Date : Fri, 14 Jun 1991 05:05:26 GMT
From : baron!baron!pnet07!donm@nosc.mil (Don Maslin)
Subject: Re: Need some help with PINOUTS
tericks@plains.NoDak.edu (Terry Erickson) writes:
> I have a question about a NEC APC.
>
> I am trying to hook up a modem to that computer, BUT its port on the
>back is no normal Serial Port, it looks more like the Centronics Parallel
>Printer port (Cent 36 I think) instead of a DB25. And I seemed to have
>misplaced my manuals for the pinouts on that type of Serial Port, could
>anyone give me some assistance??
> That way, with a little help from a Jumper Box and a normal Parallel
>Printer cable, I could have Modem Communications.
Following is a tabulation of:
Table 3-20
Serial I/O Connectors Pin Assignments
Pin # Pin # Pin #
Signal at A at B at C Remarks
-----------------------------------------------------------------
Frame Ground 1 1 1
SD 2 2 3 Send Data
RD 3 3 5 Receive Data
RS 4 4 7 Request to Send
CS 5 5 9 Clear to Send
DR 5 5 11 Data Set Ready
Signal Ground 7 7 13
CD 8 8 15
---------------------------------------------------
9 9 17 No Signal
10 10 19
11 11 21
12 12 23
13 13 25
14 19 2
---------------------------------------------------
ST2 15 20 4 Transmit Clock (TxC)
---------------------------------------------------
16 21 6
---------------------------------------------------
RT 17 22 8 Receive Clock
---------------------------------------------------
18 23 10
19 24 12 No Signal
---------------------------------------------------
ER 20 25 14 Data Terminal Ready
---------------------------------------------------
21 26 16
22 27 18 No Signal
23 28 20
---------------------------------------------------
ST1 24 29 22 Transmit Clock (RxC)
---------------------------------------------------
25 30 24 No Signal
---------------------------------------------------
NOTE: 'A' is at the modem connector
'B' is at the back panel connector
'C' is at the processor board header
I infer that the serial connector is the right hand one, but I'm not
sure.
Hope this helps.
- don
Keeper of the CP/M System Disk | UUCP: {nosc ucsd crash ncr-sd}!pnet07!donm
Archives for the Dino(saur)SIG | ARPA: simasd!pnet07!donm@nosc.mil
- San Diego Computer Society - | INET: donm@pnet07.cts.com
End of INFO-CPM Digest V91 Issue #112
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