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2020-08-09Added the bitwise OR, left shift, and right shiftmrb0nk500
expressions to the emulator's assembler.
2020-08-08- Refactored the opcode table, in order to make themrb0nk500
instruction formatting simpler. - Refactored the instruction table of the emulator's assembler, it now has two parts, the addressing mode bits, and the base value. The base value is what's used to generate the actual opcode, with the addressing mode bits telling the assembler what addressing modes this instruction supports. The reason for doing this was to use less space. For comparison, the previous version used 870 bytes for the instruction table, while the new version uses only 222 bytes. The new version is nearly 4 times smaller than the pervious version. - The B register based ALU instructions now use their own addressing mode, and are specified by using 'b' as the operand for those instructions. For example, to add the Accumulator with the B register, you now use "ADC B" instead of "AAB".
2020-08-08Did a ton of stuff.mrb0nk500
- Changed the file structure of the SuB Suite, so that all variable declarations, symbols, and constants are in a single file. - Moved the C library functionss into a separate file, and made them use stack frames. - Added support for using the emulator's assembler for realtime debugging, to enter it, get in to stepping mode by pressing Ctrl+s, press any other key, then press F1, The reason for having to press some other key before pressing F1 is because it only allows entering the assembler when the keyboard is not ready. - Added the ".res" directive to the emulator's assembler, the ".res" directive tells the assembler to reserve however many bytes specified by the operand. - Fixed some bugs in the emulator's assembler.
2020-07-06- Implemented a new opcode table.mrb0nk500
- Added a new preifx called the OF prefix, which adds the contents of a specific register to the current operand. - Added a table generator, which parses opcode table csv files.
2020-06-22Did some more stuff.mrb0nk500
- Fixed some bugs in the emulator's assembler. - Worked on SuBAsm's lexer some more. - Created a new directory for the SuB suite, and moved all of the SuB suite's files in there.
2020-06-13Make the registers single 64 bit uints, and convertmrb0nk500
all the value getting, and setting into macros. This is to make the codebase cleaner.
2020-06-11Did some more stuff.mrb0nk500
- Fix some bugs with strings. - Started to refactor the instruction functions. - Added support for using RS prefixes on the memory based increment, and decrement instructions. - Started work on SuBAsm's lexer. Have fun looking at this, BieHDC. :)
2020-06-01Did some more refactoring to the assembler.mrb0nk500
- Refactored the symbol, and fixup table to now use a linked list - Added support for local symbols to the assembler. - Rewrote SuBEditor, and SuBAsm to use local symbols.
2020-05-30Refactored the assembler a bit more, in order to removemrb0nk500
code duplication. The assembler now uses pre-tokens, which are smaller tokens, that make up the larger tokens.
2020-05-28Refactored the assembler, yet again, and implementedmrb0nk500
support for comma separated values. The assembler now uses a linked list of tokenized lines, each containing a linked list of tokens for that line. I also moved all of the large tables into the higher parts of memory, in order to free up the lower part of memory for the user. Comma sepparated values only work with directives, and only with the byte", word, dword, and qword directives. I also added support for getting the upper, and lower halves of an address. The tokens for both of those are '<', and '>' respectively.
2020-05-18Fixed some more bugs in the assembler.mrb0nk500
2020-05-18Did alot of stuff while I was up at the family trailer.mrb0nk500
- Moved the large enums, and large tables into separate header files. - Added enums for implementing the base extension - Fixed a bug in the assembler. - Worked more on SuBAsm.
2020-05-09Added support for single quote marks to the emulator'smrb0nk500
assembler. Single quote marks works in the assembler just like they do in C, except that it only supports a handful of escaped characters, like '\n', and '\r'.
2020-05-06Removed some duplicate code in the assembler, and mademrb0nk500
the processor status register, a union now.
2020-04-27Added support for including source files to themrb0nk500
emulator's assembler. And removed three pointers, and the linewrap table from zero page, in SuBEditor. I moved the linewrap table to address $1000. And because of finally adding include support to the assembler, I can now start work on SuBAsm!
2020-04-19Removed most of the commented code, and optimized themrb0nk500
emulator some more. I optimized the emulator by replacing the main loop from a conditional while loop, to an unconditional for loop.
2020-04-17Made both the assembly language monitor, and themrb0nk500
emulator smaller, and faster. I am also starting to make SuBEditor's source code more readable.
2020-04-09Completely changed the assembler.mrb0nk500
It now has a lexer/tokenizer, along with a parser. I have also made the emulator even smaller.