29 Jun
1999
29 Jun
'99
4:26 a.m.
James Willing <jimw(a)agora.rdrop.com> wrote:
On Tue, 29 Jun 1999, Bill Sudbrink wrote:
Hi
Could this happen if the cable connector was installed upside down?
It looks like what I'd think would happen but I don't have a schematic
handy.
Dwight
So far, all of the power in my IMSAI checks out
OK.
I've brought it up with the MPU-A installed and I
get flashing lights. Press the STOP switch and I
get solid lights. Now the weird part: When I
toggle the address switches and press EXAMINE,
here's what I get on the address lights:
Legend: O - light off
X - light on
- - switch off
^ - switch on
Lights OOOO OOOO OOOO OOOO
Switches ---- ---- ---- ----
Lights OOOO OOOO XOOO OOOO
Switches ---- ---- ---- ---^
etc...etc...etc...
So I think the lights are working. I think
something
is wired strange in the panel? Are there Z80 mods I
should look for?
This frequently indicates that the cable connecting the CPU card to the
front panel is connected or wired improperly.