Specifications

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Note that the Little Board/286 does not generate +/- 12VDC or -5VDC for the AT Expansion
Bus. If devices on the AT Expansion Bus will require these voltages, they can be supplied to
the AT Expansion Bus connector from the board's utility connector (J4). One handy feature of
the Ampro MiniBackplane/ATBus is that it has a provision for optional onboard DC-to-DC
converters for all bus voltages other than +5VDC.
Table 2-18A. AT Expansion Bus Connector, A1-A32 (J9)
PIN SIGNAL NAME FUNCTION IN/OUT
A1 -I/O CH CK Memory Parity Error in
A2 D7 Data bit 7 i/o
A3 D6 Data bit 6 i/o
A4 D5 Data bit 5 i/o
A5 D4 Data bit 4 i/o
A6 D3 Data bit 3 i/o
A7 D2 Data bit 2 i/o
A8 D1 Data bit 1 i/o
A9 D0 Data bit 0 i/o
A10 I/O CH RDY Processor Ready Ctrl in
A11 AEN Address Enable i/o
A12 A19 Address bit 19 i/o
A13 A18 Address bit 18 i/o
A14 A17 Address bit 17 i/o
A15 A16 Address bit 16 i/o
A16 A15 Address bit 15 i/o
A17 A14 Address bit 14 i/o
A18 A13 Address bit 13 i/o
A19 A12 Address bit 12 i/o
A20 A11 Address bit 11 i/o
A21 A10 Address bit 10 i/o
A22 A9 Address bit 9 i/o
A23 A8 Address bit 8 i/o
A24 A7 Address bit 7 i/o
A25 A6 Address bit 6 i/o
A26 A5 Address bit 5 i/o
A27 A4 Address bit 4 i/o
A28 A3 Address bit 3 i/o
A29 A2 Address bit 2 i/o
A30 A1 Address bit 1 i/o
A31 A0 Address bit 0 i/o
A32 GND (*) Ground ---
(*) Note: A32 is an added ground. It can be left unconnected
when using standard backplanes or cards.