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MISCELLANEOUS
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MISC.06.IWM.txt
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Apple II
Technical Notes
_____________________________________________________________________________
Developer Technical Support
Apple II Miscellaneous
#6: IWM Port Description
Revised by: Glenn A. Baxter November 1988
Written by: Cameron Birse February 1986
This Technical Note documents the IWM port pin assignments on various
machines.
_____________________________________________________________________________
Apple IIGS Disk Port Pin Assignments
Signal Name Disk Port Pins (DB-19)
Phase 0 11
Phase 1 12
Phase 2 13
Phase 3 14
/WReq 15
Dr1 17
Rd 18
Wr 19
Wrt Prot 10
Dr2 9
HeadSel 16
Gnd 1,2,3
3.5Disk 4
-12v 5
+5v 6
+12v 7,8
Apple IIe UniDisk 3.5 Controller Disk Port Pin Assignments
Signal Name Disk Port Pins (DB-19)
Phase 0 11
Phase 1 12
Phase 2 13
Phase 3 14
/WrtReqII 15
/HstEnbl 17
Rd 18
Wr 19
Wrt Prot 10
No Connection 9,16
Gnd 1,2,3,4
-12v 5
+5v 6
+12v 7,8
Apple IIc Disk Port Pin Assignments
Signal Name Disk Port Pins (DB-19)
Phase 0 11
Phase 1 12
Phase 2 13
Phase 3 14
/WrtReq 15
/Enbl 2 17
Rd 18
Wr 19
Wrt Prot 10
No Connection 16
Gnd 1,2,3,4
-12v 5
+5v 6
+12v 7,8
External Interrupt 9
Note: On the Apple IIc Plus,
the disk port pins are driven
by a custom ASIC instead of by
the IWM chip.
Macintosh Disk Port Pin Assignments
Signal Name Disk Port Pins (DB-19)
Phase 0 11
Phase 1 12
Phase 2 13
Phase 3 14
/WrtReq 15
/Enbl 2 17
Rd 18
Wr 19
PWM 10
HdSel 16
GND 1,2,3,4
-12v 5
+5v 6
+12v 7,8