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                       HP82478A HP-71 Debugger   9/01/86

The debugger is a RAM-based program of less than 12K bytes which resides
in HP-71 memory along with the target assembly language. It is designed 
in three modules, comprising four files which can be copied into and out 
of memory as desired.

The debugger is compatible with the HP-71 operating system, and may reside in 
memory without affecting the operating characteristics of the computer. 
Activating the debugger places the HP-71 operating system in a state of 
suspension, where individual CPU registers and memory locations can be 
examined and edited. Assembly language routines can be emulated with 
interrupt, single step, and break point capability. The HP-71 keyboard is 
used to direct the debugger, and output may be sent to both the LCD and an 
HP-IL display device.

The debugger system consists of four LEX files:

 o DBGMAINA: 
   The debugger's response to the VER$ function ("DBG:A").

  -DBGADDR$, for ascertaining base addresses for the DBGLEX files;
  -DDISPLAY IS, to set up the debugger HP-IL display device.

   This file MUST be loaded.

 o DBGLEX1A and DBGLEX2A: two LEX files which contain the core of the debugger
   system, including RAM storage, CPU emulator, and input/output routines.

   This file MUST be loaded.

o DBGLEX3A

  -Disassembler, to display opcode mnemonics.
  -80 column interface for the HP-IL display device.
  -Adjustment of displayed addresses to match listings.
  - Extended command menu.

The 82478A Debugger contains a FORTH/Assembler ROM, manual, Debugger software
on a 3.5 inch HP-71 formated disc, and a 5.25 inch MS-DOS formated disc (for 
use with HP82477A HP-IL LINK software- HP-71 <--> MS-DOS Personal Computer
Link).

The Debugger upgrade kit (82478-60001) contains everything with the exception 
of the FORTH/Assembler ROM and manual.


Hewlett-Packard
Calculator Technical Support
1000 NE Circle Blvd.
Corvallis, OR 97330
(503) 757-2004
8:00am - 3:00pm PST Mon-Fri.