M9058 - BA123 signal Distribution Board Jumper List

From Table 1-1:BA123 signal Distribution Board Jumpers

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Jumper		Setting		Meaning
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W1, W2		Out		Grant continuity not maintained.
W1, W2		In		Grant continuity maintained.

W3		In		DRV SEL 3 connected to DS1-DS4 of J1.
		Out		DRV SEL 3 connected to DS3 of J1.

W4		In		DRV SEL 4 connected to DS1-DS4 of J2.
		Out		DRV SEL 4 connected to DS4 of J2.

W5		In		DRV SEL 1 connected to DS1-DS4 of J3.
		Out		DRV SEL 1 connected to DS1 of J3.

W6		In		DRV SEL 2 connected to DS1-DS4 of J4.
		Out		DRV SEL 2 connected to DS2 of J4.


TP1 to TP2			DRV SEL 1 and 2 connected to DS1 and DS2 of J11.
TP1 to TP3			DRV SEL 2 connected to DS1 and DS2 of J11.
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The factory position appears first.
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Jumpers W3 through W6 determine the connections between the drive select lines from
a fixed-disk controller (DRV SEL 1 through DRV SEL4) and a fixed -disk drive (DS1 
through DS4). As long as these jumpers are inserted, you can configure the drives
to respond to any drive select line.

TP1 and TP2 determine the connections between the drive lines from a diskette drive
controller (DRV1 through DRV4) and a diskette drive (DS1 through DS4).  For a RX50,
connect TP1 tp TP2 for both drives.

You can connect up to four fixed-disk drives (or an RX50 diskette drive and two fixed-
drives) to the signal distribution board.  A 50-conductor ribbon cable connects the 
board to an RQDX mass storage controller module in the card cage.  Another ribbon
cable connects the board to the RD console boards behind the control panel.