29 Aug
2011
29 Aug
'11
10:41 a.m.
On 28 Aug 2011 at 19:23, Tony Duell wrote:
Do you ahve, or know anybody who has, this P2 versions? The 10L8 has
nofeedback terms, so the bare chip, remvoed from the PCb, must implelenmt
purely combinatorial functions. While I don't think HALs ever had the
fuse map verification circuitry (I've never mananged to find one you can
read out in a PAL programmer0, since it's purely combinatorial you could
try all 1024 combinations of the inputs, record the outputs and do some
kind of logic reduction on the result.
Shouldn't be too hard...
-tony
I don;t have the schematics, but my first guss,
unfortunately, would
be a combinatorial PAL acting as a decoder for some of the address
lines (and manybe other signals).
Pulling the display cover plate off and doing a little circuit
tracing shows that this IC drives various selects and also CAS for
the display DRAM (4x4416).. In fact, it looks as if the HAL10L8 at
position 5G on the P2 revision of the display controller is exactly
the same part. So, without the real thing, it'd be a matter of
trying to synthesize a replacement. Not worth the effort for me.