But since all I need is the /TXD, TXD, /RXD, RXD for a serial console,
the handshaking/clock is unecessary...right? I'm not trying to set up
a localtalk network through the serial port...although Linux might be
able to do that (I'll have to check that out).
Hmmm...I wonder if one could set up 68k Mac as serial terminals to an
OS X box using the Keyspan USB dongle? I know you can't use them as
localtalk adapters (aww...) but you might be able to use them as serial
terminals using getty or something like that, right?
Jack
On Sep 12, 2005, at 11:27 AM, Doug McNutt wrote:
I do hope others on this list are enjoying this. If it's off topic we
should take this off line. Anything that uses RS (radio standard)
specs is interesting history to me.
The pins you report below don't exactly match RS-232 standards. I am
making the assumptions added on the right after a #
At 17:53 -0500 9/11/05, Jack Gallemore wrote:
The 8-pin mini to DB-9 null cable worked with the 8-9 Teleport modem
cable using Z-Term. The Color Classic is now managing a classic Sun
workstation. In fact, this box will support Solaris 9 (probably will
have to use 16Mb SIMMs). This is what Sun has for the 8-pin serial
pinouts:
1 - DTR # An output line from the Sun, data terminal ready,
2 - TXC # Probably provision for external clock to set baud rate
3 - TD # Transmitter in the Sun for data called TxD in RS-232
4 - GND
5 - RD # Receiver in the Sun for data called RxD in RS-232
6 - RTS # Request to send hardware handshake from Sun
7 - DCD # Data carrier detect into Sun used for speed control with
high speed modems
8 - RXC # Probably provision for external clock to set baud rate
The IPC has a jumper to switch from RS-232 to RS-423.
Missing is the usual CTS signal, Cleared To Send, which would be an
input to the Sun
In fact there seems to be no receiver in the Sun for any form of
handshake. 'Tis strange.
RS-423 appears to be a higher power version of RS-232. It's nothing
like RS-422 which Apple uses. RS-423 can drive 10 receivers, for
instance, rather than the one receiver for RS-232. The pinouts must be
the same <http://www.rs485.com/rs485spec.html> was the first hit on
Google. You should use the RS-232 jumper.
This is the best I can do without a whole lot more information on the
Sun interface. The handshaking is a potential problem because there
seems to be no receiver in the Sun to accept a Hsk-out command from
the Mac. If you can set the Sun and the Mac to use software
handshaking the connection will be slower but the handshaking
connections in the cable will be ignored. Blank spaces indicate no
connection.
You should be able to cut the covering from an Apple serial cable in
the middle and splice or cut wires to make a Sun end. You'll need a
continuity tester or ohmmeter with an insulation piercing pin to
identify the colored wires. Several wires do not need to be cut. Be
sure to mark it. We don't want the cable plugged in backwards.
If the Sun requires a clock input on TXC and/or RXC we're in serious
trouble. My guess is that Sun UNIX can set up to use standard rates
possibly in the terminfo file.
Sun MiniDIN Mac comment
1 DTR 2 Hsk in Handshake to Mac
1 Hsk out Handshake from Mac
3 TD 5 RxD- Data to Mac
4 GND 4 GND Logic ground
5 RD 3 TxD- Data from Mac
4 GND 8 RxD+ Ground the Rs422 RxD+ line
6 TxD+ Ignore RS422 TxD+ from the Mac
7 GFI Carrier detect if Mac is a server
7 DCD Carrier detect
2 TXC clock
8 RXC clock
6 RTS from Sun
shell CHASSIS shell CHASSIS Overall shield
Rferences:
<http://www.cisco.com/en/US/products/hw/routers/ps133/
products_tech_note09186a00801f5d8c.shtml>
Talks about TXC and RXC in conjunction with RS-449. Donno if it
applies here.
<http://www.cs.biu.ac.il/cgi-bin/man?syncinit+1M>
is a UNIX man page that uses RXC and TXC as clock lines that allow the
baud rate to be set. This would be for synchronous communication. No
early Macs had the capability except perhaps for early server
software.
<http://docs.sun.com/app/docs/doc/816-0211/6m6nc678g?a=view>
indicates that Sun does in fact have synchronous capability on its
serial ports.
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