How to upgrade AppleIISd V1.0 to V1.1

I needed to change a minor detail in hardware design to make the card work and I was happy to hear that some of you folks have made their own PCBs from my design.

Here are the changes that are needed to make the current ROM and CPLD work with a V1.0 card:

On the front: Remove resistor R10 and make a connection between the left pad and pin 13 (A11)


On the back: Cut the trace between pin 30 (/IRQ) and the via.


Comments

Popular posts from this blog

How to prepare SD cards for the AppleIISd

Prebuilt AppleIISD V1.2.1 finally available

Prototypes for the new AppleIISd hardware V1.2