72
12 SD+(12) 26 Ground 39 LOBUFDIR
13 SD+(9) 27 ISA BCLK 40 HIBUFDIR
14 SD+(8)
J29, MCBL106A, Floppy
Pin
Signal Pin Signal Pin Signal
2 RPM 14 DRV0- 26 TRK0-
4 No connect 16 MTR1- 28 WRPRT-
6 DRATE0 18 DIR 30 RDATA-
8 INDEX- 20 STEP- 32 HDSEL
10 MTR0- 22 WDATA- 34 DSKCHG
12 DRV1- 24 WGATE-
NOTE All odd-numbered pins of J29 are connected to ground, except pin 29 (MID 1) and pin 33 (MID0).
J30, MCBLW660, Speaker
Pin
Signal Color
1 + 5.1 V Red
2 Ground White
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