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HEPAX Module

HEPAX Modules The HEPAX module HEwlett-PAckard 41 eXpansion module is a very powerful expansion of your HP-41 system. In effect, it lets you create your own application modules, you can use data and text files exactly like in the Extended Functions module, you get all the functions of the XF module and you can save key assignments and entire calculator memory exactly like with the HP-IL module and a mass storage device.

File System Functions

HAPPCHR Appends the characters in the ALPHA register at the end of the record at the pointer in the current HEPAX text file.
HAPPREC Appends the contents of the ALPHA register as a new record at the end of the current HEPAX text file.
HARCLRC Appends the record at the pointer in the current HEPAX text file to the ALPHA register.
HASROOM Returns the number of characters left in a HEPAX text file.
HCLFL Clears the contents of a HEPAX data or text file. The file is not deleted.
XXX Appends the record at the pointer in the current HEPAX text file to the ALPHA register.
HCRFLAS Creates a HEPAX text file.
HCRFLD Creates a HEPAX data file.
HDELCHR Deletes a number of characters from the current HEPAX text file, starting at the pointer.
HDELREC Deletes the record at the pointer from the current HEPAX text file.
HEPDIR Lists all files in the HEPAX file system.
HEPDIRX Lists one files in the HEPAX file system.
HEPROOM Returns the number of registers available in the HEPAX file system.
HFLSIZE Returns the size of a HEPAX file.
HGETA Recalls the contents of entire calculator main memory from a HEPAX "write-all" file.

The Extended Functions Multi-function

To execute an Extended Functions Multi-function, execute the XF function and enter the multi-function number or execute the XFA function and press ALPHA, enter the multi-function name and press ALPHA.

Name Number Function
ALENG 000 Returns the length of the string in ALPHA.
ANUM 001 Converts the string in ALPHA to a numerical value in X.
AROT 002 Rotates contents of ALPHA.
ATOX 003 Converts a character in ALPHA to a character code in X.
CLKEYS 004 Clears all key assignments.
CLRGX 005 Clears registers as specified by X.
GETKEY 006 Gets keycode depending on key pressed.
GETKEYX 007 Gets keycode within time specified by X.
PASN 008 Programmable assignment.
PCLPS 009 Programmable clear programs.
POSA 010 Finds position of string or character in ALPHA.
PSIZE 011 Programmable SIZE.
RCLFLAG 012 Recalls the status of user flags 00-43.
REGMOVE 013 Moves a block of main memory data registers.
REGSWAP 014 Swaps two blocks of main memory data registers.
ΣREG? 015 Returns the location of the statistical registers.
SIZE? 016 Returns the current SIZE.
STOFLAG 017 Restores the status of user flags 00-43.
X<>F 018 Exchanges the status of user flags 0-7 with the X register.
XTOA 019 Converts character code in the X register to a character in the ALPHA register.
X=NN? 020 Compares X with indirect Y.
X≠NN? 021 Compares X with indirect Y.
X<NN? 022 Compares X with indirect Y.
X≤NN? 023 Compares X with indirect Y.
X>NN? 024 Compares X with indirect Y.
X≥NN? 025 Compares X with indirect Y.

HEPAX Advanced Functions

CLRAM Clears a whole or part of a 4K block of HEPAX memory.
CODE Codes the hexadecimal string in the ALPHA register and places result in the X register.
COPYROM Copies a whole or part of a 4K block of system memory to HEPAX RAM.
DECODE Decodes the contents of the X register and places result in the ALPHA register.
DECODYX Decodes a number of nybbles as DECODE.
DISASM Disassembles HP-41 M-Code.
"DISSST" FOCAL program that disassembles HP-41 M-code line by line. Program listing on page 67 in the Owner's Manual.
HEXEDIT Edits HEPAX memory word by word.
HPROMPT Prompts for a number of hexadecimal digits.
"JUMP" FOCAL program that calculates HP-41 M-Code absolute jump instructions. Program listing on page 127 in the Owner's Manual.
RAMTOG Toggles write protection status of a ROM image.
READROM Reads a number of ROM images from Mass Storage.
WRTROM Writes a number of ROM images to Mass Storage.

The HEPAX Multi-function

To execute a HEPAX multi-function, execute the HEPAX function and enter the multi-function number or execute the HEPAXA function and press ALPHA, enter the multi-function name and press ALPHA.

Name Number Function
AND 001 Logical X AND Y.
BCAT 002 Block catalog.
BCD-BIN 003 Converts number in X from BCD to binary.
BIN-BCD 004 Converts number in X from binary to BCD.
CTRAST 005 Sets display contrast ("Halfnut" calculators only).
DELETE 006 Works like DELETE of the hexadecimal editor.
INSERT 007 Works like INSERT of the hexadecimal editor.
NOT 008 Complement of X.
OR 009 Logical X OR Y.
ROTYX 010 Rotates Y register X nybbles.
SHIFTYX 011 Shifts Y register X bits.
XOR 012 Logical X exclusive-or Y.
X+Y 013 Bitwise addition.
X-$ 014 Converts X register to alpha string.
Y-X 015 Bitwise subtraction.