Apple IIe HAL chip

[phogren]

Can the IIe HAL chip be copied and put on a GAL chip?

 

[amauget]

I don't have the answer to your question.
But you can find all the insights of the Apple //e HAL in the Understanding the Apple IIe book at page 3-20.
It shows the logic equations so you can probably adapt them to a GAL IC.

Good luck,

 

[dave_m]

Can the IIe HAL chip be copied and put on a GAL chip?

From the referenced book, it looks like the HAL16L8 equations should be able to be fit into a GAL16V8 or PAL16V8 which are still available, and be a fit and form functional replacement.

However the book notes that the equations are for the REV B Apple IIe. The equations would not work in a REV A system, but the differences are noted.

To keep the timing close to the original part, a -15 part should be used for a max delay of 15 nS. Don't get one that is too slow or more likely too fast.

 

[tomeucapo]

Hello

I had same issue my HAL is dead and try to find if is possible replace HAL-PAL with GAL16V8 or ATF16V8C (From Atmel).
I found JEDEC files on: http://www.downloads.reactivemicro.com/Apple II Items/ROM_and_JEDEC/IIe/TMG_Unit_aka_HAL/
But I'm not sure it works on my Apple IIe replace HAL to GAL. Finally you workarround works?

Thanks

 

[tomeucapo]

Hello again

Finally can program old AMD PALCE16V8 using JEDEC from url and works great on Apple IIe as HAL replacement, but use GAL16V8 JEDEC file. Because other JEDEC is for 16R8 PAL.

Cheers!