From: Brian Ketterling on 13 Feb 2007 13:12 Markco wrote: > Thanks Brian. In a c64 that could be a good thing. :-)Planning on putting > together the simple rs232 interface Jeff has the schematic for on the > Petscii site. Got plenty of old circuit boards to cannibalize. If you ever > need a particular chip, let me know I'll see if I can find it here. Thank *you*! Brian --
From: Clockmeister on 13 Feb 2007 14:04 "Markco" <onthfly1(a)hotmail.com> wrote in message news:xGQzh.56$On7.55(a)newsfe04.lga... > Does anyone happen to know if a 74LS04N hex inverter can be used as a > substitute for a 7404N ? I looked at the data sheets and the pinouts are > the same for both chips. However some of the internals for the inverter > circuits are set up a little differently. I'm thinking about putting > together a simple rs232 interface for the C64 userport and wanted to know > if I would run into problems if I used the other chip as a substitute. > All should work fine in that application. A good idea would be to socket the chip though, just in case.
From: Oldbitcollector on 13 Feb 2007 15:28 On Feb 11, 9:54 pm, "Markco" <onthf...(a)hotmail.com> wrote: > Does anyone happen to know if a 74LS04N hex inverter can be used as a > substitute for a 7404N ? I looked at the data sheets and the pinouts are the > same for both chips. However some of the internals for the inverter circuits > are set up a little differently. I'm thinking about putting together a > simple rs232 interface for the C64 userport and wanted to know if I would > run into problems if I used the other chip as a substitute. > > Thanks I suspect that it will work, my only reservation being that the 7404 was tolerant of the 5v side of the 64. Being you only need two gates, give it a shot. Worse can happen is you will fry the 74LS04N Jeff
From: Markco on 13 Feb 2007 15:50 David, you're always thinking creatively :-) Even if you hardwired a small daughterboard for rs232 into the user port, you could always set up a disconnect switch so other stuff could be done with the userport. One chip, a few small wires, and a 9 pin serial plug wouldn't take up much room. "David Murray" <adric22(a)yahoo.com> wrote in message news:1171387039.947970.96780(a)v33g2000cwv.googlegroups.com... > >> Thanks Brian. In a c64 that could be a good thing. :-)Planning on putting >> together the simple rs232 interface Jeff has the schematic for on the > > hey.. I wonder how hard it would be to fit the RS232 converter INSIDE > the C64 and put a 9-pin serial port on the back of the C64? I am > positive the original breadbox C64 has room, I'm not sure about the > 64C, though. On the other hand, I bet a 128D would be no problem. > That would be pretty neat. >
From: Tristan Mumford on 13 Feb 2007 23:10 Brian Ketterling wrote: > David Murray wrote: >> hey.. I wonder how hard it would be to fit the RS232 converter INSIDE >> the C64 and put a 9-pin serial port on the back of the C64? I am >> positive the original breadbox C64 has room, I'm not sure about the >> 64C, though. On the other hand, I bet a 128D would be no problem. >> That would be pretty neat. > > You could put it on a pretty tiny circuit board, so I don't think it would > be a problem. If you're going for a permanent interface, though, you > might > use a better circuit, like a MAX232 chip. Another notion would be to > install a Datapump/SwiftLink/Turbo232 type interface, but either case, > you'd be effectively jacking something permanently into either the User > Port or Expansion Port, which could prevent you from connecting other > things that need those lines (U.P.)or that I/O space (E.P.). > It's not in my C64 but I did make up a small max232 board for experimentation etc. I used one of those small cruddy single chip boards that seem to be designed to attach a small chip to flying leads. With a little creativity all the caps fit along with a reinforced D9 connector. You could fit the adaptor above the userport in a C64C. I have a D25 wired to the userport mounted in its own hole above. I use this for testing things etc. My plan is to make a MAX232 based dongle to plug into that D25. -- -----> http://members.dodo.com.au/~izabellion1/tristan/index.html <----- ===== It's not pretty, it's not great, but it is mine. =====
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