User Manual - Rev 2.1
Contents
1. Interface connector Upper side of the FOD Pin numbers FOD side signal interface connector aa Cupper side signal interface connector Cable side A Side view Top view brdin Figure 2 Singal interface connector external view Lower sid of the FOqd 3 USER SELECTABLE STRAPS The FDD is equipped with the following selectable straps on the main PCBA Insertion of a short bar onto the post pin is defined as the on state of the strap mm HBO uu mm AOL J vu mm HDH UU ono D i ij on ID UU j mn DO ULU j p Figure 3 3 1 DO and D1 Straps a In the multiplex contro by daisy chain connection these straps designate the address of the FDD b By the combination with the DRIVE SELECT 0 and 1 signals two addresses can be designated Refer to Fig 3 and item 8 3 1 3 2 HDH HDL DI and HDO Straps a Table 3 shows the combination of the straps Four designating methods are offered for selection 1 Selection No 1 The FDD switches the density mode according to the HD IN input signal from the host controller HIGH level corresponds to high density mode 2 Selection No 2 The FOD switches the density mode according to the HD IN input signal from the host controller LOW level corresponds to high density mode 3 Selection No 3 The FDD switches the density mode automatically by detecting the existence of the HD hole of the inserted diskette 4 Sel2. ection No 4 The host controller switches the density mode according to the HD OUT output signal from the FDD HIGH level corresponds to high density mode f Strap Setting Density mode designation H Signal on pin No 2 HD IN Key in or software D IN signal from HIGH HD host side HD IN Key in or software HD IN signal from LOW HD host side Key in or software Automatic by HD hole sensor HD OUT HD OUT signal HIGH HD Automatic by HD hole sensor from FOD Note 1 mark indicates off state of the strap 2 Never set any strap combinations other than the above Table 3 Function selection for interface pin No 2 ERGO MD 21 MICRO FLOPPY DISK DRIVE USER MANUAL REV 2 1 Copyright 1991 by Ergo System International Company Ltd 1 Power Interface Connector and Cable 1 Power interface connector a pin numbers 4 pins b Connector external view See Fig 1 c Power interface connections See Table 1 2 Power interface cable Any appropriate cables capable of taking the maximum power consumption of the FDD will be acceptable Power voltage Pin numbers Ee L No comeco a Table 1 DC Power Connector pin assignment T Interface connector Upper side 4 3 2 1 Pin number oO Go oO a of the FDD t l PCB Rear view FDD side Hs cable side Top view cabie Fig
3. ure 1 Power interface connector external view 2 Signal Interface Connector and Cable 1 Signal interface connector a Pin numbers and pin pitch 2 54 mm 0 1 in pitch 34 pins block header 17 pins double rows even number pins are upper side of the FDD b Connector external view See Fig 2 c Interface connection See Table 2 2 Signal interface cable Maximum cable length 1m 3 3 feet at 1KQ terminator For daisy chain connection the cable length should be less than 1m Signas Pins nos sinas ooo Directions HD IN OPEN HD OUT IN OUT our DRIVE SELECT 0 DRIVE SELECT 1 MOTOR ON DIRECTION SELECT step WRITE DATA WRITE GATE TRACK 0 WRITE PROTECT READ DATA SIDE ONE SELECT 3 DISK CHANGE Note Refer to item 11 2 as to the output signal selection of pin No 2 Table 2 Signal interface pin assignment
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