Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-pcd!hpcvra!rnews!hpcvbbs!akcs.michaelv
From: akcs.michaelv@hpcvbbs.UUCP (Michael VanLoon)
Newsgroups: comp.sys.handhelds
Subject: Re: HP48SX RS-232 Port & ROM Ver
Keywords: HP48SX, ROM, RS-232, serial
Message-ID: <271d608b-384.1comp.sys.handhelds-1@hpcvbbs.UUCP>
Date: 18 Oct 90 08:40:11 GMT
References: <13241@sdcc6.ucsd.edu>
Lines: 16

ROM version:

     (Calculator is turned on already...)
     ON-D
     <-  (the backspace key with DROP/CLR above it)
     EVAL
     ON-C  (this returns to stack [which is cleared BTW])

Serial port:

     (Looking at calculator top, from left to right)
     1) Shield, 2) Transmit, 3) Receive, 4) Signal ground

Hope this helps...

Michael V