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VK3ABK > TECH 05.03.04 14:13l 31 Lines 1291 Bytes #999 (0) @ WW
BID : 17348_VK3KAY
Read: DB0FHN GUEST OE7FMI
Subj: Re: Printer Port to Serial.
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<VK6HGR<VK3KAY
Sent: 040305/1134Z @:VK3KAY.#WEV.VIC.AUS.OC #:17348 [Wendouree] $:17348_VK3KAY
From: VK3ABK@VK3KAY.#WEV.VIC.AUS.OC
To : TECH@WW
Hello all Converters.
I have just read two replies to Rickie, N2RIK, about his problem with a
'parallel port' from a laptop, and wanting a 'serial port' to a modem.
My memory kicked into action when I read the replies from David, ZL3AI, and
Allen, ZL1UIC. I remembered how we used to do this conversion with our
home-made computers and modems years ago.
Here is an alternative suggestion. I started on packet with modems based on
7910 and 3105 ICs and 'Digicom' with a C64. What Rickie needs is a UART
(Universal Asynchronous Receive Transmit) IC and a timing clock, preferably
crystal controlled. I have one of these units, with a switch for selecting
serial output bit rates from 110 to 9600 bps. The AY-3-1015D UART was used
at one time, but the Motorola 6402 is another that comes to mind. These
devices are simply a parallel register and a clocked serial 'scanner' that
provides the RS232 COM-Port signals that David described in his bulletin.
These converters were available at one time, and maybe a computer store
would have them in stock, but that sort of do-it-yourself is now out of date,
and some searching may be required among computer experimenters.
Thanks to Allen and David for jogging my memory.
73. Dick. VK3ABK.
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