First pictures of the inside of a Mac Plus HAL

[al kossow]

bitsavers (@bitsavers@oldbytes.space)

Attached: 3 images First pictures of the inside of a Mac Plus 341-0514-A 16R8 HAL taken by Travis Goodspeed The green marks point to the chip connections that replace the programmed fuses of a PAL This may be the first time anyone has taken a picture of a HAL "HAL - Hard Array Logic The HAL...

oldbytes.space

 

[al kossow]

some progress

bitsavers (@bitsavers@oldbytes.space)

Some progress on reverse engineering mac plus PALs Travis has decapped and read the bits out of the 341-0522-A It wasn't at all what I expected. It is a work-alike 24 pin part bonded out to 20. The array is much more complicated than the simple fuse-link parts. Investigations continue. Trying to...

oldbytes.space