20 Feb
2013
20 Feb
'13
10:19 a.m.
On 2/20/2013 5:59 AM, Allison wrote:
On 02/20/2013 07:47 AM, Bill Sudbrink wrote:
Nick,
have you looked to see that the levels are anywhere near the correct
levels when connected to the 680? I don't know about the unit you have,
but I'd be sure that you have +- 10v or so when you are connected. I
would think that there would be a > 0 chance that they cheat on the
level and drive on the USB -> serial ports.
jim
Nick Allen wrote:
I've used a FTSB USB to serial for connect to several macines, I do have
several adaptors to get te right levels and connector as the cable I have
is 3.3V LVCMOS. Other than the correct levels there are no issues.
I have no idea where the Baudot thing comes from as those terminals were
rarely used with micros and the standard asr-33 and adm/vt05/vt52/H19
terminals were all ascii.
Most of the serial USB to serial cables need a driver to match the OS to
the cable. Linux you use minicom and the correct ttyUSB port.
Note the cable must be able to do slow rates like 110, 300, 600,1200
as most of the older machines will generally not keep up with 2400
or faster (for most modem programs).
Allison
Allison
anyone ever use a USB/Serial cable to connect to
an Altair? I am trying
to connect my 680b to my windows 7 computer via hyper-terminal to no
avail. Any special settings I should be aware for terminal settings
(currently using 9600, 8 data bits, 1 stop bits, NONE for parity and
flow control).
Also, anyone know where I can get the ROM files for a 680b?
Have you examined the
680 schematics (available on the web)?
A 680 can be configured in a number of ways, including various
baud rates, signaling schemes (rs-232 is just one of three
choices) and the firmware may be ASCII or Baudot. You need to
do much more investigation than "just plug it in".
Bill S.