gessel@masada.cs.swarthmore.edu (Daniel Mark Gessel) (01/21/91)
The old NeXT's used rs 422. Now they use rs 423. 423 is some where in between 232 and 422 in terms of max cable length. I expect their pinout is standard for 423. I think they should have stuck with rs 422. No idea why they changed. Dan -- Daniel Mark Gessel Independent Software Consultant Internet: gessel@cs.swarthmore.edu and Developer I do not represent Swarthmore College (thank God).
datran2 (01/22/91)
In article <GESSEL.91Jan21104725@masada.cs.swarthmore.edu> gessel@masada.cs.swarthmore.edu (Daniel Mark Gessel) writes: >The old NeXT's used rs 422. Now they use rs 423. 423 is some where in Hardware flow control. This is one of the two major improvements in the new board IMHO. My high speed modems are working much faster and and more reliably now than with the old motherboard. Steve. -- #====#====#====#====#====#====#====#====#====#====#====#====#====#====#====# # Steve Boker # "Badgers, we don't have no stinking badgers" # # datran2!smb@csn.org # -from Treasure of the Sierra Madre Zoo # #====#====#====#====#====#====#====#====#====#====#====#====#====#====#====#
amarcum@next.com (Alan M. Marcum) (01/22/91)
madler@pooh.caltech.edu (Mark Adler) in <1991Jan19.224552.14895@nntp-server.caltech.edu>: > Also, does anyone know if any Mac's?wire RTS and CTS like the 040 NeXT's. > Maybe it's not so non-standard. Last I checked (a few months ago) I found at least six different "Mac-Modem" cables. For example, I've seen different cables with one (or more) of the following: Signal DB-25 MiniDIN CTS 5 2 DSR 6 2 DTR 20 2 DCD 8 2 RTS 4 1 One cable had both DSR and DCD connected to MiniDIN Pin 2. The specs for a modem cable on both 030 and 040 NeXT machines are to have DCD, Pin 8 on the DB-25, connected to MiniDIN Pin 2. In order for /dev/cua (for example) to work, Pin 2 must see a signal which reflects the presence or absence of a remote carrier. Typically, this will be DCD (assuming correct modem setup). If you want hardware flow control, I doubt strongly whether you'll find a Mac-Modem cable which meets NeXT's pin-out specifications. All this is documented in the UNIX Manual Pages under zs [zs(4) for the UNIX types], along with the interlocks between cuX (dial-out) and ttydX (dial-in). For now, yes, you'll either have to build your own cable or have a custom cable vendor build it for you. No, this is not an ideal situation. For those wondering, for those without UNIX manual pages available for our system, here are the modem cable specs from the manual page. Note that the zs manual page included in the 2.0 version of the Network and System Administration Manual is the 1.0, not the 2.0, manual page. The cable spec in the manual page in the Admin Manual shows the correct pin-outs for a 68030-based computer (with the caveat the MiniDIN Pin 2 SHOULD be called DCD, not CTS). Also, the modem cable for a 68040-based computer is specified in Chapter 13, Attaching Peripheral Devices. 68030-to-modem (no flow control available) MiniDIN-8 DB-25 1 DTR 20 DTR 2 DCD 8 DCD 3 TxD- 2 TxD 4 GND 7 GND 5 RxD- 3 RxD 6 TxD+ -not connected- 7 RTxC/+5V -not connected- 8 RxD+ 7 GND (Note that on the 68030-based machines, Port A's Pin 7 is RTxC while Port B's Pin 7 is +5 volts.) 68040-to-modem MiniDIN-8 DB-25 1 DTR 20 DTR 2 DCD 8 DCD 3 TxD 2 TxD 4 GND 7 GND 5 RxD 3 RxD 6 RTS 4 RTS 7 RTxC -not connected- 8 CTS 7 CTS -- Alan M. Marcum NeXT Technical Support amm@NeXT.COM
anderson@dogie.macc.wisc.edu (Jess Anderson) (01/22/91)
In article <206@rosie.NeXT.COM> amm@NeXT.COM (Alan M. Marcum) writes:
[about modem connections for 1.0 and 2.0]
Seems like a time to acknowledge, after posting my lectures
on how to do business right :-), that NeXT people are putting
in some appearances here, and to express gratitude for it.
In addition, after I posted my question about nslookup, I
got email from two different NeXT employees pointing out
that it's included in 2.0 and that I had missed finding it
(in /usr/etc). Since real problems merit public complaints,
it seems only fair that real solutions merit public thanks.
--
Jess Anderson <> Madison Academic Computing Center <> University of Wisconsin
Internet: anderson@macc.wisc.edu <-best, UUCP:{}!uwvax!macc.wisc.edu!anderson
NeXTmail w/attachments: anderson@yak.macc.wisc.edu Bitnet: anderson@wiscmacc
Room 3130 <> 1210 West Dayton Street / Madison WI 53706 <> Phone 608/262-5888amm@NeXT.COM (Alan M. Marcum) (02/14/91)
In <206@rosie.NeXT.COM> I wrote: > 68040-to-modem > MiniDIN-8 DB-25 > 1 DTR 20 DTR > 2 DCD 8 DCD > 3 TxD 2 TxD > 4 GND 7 GND > 5 RxD 3 RxD > 6 RTS 4 RTS > 7 RTxC -not connected- > 8 CTS 7 CTS Oops, there's a typo in this. Pin 8 on the MiniDIN side should NOT be connected to Pin 7 on the DB-25 side. It SHOULD be connected to the CTS signal, which is Pin 5 on the DB-25. So, the correct spec is: 68040-to-modem MiniDIN-8 DB-25 1 DTR 20 DTR 2 DCD 8 DCD 3 TxD 2 TxD 4 GND 7 GND 5 RxD 3 RxD 6 RTS 4 RTS 7 RTxC -not connected- 8 CTS 5 CTS Note that the on-line zs(4) man page is correct. --- Alan M. Marcum NeXT Technical Support amm@NeXT.COM