| Electronics > Repair |
| Vintage chip Programmer : " Micropross ROM 3000U " |
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| m k:
Maybe you can sniff both serial comm directions with one port. If communication is half duplex you can hook trannystors to both lines as open collector receivers and 3rd as a needed inverter. You can also use unused control pins for power and since you're not changing levels everything is naturally correct. Then you just start receiving. Everything obviously comes to same screen but if it's half duplex and own lines the whole thing should be quite understandable. Disk stuff, in case you need to shuffle with hardware. With HD stuff you're mostly always fine. You can do all DD stuff just fine if you read them back with that HD drive. Drives will have settings and some are important. I found two. Mitsumi D359T5, importer labeled Feb-95 and all settings packed away. Panasonic JU-257A606P, labeled 23/97 and settings SW1 RY/DC ready/disk change pins SW2 OUT/NC/IN density mode SW3 D0/D1 drive number SW4 IN/OUT density mode SW5 PC/AT/P2/SE speed SW6 MS/MO motor on style |
| Vince:
It's not half duplex. Oh ! Now I think of it, I got the perfect tool for the job.... an HP 4951C Protocol analyzer !! Mine came with the pod to work with RS-232C, so that's perfect. Problem is that it's missing the big cable that connects the pod with the analyzer, so it's useless. Plus it's so versatile / complicated, and the manual so thick... it takes a PhD and 6 months of training to get it to do what I did in a few minutes with a scope..... I am sure it does fancy things that I will never need, but for the basic stuff I need, it's way overkill and way too complicated. But I find it cute so I can't get myself to get rid of it.... |
| pcprogrammer:
--- Quote from: Vince on December 31, 2022, 06:36:14 pm ---55minutes wow ! Will be watching it for sure but not right now.... ... so I guess it starts by watching this video.... --- End quote --- Yes his videos are almost all 45 to 60 minutes long. I tend to skip to the bits I'm interested in :) Make sure to write protect your master disk. Open the slide on the small hole. https://electronicstechnician.tpub.com/14091/css/Write-Protect-Write-Enable-Slide-262.htm Edit: You do have nice toys :-+ A shame that the cable for it is missing. |
| TERRA Operative:
Surely a cable isn't toooo hard to make, beyond the tedium of soldering so many connections? Or just use IDC connectors and do them all in one go. :) |
| m k:
--- Quote from: Vince on December 31, 2022, 08:15:53 pm ---Oh ! Now I think of it, I got the perfect tool for the job.... an HP 4951C Protocol analyzer !! --- End quote --- I've once made a Windows bit banging analyzer for parallel and serial port but can't remember how fast it was. Today's free alternative should be available. Nowadays new construction should include an embedded MCU as a source connection. It could send blocks that the receiving computer rearranges. Shouldn't be overly complicated project, I can do the software if you're a hardware guinea pig. |
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