3860 bytes per second on a 38400 bps line

From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2003-06-05 14:49:16

I released a new version of c2nload, the fastloader for my RS-232 based tape
drive emulator (http://www.funet.fi/pub/cbm/crossplatform/tranfer/C2N232/).
This version has two new features: the ability to disable automatic start-up
of the program, and the ability to load data to the RAM area $d000-$dfff on
the C64 and C128.  It also fixes a bug on the 264 series: there, tape file
names are 17 characters long, not 16.

I measured the transfer speed on the C64, C128, Vic-20 and plus/4 (not on
the PET, as my 8032 is a bit difficult to access).  Loading a 3-byte program
file takes almost 6 seconds.  Loading a file from $400 to $ffff on the
Commodore 64 takes 22.618 seconds real time (and virtually no user or system
time), measured with two different files copied from /dev/random.  The
transfer of the last 64511 bytes takes 16.709 seconds, which yields a transfer
rate of 3860.8 bytes per second.  I would have expected that a 38,400 bps line
with 8 data bits and one stop bit would only yield 3840 bytes per second.


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