Apple IIGS: VGC and ROM Upgrade 

Beginning August 1, 1987, two free component upgrades have been available 
to Apple IIGS owners. This REA program ended on 31 March 1995.

Overview
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These are the two component upgrades:

- A new ROM chip corrects minor problems and provides enhancements for 
future software releases.

- A new Video Graphics Controller (VGC) chip corrects video display 
problems that may occur in double hi-res and standard text modes.

Look at the first three digits of the serial number on the bottom of the 
Apple IIGS to determine which of the two upgrades your computer needs.
(This is only a general guide, because a given computer may have already
undergone modifications after leaving the factory. For more specific
information, see the "Upgrade Part Numbers" section later in this article.)
These are the guidelines:

- Computers with the first three digits of the serial number 704
or lower, generally require both the new VGC and the ROM upgrade.

- Computers with the first three digits of the serial number 705
through 724 (inclusive), generally require only the new ROM.

- Computers with the first three digits of the serial number 725 or
higher, generally require neither of the upgrades.

Upgrade Part Numbers
--------------------
Because some systems may have had logic board swaps since date of 
purchase, it's best to check the individual VGC and ROM numbers on 
the main logic board to be sure of which upgrade is required.

- Replace any ROM chip numbered 344-0077-A with the replacement part 
344-OO77-B.

- Replace any VGC chip numbered AMI 344SOO46-1 or AMI 344SOO46-A with 
the replacement part AMI 344SOO46-3, IMP 344SOO46, or IMP 344S0056.

- VGCs numbered AMI 344SOO46-2 or AMI 344SOO46-B need no replacement.

The repair extension program number is 0LR853.

***** IMPORTANT NOTE *****

This program expired on 31 March 1995 and is no longer available under 
an REA program. However, you can purchase the VGC IC and ROM chip as 
separate items. In order to pull the VGC chip off the logic board, you 
will also need the VGC IC extraction tool. Here are the parts you need:

342-0077 ROM, Apple IIGS
344S0046 VGC, Apple IIGS
076-0246 VGC IC Extraction Tool