Alternative Hardware Design for Floppy Interface
cc at corti-net.de
Sat Oct 20 14:20:02 CDT 2007
On Sat, 20 Oct 2007, Patrick Finnegan wrote:
> On Saturday 20 October 2007 13:00, e.stiebler wrote:
>> or read from a valuable floppy, I can wait a minute to transfer it
>> via V24 which most computers have. (Please don't kill me for this
> I think you mean "RS-232", or more properly, "EIA-232". V.24 comprises
> a part of the EIA-232 standard, but is only really a pinout
I think you're wrong. There is no pinout specification at all in V.24, in
contrary to RS-232 which specifies DB-25 connectors (and nothing else).
And while you can have current loop or voltage levels for your signals
with V.24, RS-232 is voltage levels only. So V.24 can be considered more
versatile than RS-232 in that it really only specifies the function, not
the signalling (that's part of V.28) nor the connectors (like ISO 2110).
So most serial ports (what most of us call "serial port") are V.24 ports,
but only some of them are RS-232. For example: a teletype ASR33 attached
to a PDP-8 will be V.24 but not RS-232.
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