22 Apr
2007
22 Apr
'07
7:40 p.m.
Alexandre Souza wrote:
It is an HP1631D -- 1K deep trace memory, 25 MHz state, 100 MHz timing
modes, two analog channels, no floppy, gpib I/O only. It works OK for
as infrequently as I use it, but if I ever need to do any significant
work with with a logic analyzer, I'm going to get something a bit more
recent. Although I have five pods (of five) I have only four "wire
sets", and most of those are missing a wire or two, so I can't use some
of the channels. Not having an onboard floppy to save setup state is a
pain too.
Such logic analyzers go for $100 on ebay, and less if it doesn't have
lead sets.
consecutive
order, so the data pins would be too. I hooked up a logic
analyzer to the RAMs, booted the system, and waited for the password
prompt. I typed some gibberish and hit return, and the logic analyzer
captured the writes to the RAM. I realized the first read or maybe
first few would be reading directory entries to find the USERID.SYS
file, which is a plain text file containing the login names,
passwords, cp/m user area, and privilege level. However, no matter
what I did, the data didn't make sense.
What LA did you use, Jim?
Greetings from Brazil,
Alexandre