On 01/27/2018 02:43 PM, Jules Richardson via cctalk wrote:
Well, there's someone's hand-written sticker on the top
saying it's a lowly RD51 - however the actual p/n sticker
says it's an RD53-A and the defect table lists it as
ST506, 85MB.
Of course it probably doesn't work anyway ;-)
The likelihood of a 30+ year old MFM hard drive working is
pretty small. If it DOES work, get the data off it as soon
as possible, the grease in the bearings are likely to have
turned into gunk and it won't last.
If you start with just the M7606 - CPU and the M7608 -
4MB ram once
you get a console cable built it shouldn't be too hard to
get some
basic signs of life.
Yes, that's where I'm at right now...
Console default is 8 data bits, 1 stop bit and no parity
(at whatever speed the switch is set to), correct?
I'm getting an alternating F and 9 on the hex LED diag
display on the console panel, no output at all on my
terminal, and the M7606 starts with 4 solid red LEDs, then
a solid green, then the middle pair of the red LEDs start
a simultaneous slow flash on/off (while the outer two plus
the green remain steady)
MM, that doesn't sound good at all. The single LED on the
console panel is supposed to count down from F as it runs
through the on-board diags. It is supposed to send a 2-line
(I think) description of the board rev level and ROM
firmware level, and then do something like this:
F.....E.....D.....C....B.....A.....9.....8....7 (this is
the memory test, and can take a LONG time) and then continue,
finally leaving you with a console prompt or a boot or boot
failure message.
Jon
