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From: marten@kuling.UUCP (M}rten Norman)
Newsgroups: comp.os.minix,comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: 75/1200 baud modem in software?
Message-ID: <1065@kuling.UUCP>
Date: 24 Jul 89 19:51:33 GMT
References: <431@tardis.Tymnet.COM>
Organization: DoCS, Uppsala University, Sweden
Lines: 23

From article <431@tardis.Tymnet.COM>, by jms@tardis.Tymnet.COM (Joe Smith):
> In article <1052@kuling.UUCP> marten@kuling.UUCP (M}rten Norman) writes:
>>As 1200/75=16 it _should_ be possible, if you are willing to fiddle with the
>>hardware registers. Just send 16 "1200-speed-bits" to represent a "75-bit".
>>The Hardware serial output register should agree with this, but i _dont_
>>think it's supported in standard software :-)
> 
> When you send 8 bits to an async line, the hardware sends 10 bits by
> adding a start bit and a stop bit.  Although one byte at 75 baud takes
> the same amount of time to transmit as 16 bytes at 1200 baud (160 bit times
> total), you can only specify 128 of the 160 bits.  The remaining 32 bits
> will screw up the receiver at the far end.
> 

You are _so_ right! I overlooked the START/STOP-bit "feature"...

Think I _should_ have done a double-check _before_ I launched some fake
hope :-)


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M}rten Norman          Email:marten@kuling.UUCP