Difference between revisions of "Connector:2nd disc drive (CPC664, CPC6128, CPC6128+)"
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For your convenience, the pin no. are given as specified in the Shugart standard first, followed by the pin no. as assigned by Amstrad and shown in the manual. | For your convenience, the pin no. are given as specified in the Shugart standard first, followed by the pin no. as assigned by Amstrad and shown in the manual. | ||
| − | + | <b>Warning!</b> | |
| − | For a maximum confusion, Amstrad has completely changed the pin out on the 6128plus | + | <b>Multiple Amstrad/Schneider peculiarities have to be kept in mind: |
| + | * The numbering on the CPC664/non-German CPC6128 is exactly the opposite of that in the Shugart standard | ||
| + | * The Schneider CPC6128 manual is a 1:1 copy of the Amstrad CPC6128 manual, although the Centronics connector would need to be mounted top-down in order for the plug numbering to match the pin numbering as shown in the manual, which it isn't. | ||
| + | Thus, the pin numbers in the manual mismatch not only the Shugart standard, but also the plug. E.g.: Pin 2 on the pin out in the manual and in the table below will be numbered 13 on the plug and 33 according to the Shugart standard. | ||
| + | * For a maximum confusion, Amstrad has completely changed the pin out numbering on the 6128plus. Here, the numbers on the connector were rotated in order to match those of the plug, but still they do not match the Shugart standard: Pin 1 on the 6128plus is wire 2 of a Shugart-compatible cable, so that wire 1 cannot be connected at all and all signals are shifted by 1. | ||
| + | </b> | ||
| + | |||
| + | <h2>For these reasons it is useful not to use the entirely useless numbers from the CPC manual at all, but only to keep in mind where wire 1 of a proper Shugart cable belongs to!</h2> | ||
| + | |||
{|{{Prettytable|width: 700px; font-size: 2em;}} | {|{{Prettytable|width: 700px; font-size: 2em;}} | ||
Revision as of 09:26, 20 April 2007
The following table lists the signal on the "2nd Disk Drive" connector on the back of the CPC664/CPC6128/6128plus.
Signal names in simple brackets show the meaning the signal has today.
For your convenience, the pin no. are given as specified in the Shugart standard first, followed by the pin no. as assigned by Amstrad and shown in the manual.
Warning! Multiple Amstrad/Schneider peculiarities have to be kept in mind:
- The numbering on the CPC664/non-German CPC6128 is exactly the opposite of that in the Shugart standard
- The Schneider CPC6128 manual is a 1:1 copy of the Amstrad CPC6128 manual, although the Centronics connector would need to be mounted top-down in order for the plug numbering to match the pin numbering as shown in the manual, which it isn't.
Thus, the pin numbers in the manual mismatch not only the Shugart standard, but also the plug. E.g.: Pin 2 on the pin out in the manual and in the table below will be numbered 13 on the plug and 33 according to the Shugart standard.
- For a maximum confusion, Amstrad has completely changed the pin out numbering on the 6128plus. Here, the numbers on the connector were rotated in order to match those of the plug, but still they do not match the Shugart standard: Pin 1 on the 6128plus is wire 2 of a Shugart-compatible cable, so that wire 1 cannot be connected at all and all signals are shifted by 1.
For these reasons it is useful not to use the entirely useless numbers from the CPC manual at all, but only to keep in mind where wire 1 of a proper Shugart cable belongs to!
| Pin No. (Shugart) | Pin No. (CPC) | Pin No. (6128plus) | Signal Name | Description |
| n/a | "35" | n/a | N/C | Schneider CPC6128 only |
| 1 (red wire¹) | 34 | none - spare wire^4 | GND | Ground |
| 2 | 33 | 1 | N/C (/REDWC) | Density Select 1=Low/0=High |
| 4 | 31 | 3 | N/C | Reserved |
| 6 | 29 | 5 | N/C | Reserved |
| 8 | 27 | 7 | /Index | 0=Index |
| 10 | 25 | 9 | N/C (/MOTEA) | -/- (0=Motor Enable Drive 0) |
| 12 | 23 | 11 | /DRVSB | Drive Select 1 |
| 14 | 21 | 13 | N/C (/DRVSA) | -/-(Drive Select 0) |
| 16 | 19 | 15 | /MOTEB | 0=Motor Enable Drive 1 |
| 18 | 17 | 17 | /DIR | 0=Direction Select |
| 20 | 15 | 19 | /Step | 0=Head Step |
| 22 | 13 | 21 | /WDATE | Write Data |
| 24 | 11 | 23 | /WGATE | Floppy Write Enable, 0=Write Gate |
| 26 | 9 | 25 | /TRK00 | 0=Track 00 |
| 28 | 7 | 27 | /WPT | 0=Write Protect |
| 30 | 5 | 29 | /RDATA | Read Data |
| 32 | 3 | 31 | /SIDE1 | 0=Side 1 Select |
| 34 | 1 (blue wire²) | 33 | /RDY (/DSKCHG) | 0=Ready (1=Disk Change/0=Ready³) |
| n/a | n/a | 35 | N/C | Amstrad 6128plus only |
| All others (odd) | All others (even) | All others (even) | GND | Ground |
¹: Assuming you are using a cable which is made to match the Shugart standard on the floppy side.
²: Original cables from Amstrad/Schneider had blue wires to mark pin 1 (which is pin 34 in Shugart standard).
³: Although it might look like it, /RDY and /DSKCHG are not compatible. The CPC expects the drive to become ready (=0) by itself, while the DSKCHG signal stays high until confirmation through the PC, so the drive will never become RDY.
^4: Due to the first signal being on pin 1, there is no pin left for the first wire of the floppy cable (usually red). You can just cut it off, it's just another GND.
Except for the hint in note 3, a PC floppy can be directly operated on this connector, as long as you keep attention to the fact that the red wire of a PC floppy cable which is unchanged on the floppy side belongs on pin 34 of the CPC connector. Some drives can be jumpered to output the desired /RDY signal, some can at least be soldered. Others can be operated by "tuning" the cable. See 3 1/2" & 5 1/4" Disk Drives for more detailed instructions, incl. Side Switch.
