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SITU-SOL
========

SITU-SOL is a programming environment for 6502-based computers that was
written by hand during RetroChallenge 07/2015.

For more information, see the posts to the Bootstrap Zero blog, archived
in this repo in [doc/bootstrap-zero/README.md](doc/bootstrap-zero/README.md).

While SITU-SOL is quite generic, an emulated Commodore 64 was used to
host it and test it during its development, so many of the instructions
below are specific to the C64.

Supporting tools
----------------

This repository contains the following supporting tools, written in
Commodore BASIC 2.0:

*   `binloader`, the first version of the simulated bit-entering facility,
    used in the warm-up
*   `frontpanel`, the improved version of the front-panel simulator,
    used to enter SITU-MON.  (This tool is also now known as SITU-PAN.)

BASIC sources for these are in `src`; the tokenized PRG files are in `bin`.

Note that these programs begin writing to memory at $8100, which is normally
inside the memory range that BASIC will also use — thus you are in danger of
BASIC overwriting what you enter with its own variable data.  So, to safely
run either of these programs, you should do something like this:

    POKE 56,128:NEW
    LOAD "FRONTPANEL",8
    RUN

Memory images
-------------

*   `situ-mon` is a PRG file containing a dump of what memory $8100-$81FF
    looked like just after SITU-MON was entered and fixed.  You can run
    it from BASIC immediate mode like so:
    
        LOAD "SITU-MON",8,1
        SYS 33024
        
*   `situ-sol` is a PRG file containing a dump of what memory $8100-$8520
    looked like just after SITU-SOL was entered and fixed.  It also includes
    SITU-MON — because SITU-SOL calls routines from it — and 256 bytes of
    almost-unused code between $8200 and $82FF.
    
    It can be started from BASIC immediate mode like so:
    
        LOAD "SITU-SOL",8,1
        POKE 2304,0:SYS 33830
    
    But!  There is no symbal table.  (The `POKE 2304,0` is to stop SITU-SOL
    from mistakenly behaving as if there's a symbal table at that address,
    in case that byte isn't zero.)  You may wish to load a symbal table
    first, but I haven't got one handy, yet.

Other things
------------

This repository might, at some point, also contain text files containing
disassembled machine code that was entered.