There's no question that Apple could have modded the Plus one more time to improve SCSI performance and compliance. That they chose not to is very telling, and H3NRY's supposition …
Oops! didnt read it right. its a 32meg chip!
EDIT: My ram SIMM has 16 Micron Technology Inc. Dram 5volt CMOS 4Megx4 2K refresh Fast Page Type Behuizing 60ns chips!