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Re: Disk ][ to //c
Primoduke wrote:
Well....Hello again. It seems that things are no always as easy as one
would like them to be!! So... I need of your help again.
Besides the pin to pin table Wayne gave me to build the cable, I've
searched for some extra info on the net and I've found other people's
tables, but I've found some discrepancies regarding to the voltage
lines..
Here are them, where Table 1 is Wayne's, Table 2 is from a post on
this newsgroup back on 9 Feb 92 and Table 3 from another post on 28
Mar 95
Table 1 Table 2 Table 3
=========== =========== ===========
20p 19p 20p 19p 20p 19p
--- --- --- --- --- ---
1 ----- 1 1 ----- 1 1 ----- 1 GND
2 ----- 11 2 ----- 11 2 ----- 11 PHASE A
3 ----- 2 3 ----- 2 3 ----- 2 GND
4 ----- 12 4 ----- 12 4 ----- 12 PHASE B
5 ----- 3 5 ----- 3 5 ----- 3 GND
6 ----- 13 6 ----- 13 6 ----- 13 PHASE C
7 ----- 4 7 ----- 4 7 ----- 4 GND
8 ----- 14 8 ----- 14 8 ----- 14 PHASE D
9 ----- 5 9 ----- 5 9 ----- 5 -12V
10 ----- 15 10 ----- 15 10 ----- 15 WRITE REQ
11 ----- 6 11 ----- 6 11 ----- 6 +5V
DIF!!>12 ----- n/c 12 ----- 6 12 ----- 16 ## +5V
DB19-pin16= n/c
13 ----- 7 13 ----- 7 13 ----- 7 +12V
14 ----- 17 14 ----- 17 14 ----- 17 DRIVE ENBL (Drive One)
DIF!!>15 ----- 8 15 ----- 7 15 ----- 8 ## All= +12V
16 ----- 18 16 ----- 18 16 ----- 18 READ DATA
DIF!!>17 ----- 9 17 ----- 8 n/c ## IDC20-pin17= +12V
DB19-pin9= Drive2
DB19-pin8= +12v
18 ----- 19 18 ----- 19 18 ----- 19 WRITE DATA
DIF!!>19 ----- n/c 19 ----- 8 n/c +12V
20 ----- 10 20 ----- 10 20 ----- 10 WRITE PROTECT
DIF??>n/c----- 16 n/c----- 16 ??? DB19-pin16= n/c
I went over them very carefully
On the 20 pin connector pin 12 has no connection, there isn't even wire
to that pin
Pin 15 is connected to pin 8
Pin 17 is connected to pin 9
Pin 19 is n/c
On the 19 pin connector pin 16 doesn't even exist so it's definetly n/c
So, I'm not sure how exactly build my cable, and since the
discrepances here are with Voltage lines, I'm afraid to end with a //c
and a Drive ][ both fried like eggs, and remember how difficult to
find these machines are here in Argentina! So here comes another
question: why the IDC has four pins with +12v: are they for different
purposes? Or it's just the same if I connect the +12V pin on the DB 19
(pin 7) to any +12V pin on the IDC 20 (pins 13, 15, 17 and 19)??? Does
the drive ][ need to recive +12v through each of these pins??? And
finnally, on TABLE 3, IDC20-pin12 <-----> DB19-pin16, should be a
typing mistake... what do you think?
Thanks again.
Seba
If you look at the top of the analog card in your disk II you'll find
one trace connects pins 13, 15, 17, and 19.
On the bottom of the Analog card pins 11 & 12 are connected
So because these pins are connected Tables 1 and 2 are effectively
identical.
Wayne