Caple C871i Uživatelský manuál stáhnout pdf (Strana 331)

100

101

Apple II Computer Info

Another option (possibly cheaper) would be to bypass the parallel cable

and connect directly to the DB-25 provided by the parallel card. The

disadvantage with this method is that the pinout of Apple II parallel

cards are different for different brands. The Grappler is similar to

the PC's parallel port, but most other cards are completely different.

The cable that is supplied with each parallel card will usually only

work with that card.

I'd suggest sticking to the Centronics connector for now, since it lets

you switch to another parallel card (or even another computer) without

having to modify your cable or circuitry.

The Centronics pinout is documented in most older parallel printer

manuals. Off the top of my head, I can remember the following:

1 STROBE (active low) from computer

2 Data bit 0

3 Data bit 1

4 Data bit 2

5 Data bit 3

6 Data bit 4

7 Data bit 5

8 Data bit 6

9 Data bit 7

10 ACK (active low) from printer

11 BUSY from printer

I've dug out a Panasonic printer manual, and it lists the rest of them

as follows:

12 PAPER EMPTY (output from printer)

13 SELECT (output from printer)

14 AUTO FEED XT (input to printer, active low)

15 (unused)

16 Signal Ground

17 Frame Ground

18 +5V (output from printer, reference voltage only)

Pins 19 through 29 are ground lines, paired with each of the STROBE

through BUSY lines (for use in a twisted pair or ribbon cable). Pin 30

is the ground return line for pin 31 (PRIME).

31 PRIME (reset input to printer, active low)

32 ERROR (output from printer, active low)

33 Signal Ground

34 (unused)

35 (unused)

36 (unused)

I happen to remember that some printers use pin 36 as a SELECT ENABLE

input, but I don't recall the polarity.

All signals are TTL-compatible, with rise and fall times less than 0.2

microseconds.

The pins are numbered in the same manner as a DB-25 - along the top row

and then in the same direction along the bottom row. What I'm not

certain about is which end has pins 1 and 19. The diagram in this

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 331 of 572

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Caple C871i Uživatelský manuál Strana 331

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