Remove solder blob from JP7A and clean with IPA
Remove solder blob and clean JP3. Connecting pins horizontally -> =
JP2 remove solder from center and top then connect center and bottom.
Remove solder blobs from where MC74F139N IC is going to be mounted later on in socket U32
Also remove solder from pins on socket U32
Remove solder from pins in sockets U16, U17, U18 and U19
Solder sockets to U16,U17,U18,U19 and U32
Add memory chips and 74F139 chip in to their sockets.
With added 1MB memory card to expansion slot total graphics memory adds up to 2MB
In picture there is additional 4MB other memory from GVP A500-HD+