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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.
2020-05-29Make JSL, JSR absolute, and remove RTL.mrb0nk500
The reason for doing this was because JSL, and RTL are redundent, as they both do the same thing as JSR, and RTS.
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'.
2020-04-19Removed 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.
2020-04-02Made the emulator less bloated, and faster.mrb0nk500
2020-03-17Revamped the opcode table, made the emulator moremrb0nk500
efficient, and ported SuBEditor to C. I revamped the opcode table to add another prefix bit for the addressing mode, finally giving access to all addresses, without wasting any bytes. I made the stack based operations more efficient, by sort of applying Duff's device to it. And I ported SuBEditor to C, to make it easier for me to figure out how to implement SuBAsm.
2020-02-20Finished SuBAsm's screen editor.mrb0nk500
Which I am now calling, SuBEditor.
2020-01-23Start optimizing the emulator.mrb0nk500
I also added a new input testing program called input-3.s, which contains a mostly working editor.
2020-01-10Added GPLv2.mrb0nk500
We're now Free Software!!!
2019-12-24Added support for Indirect addressing modes, and allowmrb0nk500
for use of the B register as an operand, for ALU based instructions. This allows for both low code size, and high performance. This means we can save upto 9 bytes, by just using the B register for ALU operations, rather than using a memory address. The indirect addressing modes, give Sux the abillity to now use pointers. Hope you guys have a Merry Christmas! From mr b0nk 500 <b0nk@b0nk.xyz>
2019-12-19Fixed some bugs in both the assembly languagemrb0nk500
monitor, and the cursor movement routines for SuBAsm.
2019-12-19Added the B register, which is used for storing themrb0nk500
remainder during a DIV instruction. I also added the TAB, and TBA instructions, for transfering between the Accumulator, and the B register.
2019-12-18Start work on SuBAsm.mrb0nk500
Also added support for moving the cursor arround.
2019-12-17Revamped how the keyboard works.mrb0nk500
It now does not use an interrupt, although, in the emulator, it does act like an interrupt, when the keypoll macro is set to 0.
2019-12-14We now have keyboard support!!!mrb0nk500
I also added the WAI instruction, which puts the thread that executed it, into a catatonic stat, where it can't do anything, until an interrupt occurs. I will be starting work on GFsuX next. I also might start work on SuBAsm, the Sux Bootstrapping Assembler.
2019-12-13Added support for specifying the number of bytes asmrb0nk500
the suffix. I added this because BieHDC said the already existing notation glowed in the dark too much.
2019-12-11We can print to the Screen!!!!mrb0nk500
I also added the ASR instruction, for doing arithmetic shifts, and have added a hello world program.
2019-12-08Added support for resolving fixup labels.mrb0nk500
AKA, referencing a label before it has been declared yet.
2019-12-07Added support for labels to the assembly languagemrb0nk500
monitor. I also rewrote the fibonacci program to include lables.
2019-12-07Added six instructions for transfering datamrb0nk500
between the three main registers. These instructions are: TAY: Transfer Accumulator to Y. TAX: Transfer Accumulator to X. TYX: Transfer Y to X. TYA: Transfer Y to Accumulator. TXA: Transfer X to Accumulator. TXY: Transfer X to Y.
2019-12-06Delete opcode.c, since I added all the functionsmrb0nk500
from it into sux.c.
2019-12-06Finally got multithreading support working!!mrb0nk500
I have also added a program that computes the Fibonacci sequence that I wrote in Sux assembly.
2019-12-03Start optimizing the emulator.mrb0nk500
2019-12-02Added the ability to disable the prefix byte.mrb0nk500
Any instructions that either have a register size of 8 bits, use implied addressing, or branch can save a byte by disabling the prefix byte. It does this by checking if the first three bits are all set to 1. If true, then it will treat it as a prefix byte, otherwise, it will treat it as an opcode.
2019-11-30Start work on rev2 of Sux.mrb0nk500
Added a prefix byte to tell the CPU certain information such as, how many bytes to load into the registers, or what ISA extension we want to use. I also added an assembly language monitor, so that I don't have to write stuff in machine code.