IMSAI 8080 (our show so far...)

From: Dwight Elvey <elvey_at_hal.com>
Date: Tue Jun 29 11:26:53 1999

James Willing <jimw_at_agora.rdrop.com> wrote:
> On Tue, 29 Jun 1999, Bill Sudbrink wrote:
>
> > 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.


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
Received on Tue Jun 29 1999 - 11:26:53 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:32:17 BST