Alps Electric MD-1300 Interface, DIP Switches, Connector Signals, Appendix, ON OFF 1 2 3

Appendix

Interface

Connector

Amphenol 50 pin female

25 1

5026

Connector Signals

Signal name		Signal name			Signal name				Signal name
1	GND	14	GND		27	DB1			40	GND
2	GND	15	GND		28				41
							DB2				ATN
3	GND	16	GND		29	DB3			42	GND
4	GND	17	GND		30				43
							DB4					BSY
5	GND	18	GND		31				44
							DB5							ACK
6	GND	19	GND		32				45
								DB6				RST
7	GND	20	GND		33				46
						DB7							MSG
8	GND	21	GND		34				47
								DBP		SEL
9	GND	22	GND		35	GND			48
										C/D
10	GND	23	GND		36	GND			49
											REQ
11	GND	24	GND		37	GND			50
										I/Q
12	GND	25	GND		38	TMP
13	–	26			39	GND
				DBO
	; UNUSED

DIP Switches

DIP switches are used to set the SCSI ID number.

ON

OFF 1 2 3 4

The following summarises the settings for each SCSI device number.

1	2	3	4	SCSI No.
OFF	OFF	OFF	OFF	No.0
ON	OFF	OFF	OFF	No.1
OFF	ON	OFF	OFF	No.2
ON	ON	OFF	OFF	No.3
OFF	OFF	ON	OFF	No.4
ON	OFF	ON	OFF	No.5
OFF	ON	ON	OFF	No.6 (Factory default settings)
ON	ON	ON	OFF	No.7 *

*SCSI device number 7 is reserved for the Macintosh itself. Device number 0 is normally assigned to the internal hard disk drive, if there is one. To be safe, use only device numbers 1 through 6.

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