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19 December 2017, 21:37
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#1 |
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Registered User
Join Date: May 2010
Location: Czech Rep
Posts: 599
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Cd32 Rx Tx Signals
Recently I made a keyboard adapter for CD32. I also wanted to make use of the RxD TxD signals which are supposed to be present in the keyboard MiniDIN connector. But when I run term software loopback test work, but when connected to other computer I only get corrupted characters. Question is: can these signals be used directly or not?
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19 December 2017, 22:05
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#2 |
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Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
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I tap these pins when i diagnose the TF328. So yes.
EDIT: they are 5V TTL level signals. |
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20 December 2017, 17:33
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#3 | |
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Join Date: May 2010
Location: Czech Rep
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Quote:
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20 December 2017, 17:42
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#4 |
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Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 6,334
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And inverse polarity, correct. There are a number of different ICs that can be used to switch the signal as required, and could be powered off the +5V line present in the Aux connector if you wanted to go that way...
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20 December 2017, 17:49
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#5 |
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Join Date: May 2010
Location: Czech Rep
Posts: 599
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If that IC's can be powered from the port, it would certainly be nice to try. Can you hint the suitable IC?
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20 December 2017, 18:07
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#6 |
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Join Date: Jun 2016
Location: Stoke-On-Trent, England
Posts: 450
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Not tried it, but this should do what you are after?
https://www.ebay.co.uk/itm/253041807807 |
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20 December 2017, 18:20
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#7 | |
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Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
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Quote:
TTL level RS232 is inverse polarity. Normal TTL level USB adapters just work. |
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20 December 2017, 18:28
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#8 |
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Registered User
Join Date: May 2010
Location: Czech Rep
Posts: 599
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I would prefer convert them to standard serial level because then serial-multiplayer amiga games will be possible too.
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20 December 2017, 18:56
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#9 |
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Join Date: Feb 2017
Location: Cirencester, UK
Posts: 113
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There are a number of MAX chips that will do the job, how comfortable are with SMD as the best suited only comes in a tiny package? Through hole DIPs are available for other ones though
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20 December 2017, 18:58
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#10 |
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Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
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IIRC the MAX323 types come in DIP 8 if SMD is a problem
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20 December 2017, 18:59
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#11 |
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Registered User
Join Date: May 2010
Location: Czech Rep
Posts: 599
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Yes, I can see some of those MAX232 schematics on google. Will try to build one later.
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20 December 2017, 23:47
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#12 |
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Registered User
Join Date: Jan 2005
Location: Umeå
Age: 43
Posts: 922
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I bought a kit with TTL<->RS232 converter on pcb connected to dsub9-male complete with plastic housing:
https://www.artekit.eu/products/accessories/ak-rs232/ Combined it with a PS/2 Y-adapter cable, which I cut of the PS/2 connector which had the TXD and RXD pins connected and soldered to the above converter: http://eab.abime.net/showpost.php?p=...6&postcount=43 |
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21 December 2017, 13:56
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#13 |
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Registered User
Join Date: May 2010
Location: Czech Rep
Posts: 599
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Nice and clever. Good to know it works.
I see you also have a floppy working with CD32? |
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21 December 2017, 14:46
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#14 |
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Registered User
Join Date: Jan 2005
Location: Umeå
Age: 43
Posts: 922
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It is this one:
http://amiga.resource.cx/exp/fwsi Bought it from analogic computers, I still think they sell it. I don’t have mine any longer though, gave it to someone who makes much better use of it. |
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