Mac IIvx and Mac IIvi
also Performa 600
The Mac IIvx and IIvi were odd ducks, running a 16 MHz motherboard when all of Apple's older machines were faster than that.
Like the IIsi and LC, these models had memory soldered to the motherboard. In this case, 4 MB.
Looking at the motherboard with the connectors to the rear, you will see four SIMM sockets in the front center of the board. They may already have memory in them.
The IIsi supports 256 KB, 1 MB, 2 MB, 4 MB, and 16 MB SIMMs, leaving several upgrade options. With Bank A soldered in place, there is only one place to install memory.
The IIvx and IIvi uses 30-pin SIMMs rated at 80ns or faster.
A 5 MB configuration has four 256 KB SIMMs.
An 8 MB setup uses four 1 MB SIMMs.
A 12 MB configuration requires four 2 MB SIMMs.
For 20 MB, install four 4 MB SIMMs.
For 68 MB, install four 16 MB SIMMs.
After installing memory and reconnecting your drives, boot your Mac with extensions off (hold down the shift key) and check "About This Macintosh" under the Apple menu. If it doesn't give the expected number, you should reseat your memory.
Once you know the upgrade is a success, pop on the lid and enjoy the extra memory. I suggest you increase the size of the disk cache for better performance.
VRAM
The IIvx and IIvi have two VRAM sockets, which are normally filled with two 256 KB VRAM SIMMs. To upgrade to 1 MB VRAM, these would be replaced with 512 KB VRAM SIMMs.
<go to Macintosh
Memory Guide, Mac
IIvx, or Mac
IIvi page>
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