====== ASSIST 09 ======

ASSIST09 Command List (adapted from [[http://jefftranter.blogspot.com/2019/01/a-6809-single-board-computer.html|Jeff Tranter's SBC6809 project]])

^ Command ^ Arguments ^ Action ^
| B (reak) | <cr> | list break points |
| :::      | NNNN | insert break point |
| :::      | -NNNN | delete break point |
| :::      | - | delete all break points |
| C (all)  | <cr> | call routine at PC as subroutine |
| :::      | NNNN | call routine at NNNN as subroutine |
| D (isplay) | NNNN NNNN | display range mod16 |
| :::        | NNNN | display 16 bytes [NNNN]mod16 |
| :::        | M | display 16 bytes [M]mod16 |
| :::        | P | display 16 bytes [PC]mod16 |
| :::        | W | display 16 bytes [W]mod16 |
| :::        | @ | following NNNN, M, P, or W displays 16 bytes indirectly |
| E (ncode)  |   | Encodes a 6809 postbyte based on the addressing mode syntax |
| G (o) | <cr> | Go to PC |
| :::   | NNNN | Go to NNNN |
| L (oad) | | Load a S1-S9 format data |
| M (emory) | NNNN | Display memory data at address NNNN |
| ::: | <cr> | Terminate memory function |
| ::: | / | Display current byte with address |
| ::: | <lf> | Display next byte with address |
| ::: | caret | Display previous byte with address |
| ::: | , | Skip byte |
| ::: | SPACE | Display next byte |
| ::: |       | The / may be used as an immediate command. |
| ::: |       | After any of the display commands the memory contents may be altered by inputting a valid hex number or ascii 'string' enclosed by single quotes ('). |
| O (ffset) | NNNN NNNN | Calculate the two and/or three byte offset |
| P (unch)  | NNNN NNNN | Punch a S1-S9 format data |
| R (egister) | | Display 6809 registers and allow changes |
| ::: | <cr> | terminate command |
| ::: | SPACE | terminate value input or skip to next register |
| ::: | , | terminate value input or skip to next register |
| V (erify) | | Verify memory against S1-S9 format data |
| W (indow) | NNNN | Define a display window for the D and M commands. |
| Ctrl-X will abort any command. | | |

===== Post Byte Encoding =====
<file>        
                                R = X, Y, U, or S
                                Direct Addressing Modes
                                ------ ---------- -----
                                     ,R         A,R
                                    H,R         B,R
                                   HH,R         D,R
                                 HHHH,R         ,-R
                                   HH,PCR       ,--R
                                 HHHH,PCR       ,R+
                                                ,R++

                                Indirect Addressing Modes
                                -------- ---------- -----
                                    [,R]        [A,R]
                                                [B,R]
                                  [HH,R]        [D,R]
                                [HHHH,R]
                                  [HH,PCR]      [,--R]
                                [HHHH,PCR]
                                [HHHH]          [,R++]
</file>


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