22 Feb
2015
22 Feb
'15
7:06 p.m.
Well, I finally got back to the GNT 4601, and I'm still unable to get
it to work correctly. I'm using the following (null) cable, connected to
the DCE connector (the one on the corner):
DE9 DB25
--------------------
1 20
2 2
3 3
4 6,8
5 7
6 20
7 5
8 4
On the GNT 4601, FDX, DC Codes Off.
On the Linux side:
stty -F /dev/ttyS0 -a
speed 1200 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 =
<undef>; swtch = <undef>; start = ^Q;
stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread clocal crtscts
-ignbrk brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl -ixon
-ixoff -iuclc -ixany imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0
vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
-echoprt echoctl echoke
With these settings, nothing happens when I send chars to the punch
(cat > /dev/ttyS0). If I turn RTS/CTS off (-crtscts), the punch runs and
chars are punched, although I'm certain not all of them.
If I try and read a tape from the punch (cat /dev/ttyS0, press the Read
button on the punch), I get nothing on the Linux side. The tape reads a
short burst every time I press Read, but nothing ever shows up on the
terminal.
I'm beginning to the the 4601 has a problem, at least with the reader.
I've tried to duplicate a tape in Local mode, and nothing seems to be read
and nothing gets punched.
Feeling very frustrated.
On Fri, 6 Feb 2015, Simon Claessen wrote:
well I located the machine and it turns out that the
connector closest to the
corner is used. we made a nullmodem cable going to a db9 connector and we
grab the papertapes on a 600/1200 baud setting as handshaking is somewhat
broken on the pc side and we want to be shure to get al the bits. :-)
Our capture of pdp-8 tapes is here:
https://github.com/Hack42/Museum/tree/master/Papertape
On 02-02-15 16:05, Simon Claessen wrote:
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://q7.neurotica.com/Oldtech/
we have a 4601 and i've made a nullmodem
cable, but at the moment, I
cant to remember on which connector it went. i think is was the
connector going to the terminal, not the computer one. via the dip
switches on the bottom you can preset three speed settings, available at
a switch on the top. I will take a look wednesday when i'm back at the
museum.
simon
On 02-02-15 05:43, Mike Loewen wrote:
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
I have a box of old HP paper tapes to read,
and am having an awful
time trying to build the right serial cable to connect a GNT-4601
reader/punch to a Linux PC. Does anyone have a known good cable diagram
and stty settings that will work? Thank.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://q7.neurotica.com/Oldtech/