NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/hp48/6886

Text File | 1993-01-11 | 1.6 KB | 37 lines

Newsgroups: comp.sys.hp48
Path: sparky!uunet!gatech!darwin.sura.net!spool.mu.edu!news.nd.edu!mentor.cc.purdue.edu!expert.cc.purdue.edu!vyainsm
From: [e-mail] (Sean Vyain)
Subject: HP48 <-> PC problems
Message-ID: <[e-mail]>
Keywords: serial cable
Sender: [e-mail] (USENET News)
Organization: Purdue University
Date: Mon, 11 Jan 1993 18:16:00 GMT
Lines: 25

    Hi!  I realize that the answer to my question has probably been
posted in the last couple months, but I can't find it anywhere at seq.uncwil.
I have a homemade hp48 to DB-25 serial connector.  The cable has been tested
with my hp48 and another IBM PC clone, and it DOES work (used mskermit 312).
I am, however, having trouble with my current setup:

    Tandy 1200HD (pause to let laughter and catcalls die down)
    "new" serial card configured as COM1, IRQ4, at \x03f8
    Have kermit and procomm

I can put the PC into a terminal mode and type strings that the hp48 will
receive through the sequence: BUFLEN DROP SRECV.  When the hp48 is in server
mode it will accept a FINISH command from the PC, but the PC hangs as if it is
waiting for an acknowledgement of the FINISH command.  I tried using XMIT to
send a string from the hp48 to the PC.  The hp48 claims successful transmission
(it returns 1 to the stack), but I get nothing on the PC end.
    I suspect that I need to tie some pin on the PC end to ground or +5V,
but I don't remember which one.  Right now TX is going to RX and vice versa, and
the signal grounds and chassis grounds are connected.  Also, the hp48 passed the
serial loop-back test.

    Any/All help welcome

    Sean Vyain
    [e-mail]