20 Feb
2013
20 Feb
'13
11:01 a.m.
Am 20.02.2013 15:04, schrieb Allison:
Or an even better available 27128/256 etc. But this is
a controversal
proposal for some people on this list, as it deviates from the original
system. In times a VAX emulator runs on an iPhone, the 680b is simple
enough to run in almost any middle-sized FPGA, or anything in between to
the original system.
--
Holger
On 02/20/2013 04:17 AM, Holger Veit wrote:
There is no baudot TTY option its a 20ma serial loop option commonly
used for the asr33.
This was referred to in the listing as "Baudot".
You're right, this is
not 5 bit baudot/murray code. It is bit-banging tty, in contrast to an
ACIA, though.
Am 19.02.2013 23:52, schrieb Nick Allen:
> 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).
>
The 680 as far as I know does not autobaud so you need to know what
the console serial
card is set for and match that, likely much slower than 9600!
IS this running rom based monitor (turnkey) or the simpler front panel
machine
that needs software monitor loaded first to make it semi responsive.
Also,
anyone know where I can get the ROM files for a 680b?
What you have to set the
terminal to depends on the jumper settings
on the board. It also depends on the monitor itself - there is an
ACIA version which can work with 9600 8n1, but there is also a Baudot
TTY version.
There is a listing of the monitor and VTL-2 at
http://www.altair680kit.com/manuals/Altair_680-System_Monitor_Manual-03-Bet…
(toplevel page http://www.altair680kit.com/manuals.html).
Since the monitor is only 512bytes, it is IMHO not too tedious to key
in the hex codes. The problem is the availability of 1702 PROMs and a
suitable programmer nowadays.
Use an easily found (and programmed) 2716 or larger device and make an
adapter for the 1702 socket.