B-10 Pin Assignments
EXPANSION PORT PIN ASSIGNMENTS (CONT’D)
Pin Signal Pin Signal
55 Mouse Clock 84 FD – Direction In
56 Mouse Data 85 FD – Boot Select
57 Keyboard Clock 86 FD – Low Density
58 Keyboard Data 87 FD – Write Enable
59 N.C. 88 FD – Step
60 +12 V sys 89 LA23
61 FD – TRACK0 90 LA22
62 +12 V sys 91 LA21
63 +12 V sys 92 LA20
64 +12 V sys 93 LA19
65 +12 V sys 94 LA18
66 +12 V sys 95 LA17
67 CRT – red 96 FD – Write Protect
68 CRT – green 97 FD – Disk Change
69 SA17 98 FD – Read Data
70 SA18 99 FD – Index
71 SA19 100 CRT – Blue
72 MEMCS16 101 CRT – Hsync
73 Refresh 102 SD8
74 PR – Data Strobe 103 SD9
75 PR – ACK 104 SD10
76 PR – Busy 105 SD11
77 PR – PE 106 SD12
78 PR – Select 107 SD13
79 PR – Auto Feed 108 SD14
80 PR – Error 109 SD15
81 PR – Initialize 110 Master
82 PR – Select In 111 Serial – CD
83 FD – Head Select 112 Serial – TXD
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