There was no ethernet usb or wif.
Rs232 breakout box schematic.
There are 10 interface signal powered leds to permanently monitor td rd rts cts dsr cd tc rc dtr e tc and two leds for spare.
The normal units only come in the db25 size but with a couple of db9 to db25 adaptors they can be used with db9 cables as well.
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An rs232 break out box.
Back in the old days of eight bit computers such as the commodore 64 apple trs 80 and the atari among others the only way to transfer data between computers was either a modem or a much coveted rs232 interface.
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This following is a device which is inserted between the dte and dce.
Firstly it allows you to monitor the state of the various hand shaking lines light red signal on green off and watch the serial data flicker on td and or rd.
Such a device is particularly useful in solving interfacing problems.
Get it as soon as thu oct 8.
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Batteryless pocket sized for circuit testing monitoring and patching.
Db9 serial break out cable.