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- 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.
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all the value getting, and setting into macros.
This is to make the codebase cleaner.
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The reason for doing this was because JSL, and RTL are
redundent, as they both do the same thing as JSR, and
RTS.
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- 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.
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the processor status register, a union now.
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done with a union, in order to make it more readable.
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functions.
I did this to make it more readable, while still
making it fast, due to inlining it.
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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!
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emulator smaller, and faster.
I am also starting to make SuBEditor's source code
more readable.
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It now has a lexer/tokenizer, along with a parser.
I have also made the emulator even smaller.
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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.
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We're now Free Software!!!
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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>
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remainder during a DIV instruction.
I also added the TAB, and TBA instructions, for
transfering between the Accumulator, and the
B register.
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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.
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I also added the ASR instruction, for doing arithmetic
shifts, and have added a hello world program.
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AKA, referencing a label before it has been declared
yet.
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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.
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I have also added a program that computes the
Fibonacci sequence that I wrote in Sux assembly.
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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.
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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.
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I have now implemented BRK, and RTI.
Also, BieHDC, and I will both be working on rev2.
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I finally implemented the other addressing modes, and
added a Makefile.
Not sure when I will start work on rev2 of Sux, but it
will be sometime soon.
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Fixed stack based instructions.
Fixed the rotate instructions.
Added carry to the shift instructions.
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some unneeded instructions.
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Sux emulator.
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