Micro Channel Bus / Connector Layout (2x89-pin)
Pin B1-A1 / B60-A60 = 16-bit MCA bus
Pin B1-A1 / B89-A89 = 32-bit MCA bus
Pin
Signal Name
Pin
Signal Name
B01
AUDIO GND
A01
-CD SETUP
B02
AUDIO
A02
MADE 24
B03
GND
A03
GND
B04
14.3 MHz OSZ
A04
A11
B05
GND
A05
A10
B06
A23
A06
A09
B07
A22
A07
+5 Vdc
B08
A21
A08
A08
B09
GND
A09
A07
B10
A20
A10
A06
B11
A19
A11
+5 Vdc
B12
A18
A12
A05
B13
GND
A13
A04
B14
A17
A14
A03
B15
A16
A15
+5 Vdc
B16
A15
A16
A02
B17
GND
A17
A01
B18
A14
A18
A00
B19
A13
A19
+12 Vdc
B20
A12
A20
-ADL
B21
GND
A21
-PREEMPT
B22
-IRQ 09
A22
-BURST
B23
-IRQ 03
A23
-12 Vdc
B24
-IRQ 04
A24
ARB 00
B25
GND
A25
-ARB 01
B26
-IRQ 05
A26
ARB 02
B27
-IRQ 06
A27
-12 Vdc
B28
-IRQ 07
A28
ARB 03
B29
GND
A29
ARB/-GNT
B30
-DPAREN
A30
-TC
B31
DPAR(0)
A31
+5 Vdc
B32
-CHCK
A32
-SO
B33
GND
A33
-S1
B34
-CMD
A34
M/-IO
B35
CHRDYRTN
A35
+12 Vdc
B36
-CD SFD
A36
CD CHRDY
B37
GND
A37
D 0
B38
D 01
A38
D 02
B39
D 03
A39
+5 Vdc
B40
D 04
A40
D 05
B41
GND
A41
D 06
B42
CHRESET
A42
D 07
B43
-SD STROBE
A43
GND
B44
-SDR (0)
A44
-DS 16 RTN
B45
GND
A45
-REFRESH
B46
- key -
A46
- key -
B47
- key -
A47
- key -
B48
D 08
A48
+5 Vdc
B49
D 09
A49
D 10
B50
GND
A50
D 11
B51
D 12
A51
D 13
B52
D 14
A52
+12 Vdc
B53
D 15
A53
DPAR(1)
B54
GND
A54
-SBHE
B55
-IRQ 10
A55
-CD DS 16
B56
-IRQ 11
A56
+5 Vdc
B57
-IRQ 12
A57
-IRQ 14
B58
GND
A58
-IRQ 15
B59
reserved
A59
reserved
B60
reserved
A60
reserved
Pin
32-bit bus
Signal NamePin
32-bit bus
Signal Name
B61
-SDR(1)
A61
GND
B62
-MSDR
A62
reserved
B63
GND
A63
reserved
B64
D 16
A64
-SFDBKRTN
B65
D 17
A65
+12 Vdc
B66
D 18
A66
D 19
B67
GND
A67
D 20
B68
D 22
A68
D 21
B69
D 23
A69
+5 Vdc
B70
DPAR(2)
A70
D 24
B71
GND
A71
D 25
B72
D 27
A72
D 26
B73
D 28
A73
+5 Vdc
B74
D 29
A74
D 30
B75
GND
A75
D 31
B76
-BE 0
A76
DPAR(3)
B77
-BE 1
A77
+12 Vdc
B78
-BE 2
A78
-BE 3
B79
GND
A79
-DS 32 RTN
B80
TR 32
A80
-CD DS 32
B81
A 24
A81
+5 Vdc
B82
A 25
A82
A 26
B83
GND
A83
A 27
B84
A 29
A84
A 28
B85
A 30
A85
+5 Vdc
B86
A 31
A86
-APAREN
B87
GND
A87
-APAR(0)
B88
APAR(2)
A88
-APAR(1)
B89
APAR(3)
A89
GND
MCA memory-matched extensions - pin AM1-BM1 / pin AM4-BM4
Pin
Signal Name
Pin
Signal Name
BM4
Ground
AM4
Reserved
BM3
Reserved
AM3
-MMC_CMD
BM2
-MMCR
AM2
Ground
BM1
Reserved
AM1
-MMC
MCA AVEC Auxiliary Video Extension Connector - pin BV1-AV1 / pin BV10-BV10
Pin
Signal Name
Pin
Signal Name
BV10
ESYNC
AV10
VSYNC
BV9
Ground
AV9
HSYNC
BV8
P5
AV8
BLSNK
BV7
P4
AV7
Ground
BV6
P3
AV6
P6
BV5
Ground
AV5
EDCLK
BV4
P2
AV4
DCLK
BV3
P1
AV3
Ground
BV2
P0
AV2
P7
BV1
Ground
AV1
EVIDEO
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.