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Apple II Computer Info

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### Created : Wednesday, May 6, 1998 Modified: Wednesday, May 6, 1998

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From: [email protected] (David Wilson)

Newsgroups: comp.sys.apple2

Subject: Re: db-19 drive cable compatibility: A2 vs Mac

Date: 6 May 98 02:51:43 GMT

Organization: University of Wollongong, NSW, Australia.

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Message-ID: <david.894423103@wraith>

References: <[email protected]>

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[email protected] (stephen e buggie) writes:

> COMPATIBILITY EXPERIMENTS OF APPLE II VS. EARLY MAC

> DB-19 DISK DRIVE CABLES

> I am unable to get the Mac db-19 cables to run with Disk II. Last

>weekend, I tediously measured PINOUTS on the A2 db-19 cable vs. the older

>Mac db-19 cables. Here are the disturbing results:

> First, the A2 db-19 cable uses 18 lines, while the Mac db-19 cable

>uses only 17 lines. For A2, pins 5 and 9 are used, and pin 16 is vacant.

>The Mac db-19 cable is vacant on pin #5.

> Is there any hope of modifying the Mac db-19 cable to make it work

>with A2? How vital is pin #9 wire line in the A2 drive cable? I have

>toyed with the idea that I could run a jumper in the A2 male plug from

>pin 5 to pin 16, then on the IDE-20 change the crimp pin to position 5.

>But this would do nothing about pin #9 ...

Here are the pinouts from Nathan's web page:

Much of this information comes from page 90 of Open-Apple Volume 1, number 11

(1985).

The following table lists all of the drive control signals for each type of

controller card/disk port.

signal function Unidisk IIc IIgs Disk ][

GND ground reference 1-4 1-4 1-3 1,3,5,7

-12V -12 volts DC 5 5 5 9

+5V +5 volts DC 6,16 6 6 11,12

+12V +12 volts DC 7,8 7,8 7,8 13,15,17,19

WRPROT write protect 10 10 10 20

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 100 of 572

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 571 572

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