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Serial port downloads from (Linux) PC to HP-41
Posted by Tony Duell on 10 Feb 2001, 2:59 p.m.
Here's my file on downloading from a (linux) PC to an HP41 using the serial interface and extended I/O module. You'll have to modify the PC configuration instructions for your OS, but I can't tell you how to do it...
This document describes how to use the HP82164 HPIL-RS232 interface to connect an HP41 calculator (fitted with the HP82160 HPIL interface and the Extended I/O module) to a Linux PC, and to transfer programs in both directions between them.
Throughout this document, the PC's serial port will be named /dev/cua0 . Change this as appropriate, of course.
The jumper plug inside the HP82164 interface should be set to the DTE position. See the interface's user manaul for more details of this.
Connect the HP82164's RS232 port to the PC using a standard PC modem cable and a special adapter. The latter is needed owing to the rather strange hardware handshaking of the HP82164, and the following diagram gives the necessary wiring :
PC HP82164 (DB25-S) (DB25-S)
Prot Gnd 1 )-------------------( 1 Prot Gnd
TxD 2 )-------------------( 3 RxD
RxD 3 )-------------------( 2 TxD
RTS 4 )-------------------( 5 CTS
CTS 5 )-------------------( 20 DTR
DSR 6 )--+----------------( 4 RTS | CD 8 )--+
Sig Gnd 7 )-------------------( 7 Sig Gnd
DTR 20 )----------------+--( 6 DSR | +--( 8 CD
On the PC, turn off buffering and enable hardware handshaking by typing :
stty raw crtscts </dev/cua0
On the HP41, load the SETRS program and run it to set the HP82164 interface to hardware handshake mode and to make it the primary device. A binary file of this program is given in hardware/setrs.p41 in the lif_utils distibution, and is given as a listing below :
0001 LBL "SETRS" 0002 66 0003 FINDAID 0004 SELECT 0005 CF 17 0006 REMOTE 0007 "SL2" 0008 OUTA 0009 "LI5" 0010 OUTA 0011 "C0" 0012 OUTA 0013 NOTREM 0014 END
On the PC type :
inp41 < /dev/cua0 >program_file
where program_file is the filename that you want the binary program stored in. Alteratively you can pipe the output of inp41 to prog41 to get a text listing by typing :
inp41 < /dev/cua0 | prog41
On the HP41:
Put the name of the program to send (or more exactly one of the global labels in that program) in the alpha register.
Then execute : OUTP
When the program has transfered, the PC should display
and the program will be stored in the specified file
On the PC type :
outp41 < program_file >/dev/cua0
where program_file is the name of a file containing an HP41 program.
The input to outp41 can be piped from lifget (for example) in the standard way to transfer a file from a lif disk image. For example :
lifget -f disk1 PROG | outp41 > /dev/cua0
will transfer the file PROG from the lif disk image disk1.
On the HP41:
GTO .. to pack program memory and create a dummy program at the END.
then execute : INP
When the program has transfered, the X-register display will return. CAT 1 to check that the program has loaded.
A. R. Duell, 2-Oct-2000.
This file is part of the LIF Utilities distribution and has been placed under the GNU Public License version 2.0
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