26 Jul
2012
26 Jul
'12
3:54 p.m.
On Thursday (07/26/2012 at 08:10PM +0100), Tony Duell wrote:
In this case, the board is not in system and is in pretty bad shape from
the mouse abuse so I'm OK with taking them off the board. I think
that's a shorter path in this situation.
or maybe that disassembler for the 2900 you wrote? :-)
Chris
--
Chris Elmquist
These are not socketed so will need to be desoldered and then fed into a
programmer/reader. It looks like my DataIO System 19 will do 24S41/74S476
so I think I can read them there.
I read them without desoldering, but it was a pain. If you look at the
printset, you'll see the OE/ line of the seqeuncers is connected to an
inverter, the input of which is pulled high. So if you pull that input
low, the sequencers outputs are disabled and stop driving the ROM address
pins. So did that, then put a test clip on each ROM i turn, sequenced
the address pins and captured the data. If I desolder
these and read them, do we really have use for the bits?
I really should still have sump of them around here somewhere...