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Post by mirkosoft on Apr 14, 2017 11:51:54 GMT
Hi!
I want to use one disk drive for two computers. I don't want always reconnect serial cable - I want to ceate switcher where 1 wire goes to drive and two wires to computers - to selected by switcher. DIN-6 connector is used for IEC serial. I was searching over the web, but results were always about MIDI (of course) and miniDIN or DIN to PS/2....
So, I'm asking: Can anybody explain me how to connect 3 DIN-6 connectors to create switcher written above? Or even better - knows about any switcher possible to buy?
Thank you for each help. Miro
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Post by remark on Apr 14, 2017 17:54:09 GMT
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Post by mirkosoft on Apr 14, 2017 21:34:32 GMT
Ok, but will be problem when will be one computer turned on and second off? Requires it switch or not?
Miro
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Post by remark on Apr 15, 2017 10:05:42 GMT
This cable gives you an extra connector, instead of 1 you now have 2. It functions when 1 computer is turned off. If you want both computers to be active, then you would probably need a switch (I don't know what happens with 2 masters on the bus). Normally you would have enough connectors, because all commodore iec-devices have 2 connections for iec-cable, but this is not the case in your situation?
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Post by Pyrofer on Apr 15, 2017 10:38:44 GMT
The bus has pullups on it. You would end up feeding 5v INTO the "off" computer this is not good.
I would say you need a multipole switch. You also need to be careful with ground as you will essentially be connecting different ground levels (2 PSUs) together.
You want a full multipole break before make switch for this and nothing less. That or a complex logic device that interfaces on the bus like the digital printer switches of old.
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Post by mirkosoft on Apr 15, 2017 10:50:52 GMT
OK, this cable helps me not... I think: Is possible to connect all 6 wires to DB9 input port and at same positions DB9 output ports? Of course, to DB9 will be soldered always DIN-6... Reason: DB9 data switches are easy to find...
Miro
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Post by remark on Apr 15, 2017 10:56:34 GMT
The bus has pullups on it. You would end up feeding 5v INTO the "off" computer this is not good. I would say you need a multipole switch. You also need to be careful with ground as you will essentially be connecting different ground levels (2 PSUs) together. You want a full multipole break before make switch for this and nothing less. That or a complex logic device that interfaces on the bus like the digital printer switches of old. There are only pull-ups on the computer side? (not in the floppy drive/printer). I mean these will also get the 5V and contain a CPU and will potentionally be damaged if not turned on? EDIT To answer my own question, the 5V originates at the computer side, the devices are designed to receive it, not originate. Consequently the C128 was not designed to receive the 5V. EDIT
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Post by Pyrofer on Apr 15, 2017 19:35:56 GMT
The idea of using a DB9 switch box sounds good, as long as it breaks all the lines and does break before make it should be fine.
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Post by mirkosoft on Apr 16, 2017 1:33:49 GMT
So, I will create it in free time after holidays and will report. Miro
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Post by mirkosoft on Aug 14, 2017 22:19:24 GMT
So, I got all parts few days ago. First before I create any switcher I want to ask if I need it really. I want to use for Commodore 128DCR and Comodore 64DTV single PC computer harddisk by 64HDD Pro. I have this adapter: One wire can be connected to C128 and 2nd by cable to C64DTV, of course parallel connection is connected to PC. I have simple Q after my DCR PSU failure: Can connecting to both Commodores and PC with 64HDD damage anything? No matter if is connected one single or two or all three compuers - can connection to both and also PC damage anything? I'm afraid 'cause PSU failure was to precious for me. And second Q after - if are both connected - and powered on DCR and DTV - will it hang at access any drive or only if will be accessed same drive? Thank you for all answers. If is anywhere problem, after reply I do device switcher and post images here. Miro
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