English Amiga Board - View Single Post

alexh · 19 September 2010, 23:03

PALs are programmable logic devices. You program them with very basic logic functions chains of AND, OR, XOR etc. etc. written in a high level language.

You will need the contents of the PAL chips. Without that you'll have to reverse engineer their function. You will probably never be able to read them to extract there program as they will have been programmed with the protection bit set (making them effectively write only).

You'll need something like PALASM (Assembler of code for PAL chips) to produce JDEC files and then a PAL programmer like a JTAG device depending on the type of PAL chip.

There is 99.99% NO chance to get the code from these PALs you'll have to either give up, reverse engineer them (not impossible due to their capacity and uber basic boolean functionality) or find the original creator. There is a very, very slim chance they are not protected. Which model are they?

What is it for? For example David Haynie provided the PAL source code for a lot of Commodore parts.

19 September 2010, 23:03	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,400	PALs are programmable logic devices. You program them with very basic logic functions chains of AND, OR, XOR etc. etc. written in a high level language. You will need the contents of the PAL chips. Without that you'll have to reverse engineer their function. You will probably never be able to read them to extract there program as they will have been programmed with the protection bit set (making them effectively write only). You'll need something like PALASM (Assembler of code for PAL chips) to produce JDEC files and then a PAL programmer like a JTAG device depending on the type of PAL chip. There is 99.99% NO chance to get the code from these PALs you'll have to either give up, reverse engineer them (not impossible due to their capacity and uber basic boolean functionality) or find the original creator. There is a very, very slim chance they are not protected. Which model are they? What is it for? For example David Haynie provided the PAL source code for a lot of Commodore parts.