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Author Topic: IBM 3852 / Canon PJ-1080A  (Read 2499 times)

Lisa2

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Re: IBM 3852 / Canon PJ-1080A
« Reply #15 on: September 09, 2021, 04:16:38 pm »

Does anyone here have an original DMP cable and would they be able to verify the pinout?

The pinout for this cable ( 590-0042-B) is correct.   See attached photos.  Also note that when I played with this in the past I did not connect pins 16 or 35 on the printer side ( I don't remember if this helped or not).  Maybe you can try this on your cable.

Rick

« Last Edit: September 09, 2021, 08:35:40 pm by Lisa2 »
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blusnowkitty

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Re: IBM 3852 / Canon PJ-1080A
« Reply #16 on: September 09, 2021, 09:53:46 pm »

Thanks Rick! I'll try rebuilding my DMP cable to see what happens. Interestingly there's still an error in the text on Apple's website - they omit Pin 14. I see in the printed document that Pin 14 on the Lisa is GND, and that gets tied to BSY on the Centronics side. Although strange is that Tom's adapter pinout leaves BSY floating and it still works for him, but he's also got a proper 1080A.

I think my next step here is going to be breadboarding up a bunch of LEDs in between the Lisa and the printer just to make sure data is flowing to the printer. I'm also wondering if the 1080A driver sends something that the 3852 doesn't like? On the other hand that shouldn't be the case. The Generic / Text Only driver in Windows does make it print.
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compu_85

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Re: IBM 3852 / Canon PJ-1080A
« Reply #17 on: September 28, 2021, 01:31:02 pm »

I just beeped out my cable,

ptr | db25
1   15
2   5
3   6
4   8
5   22
6   23
7   11
8   12
9   13
10   16
11   14
12   19
13   21
14   na
15   na
16   na
17   na
18   na
19   2
20   na
21   na
22   na
23   na
24   na
25   na
26   na
27   na
28   na
29   na
30   na
31   na
32   25
33   na
34   18
35   na


db25 | ptr
19   2
2   5
3   6
4   8
7   11
8   12
9   13
11   14
10   16
34   18
12   19
13   21
5   22
6   23
32   25

-J
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blusnowkitty

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Re: IBM 3852 / Canon PJ-1080A
« Reply #18 on: July 11, 2022, 09:29:24 pm »

Bit of a bump, but just to bring this full circle...

Haven't had time or money to make an interposer board to signal snoop, not sure if I'll bother. I did snag a couple of those official Apple printer cables and they came in just now, and the behaviour between the official cable and my attempts at rewiring a PC cable yielded the same results. Whoever said it was right - I guess IBM wrote (or commissioned Canon to write) a totally new ROM with no backwards compatibility for the 1080A print codes. Disassembling the 1080A ROM to hack it into the 3852 memory map is not my forte either... I guess the hunt is on for a proper 1080A.
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blusnowkitty

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Re: IBM 3852 / Canon PJ-1080A
« Reply #19 on: January 07, 2023, 12:19:57 pm »

Another bump. Got something very special this morning...

Case is in somewhat rough shape, but electrically and mechanically seems to be fine. I can probably swap parts around with my 3852 to make one nice looking 1080A. Has the manual and two new cartridges as well though I threw in my IBM carts in this picture since I knew they were full of brand new ink from when I was playing with the 3852.

There's one other difference between the 1080A and the 3852 besides the main board and ROM differences - IBM apparently specced up the paper path to have tractor feed sprockets; the 1080A doesn't feature those at all. It'll still print on tractor feed paper but it has a bad tendency to skew.

Thanks Ray.
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compu_85

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Re: IBM 3852 / Canon PJ-1080A
« Reply #20 on: January 07, 2023, 02:57:43 pm »

Sweet!
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