| Electronics > Repair |
| Vintage chip Programmer : " Micropross ROM 3000U " |
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| DC1MC:
The "little" PC executable is packed (literally) with an EXE packer and with a lot of anti-reversing measures :palm:, after unpacking the decompiler doesn't load it but the program still runs. I've remembered the programs of that era, everyone and his brother were doing anti-reversing shite, not that it helped them too much with the young dedicated crackers :-DD. Anyway, I'll try to reverse it just for lolz and out of boredom. Cheers, DC1MC |
| Vince:
Thanks for that ! :-+ So that's interesting.... means the program might be much larger than 100KB.... so now there is hope that it might have decent features and user interface, great ! :D |
| m k:
The communication sniffer part can be only unidirectional. So with one sniffer port you can sniff only one side at the time. The cable itself is not very long so the driver should be able to serve two receivers. On the other hand, 1488 driver's capability is bad, or worse. Am I remembering correctly that your chips had some 75-series stuff. Those are many times non TTL level drivers and receivers. Since it's a programmer and moves more data it needs some controls, both directions. The cable is, TxD - RxD RxD - TxD GND - GND RTS - CTS CTS - RTS DTR - DSR DSR - DTR DCD RI Only one pair of controls is needed, DTR/DSR or RTS/CTS. The other pair can be looped to its counterpart. DTR is Data Terminal Ready, so it's not really for flow control, or at least wasn't meant to be so. DSR is Data Set Ready, Data Set is a modem and its connections have opposite directions, so straight through cable was used. Together they were meant to tell that the device on the other end is ready, so signals were meant to be pretty steady. RTS/CTS pair was meant to be the flow control, their names are Request To Send and Clear To Send. Three and four letter commands are a norm. There the interpreter reads up to a next whitespace and then checks the beginning. So for "start" you can also give just "sta" for three letter system. For four letter system "hello" is an exception. |
| pcprogrammer:
Hey Vince, as if Adrian knows about your project :-DD |
| Vince:
Thanks ! 55minutes wow ! Will be watching it for sure but not right now.... Making disks for the EPROM programmer is indeed high on my priority list. I have already installed that " ImageDisk " S/W on the vintage PC, but it seems so complicated and it's actualy a collection of many programs. It's overwhelming and I just don't know what file(s) to run, then what menus to go to, for what, in what order.....I just have no clue what I am doing ! :scared: I definitely need a lot of hand holding to make sure I don't ruin my precious boot disk ! ... so I guess it starts by watching this video.... Then I will have to make baby steps... I think I will first get some hands on experience with some old random 1.44MB HD disks I don't care about, using the original HD drive in the vintage computer. Then once I am successful with that and start building confidence... I will install the programmer's DD drive into the vintage computer, and do experiments with that, on my NOS DD disks.... trying to write the image file I got for the ROM 3000B system disk. Then read my original 3000U system disk and make 25 copies of it to be safe.... Anyway, I am glad I made so much progress on this programmer during my week off, because it's over... tomorrow and Monday, I am away visiting my dad. Then Tuesday back to work.... Need to make progress on my other long overdue repairs as well.... |
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