rs232 hex inverter
in [Commodore]
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From: Markco on 11 Feb 2007 21:54 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
From: Brian Ketterling on 13 Feb 2007 06:15 Markco wrote: > Does anyone happen to know if a 74LS04N hex inverter can be used as a > substitute for a 7404N ? I think that in most circuitry, you can replace a 74xx with a 74LSxx or 74HCTxx, and the main effect will be lower power consumption. Brian --
From: Markco on 13 Feb 2007 09:36 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. "Brian Ketterling" <tweel6510(a)no-potted-meat-products-peoplepc.com> wrote in message news:85hAh.1030$x74.523(a)newsread4.news.pas.earthlink.net... > Markco wrote: >> Does anyone happen to know if a 74LS04N hex inverter can be used as a >> substitute for a 7404N ? > > I think that in most circuitry, you can replace a 74xx with a 74LSxx or > 74HCTxx, and the main effect will be lower power consumption. > > Brian > -- > >
From: David Murray on 13 Feb 2007 12:17 > 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: Brian Ketterling on 13 Feb 2007 13:08
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.). Brian -- |