22 Jun
2012
22 Jun
'12
6:54 p.m.
Alexandre Souza - Listas wrote:
I am pretty sure som, if not all, of the logic array chips in my Mac+ are
HALs.
I did it on mine, all pals are protected :o(
If it's a normal production Mac, they're most likely HAL parts rather than PAL, which means that they're mask-programmed
and probably don't
support the readback mode at all. I'd be a little worried that trying
to read a HAL in a PAL programmer might damage the HAL.
My (limited) experience is that attempting to read an MMI HAL as an MMI
PAL does no damage, but you don't get anything useful (it's either all 0s
or all 1s, I forget). It's like reading a copy-protected PAL. Whether it
was possible to order a HAL that could be read out I don't know.
-tony