Code: L1 A0 IO0 R1 L2 A1 IO1 R2 L3 A2 IO2 R3 L4 A3 IO3 R4 L5 A4 IO4 R5 L6 A5 IO5 R6 L7 A6 CTL R7 <<< control (P-read, N-write) L8 A7 SEL R8 <<< selected if O L9 A8 IRQ R9 >>> interrupt request ? L10 A9 ACK R10 <<< interrupt acknowledge ? L11 A10 HLD R11 >>> hold the processor ? L12 A11 CLS R12 >>> class of the board (O for 6-trit data) L13 rsrerved R13 L14 reserved R14 L15 reserved R15 L16 reserved R16 L17 reserved R17 L18 reserved R18 L19 VNEG R19 L20 GND R20 L21 VPOS R21
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