cisc-0.2 - An emulator for the Sux instruction set.

Age	Commit message (Collapse)	Author
2021-02-25	- Implemented the multiply expression into the assembler.	mrb0nk500
	- Implemented support for the SIB addressing mode into the assembler. SIB is short for "Scale Index, and Base", and works much like x86's version of SIB (scale*index+base), although my version supports any scale value between 1, and 256. - Redid the line shifting routine in SuBEditor. It now uses memcpy, and memset to do that, and also supports shifting the line left, or right by any number of characters.
2021-01-27	- Fixed some bugs in the emulator.	mrb0nk500
	- Started work on implementing the Super VIA emulation. - Added support for disabling disassembly per instruction, when in debug mode. - Did some more work on rewriting the SuB Suite to work with the new calling convention. - Rewrote the symbol handling code in the emulator's assembler, to make it both simpler, and to add support for arbitrarily deep symbol scopes. - Added support for arbitrarily deep local symbol scopes. For example, to declare a symbol of depth 2, you add two '@' characters to the start of the symbol name. In other words, the number of '@' characters before the symbol name is what determines the scope of that symbol. And to use a symbol thats outside the current scope, you would use the same syntax as using a struct member, so you would do `global.local`.
2020-12-08	- Implemented support for the Orthogonal extension into	mrb0nk500
	both the assembler, and the emulator. I finally figured out how I could get support for the Ortho extension implemented into the old assembler. The only reason for doing this, is to buy me some while I start work on the new assembler, and to help me get an idea for how to do the same in the new assembler.
2020-11-20	- Cleaned up a bit of the code.	mrb0nk500
	- Made the debug print for the CPU flags more readable. - Started work on implementing line number support into SuBAsm.
2020-10-04	- Added support for reading, and writing outside the	mrb0nk500
	emulator's memory. All reads outside of the emulator's memory give back $/0xFF bytes, while all writes outside of the emulator's memory are ignored. - Implemented malloc(), and free() in the SuB Suite. In order to do this, I had to add support for a heap, which I did by reserving the first 3 banks of the address space (the first 192K), and by adding a routine that finds the end of the RAM. In this case, I set the starting address for the routine at bank 3 (bank 4 with one indexing), but, the routine's starting address isn't hardcoded, and thus, any starting address can be passed as an argument. The routine uses the fact that we can now read/write outside the emulator's memory, and also uses the fact that writing outside the emulator's memory will be ignored, and that reading outside the emulator's memory will always read $/0xFF bytes, and uses that to signal that it's reached the end of the RAM. - Added a test program for getting the size of RAM starting at address $/0x20000.
2020-09-24	- Fixed some more bugs with struct, and union handling.	mrb0nk500

2020-08-30	- Did some more work on SuBAsm's lexer.	mrb0nk500
	- Optimized the memory read, and write functions. - Made the emulator faster, and cleaner in general.
2020-08-17	- Fixed some bugs in the emulator's assembler.	mrb0nk500
	- Simplified the effective address functions. - Made SuBEditor a bit faster. - JSR, and RTS now support using the RS prefix, which is used to specify the return address size, with an RS prefix of 0 being a return address size of 64 bits, rather than 8 bits.
2020-08-08	- Refactored the opcode table, in order to make the	mrb0nk500
	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".
2020-08-08	Did 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.
2020-06-22	Did 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.