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External floppy drives on the Spectrum +3

2,301 bytes added, 02:05, 27 November 2012
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[[category:hardware]]
[[category:spectrum]]
====External Drive Connector====
The ''"Disk B:'' connector on the +3 is slightly non standard and there is an error in the manual which adds to the confusion. The connector is rotated through 180 degrees so pin 1 is at the top right rather than the bottom left (looking in from the rear of the computer). The indexing slot is also at the opposite end to normal, instead between pins 31/32 and 33/34, this means that a keyed floppy cable will only fit in the '''wrong''' orientation unless the key is (re)moved.
 
{| class="wikitable" style="text-align: center;"
|+ External drive connector pinout (viewed from rear of computer)
|- style="font-size: 70%;"
! style="width: 5em;" | 33
! style="width: 5em; border-width: 1px 4px 1px 1px; border-right-style: double;" | 31
! style="width: 5em;" | 29
! style="width: 5em;" | 27
! style="width: 5em;" | 25
! style="width: 5em;" | 23
! style="width: 5em;" | 21
! style="width: 5em;" | 19
! style="width: 5em;" | 17
! style="width: 5em;" | 15
! style="width: 5em;" | 13
! style="width: 5em;" | 11
! style="width: 5em;" | 9
! style="width: 5em;" | 7
! style="width: 5em;" | 5
! style="width: 5em;" | 3
! style="width: 5em;" | 1
|- style="font-size: 70%;"
| GND
| style="border-width: 1px 4px 1px 1px; border-right-style: double;" | GND
| GND || GND || GND || GND || GND || GND || GND || GND || GND || GND || GND || GND || GND || GND || GND
|- style="font-size: 50%;"
| colspan="17" style="border:;" |
|- style="font-size: 70%;"
| style="text-decoration:overline;" | READY
| style="border-width: 1px 4px 1px 1px; border-right-style: double; text-decoration:overline;" | HD_SEL
| style="text-decoration:overline;" | RD || style="text-decoration:overline;" | WR_PROT || style="text-decoration:overline;" | TRACK0 || style="text-decoration:overline;" | WR_GATE || style="text-decoration:overline;" | WR_DATA || style="text-decoration:overline;" | STEP || style="text-decoration:overline;" | DIR_IN || style="text-decoration:overline;" | MTR_ON || NC || style="text-decoration:overline;" | DRIVE1 || NC || style="text-decoration:overline;" | INDEX || NC || NC || NC
|- style="font-size: 70%;"
! 34
! style="border-width: 1px 4px 1px 1px; border-right-style: double;" | 32
! 30 || 28 || 26 || 24 || 22 || 20 || 18 || 16 || 14 || 12 || 10 || 8 || 6 || 4 || 2
|-
|}
 
====Cable====
[[File:Spectrum_plus3_external_floppy_drive_cable.jpg|thumb|An example of a suitable cable]]

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