seem to rememebr that many,
if not all, of the ICs on the terminal board were socketed, so I pulled
those, at least the hard-to-find or expensive ones, and powered up at
litte as I could co check votlages.
I'm afraid I broke my own rule again and just plugged in the H89 to see what would
happen. Fortunately, nothing dramatic happened. The display came up with the text rolling
but it stabilized as it warmed up. I ended up with an incrementing clock in the lower
right corner and a cursor in the upper left. If I put it in local mode I can type on the
keyboard and see the correct characters appear on the monitor so the terminal board seems
to work. I don't have a boot floppy so I can't get much further.