25 Apr
2014
25 Apr
'14
2:55 p.m.
On 04/25/2014 02:14 PM, Tony Duell wrote:
Not that I know anything about this device...
Sure, I was just naming the likely suspects. But if he has a corrupted
EPROM, I can image mine. The CPU's one of those "super-Z80" chips
(64180, I think), so no problems finding a spare.
The PCB on the thing is big, but it's not rocket science. It could just
be a matter of re-seating some socketed chips.
--Chuck
According to my little guide, if the 1600 LED
isn't lit, this
corresponds to a "Door open" error.
All LEDs on, with Alert blinking says there's a power failure issue.
A lot of devices have all indicators turned on by hardware when the
internal microprocessor is reset (perhaps by having a PIO-type chip
driving TTL buffers that drive the LEDs, so on reset the I/O lins all
become inputs (high impedance), the inputs to te buffers float high, and
the LEDs go on). One of the first thigns the firmware does is initialise
the I/O chips and set the right pattern on the LEDs.