“SWIM disk controller (“Sander-Wozniak Integrated Machine”, not “Super-Wozniak Integrated Machine” as reported!)” [apple1notes]

“SWIM (Sander/Woz Integrated Machine) - IWM with significant additional capabilities for MFM disks. 100% back-compatible with the IWM (actually contains 2 complete controllers: an original IWM and the new MFM-capable Integrated Sander Machine, or ISM. A crossbar switch inside the chip determines which of the cores is connected to the inputs and outputs). Even in MFM and 1.44M modes, requires the CPU to do all the low-level timing-intensive work of disk I/O, just like the original Disk II.” [mess]

seems to be a number of SWIM varients, this was evidently first gen:

• 343S0061-A (Apple ][ 3.5“ Disk Controller ) [Apple ASICs]
• 343S0137 (SWIM III ) [mess]
• 344S0061-A (SWIM) [mess]
• 344S0607-A (UART/MMU/SWIM (Plus Only)) [Apple ASICs]
• 344S1029 (SWIM, Mac Portable) [mess]

PCB

Package

VLSI
9027BV 145401
VC2982-0002
344S0061-A
(M)(C)APPLE 88

Die

(M) (C) APPLE 1987
VC2982
EAB

Map

References