The Macintosh IIfx requires SIMMs that conform to the following
specifications:
- 1 or 4MB capacity--256KB SIMMs are not supported.
- 64-pin (for separate Read and Write lines) versus 32-pin for other
Macintoshes. The LaserWriter IINTX uses similar, but slower, 64-pin
SIMMs. Macintosh IIfx SIMMs will work in a LaserWriter IINTX, but
LaserWriter IINTX SIMMs are too slow for the Macintosh IIfx.
- Fast Page Mode support, like the Macintosh IIci.
- 80ns or faster.