Path: utzoo!utgpu!watmath!isishq!f171.n221.z1.FIDONET.ORG!izot
From: izot@f171.n221.z1.FIDONET.ORG (Geoffrey Welsh)
Newsgroups: comp.sys.cbm
Subject: Re: Another info request for old CBM computers
Message-ID: <1347.23DEB744@isishq.FIDONET.ORG>
Date: 25 Jan 89 00:07:31 GMT
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 > From: jgreco@csd4.milw.wisc.edu (Joe Greco)
 > Message-ID: <527@csd4.milw.wisc.edu>
 >
 > No! No!  Not 6809... please.  I haven't been able to get my hands on a
 > copy of DYTTY, so if you can find one it would be much appreciated.
 
   I have no idea why you don't like 6809... it's like 6502's big brother 
and (what I like most about it) it's just as fast as 6502 (i.e. machine cyles 
per instruction, by which standard the 8086 and 68000 family look poor in 
comparison). It offers 16-bit accumulator, X and Y, system & user stacks (not 
limited to 256 bytes), direct page (relocatable zero page, emulated by the 
C128's 8502/MMU), 8-by-8 bit multiply, etc...
 
 > Well, I'd use 9600 "just on principle" (the faster the modem help
 > menus come up, the less inclined I am to reach for a manual).
 
   By the time you compare 4800 to 9600, you have to ask yourself (1) can the 
display routines really keep up to 9600? (2) How much are they slowed down by 
the 9600 interrupts/second as compared to the 4800 interrupt/second?
 
 > I have not seen your routines, unless you mean FASTERM, which does
 > manage 2400 but not anything faster.
 
   I managed C1 and XMODEM transfers (error-free) at 4800 bps using that code. 
A 2-MHz C128 port of the code runs a USRobotics HST at 9600.
 
 > (besides, I still want to see Kermit run at 2400... or 9600...
 
   Kermit, like and all half-duplex protocols, profits less and less from each 
succeding increase in baud rate. XMODEM, for instance, only achieves 400 
bytes/second transfer rate on an 11,600 bps data carrier. YMODEM improves that 
to 700 bytes/sec by increasing block size from 128 bytes to 1K. Kermit's block 
size is usually 92 bytes, meaning that its throughput would be even worse than 
XMODEM's.
 
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