mirror of
https://github.com/Russell-S-Harper/COMMON.git
synced 2024-11-24 08:30:57 +00:00
52 lines
2.1 KiB
Markdown
52 lines
2.1 KiB
Markdown
# COMMON
|
||
|
||
Advances some ideas using Steve Wozniak’s 6502 SWEET16 interpreted byte-code language as inspiration. While the goal of SWEET16 was brevity, the goal of COMMON is functionality. The intent is to make a platform suitable for many commercial, scientific, and engineering applications.
|
||
|
||
For example:
|
||
|
||
* native type is equivalent to fixed-point decimal ±######.###
|
||
* easier support for banked memory
|
||
* easier support for higher language compilers
|
||
* arithmetic operations add, subtract, multiply, divide, and modulus
|
||
* inherent overflow/underflow detection
|
||
* all control branching is 16-bit relative, for easier relocatable code
|
||
* support for custom system/user functions, akin to INT in x86
|
||
|
||
Why 6502 and not, for example, x86?
|
||
|
||
* 6502 assembler is very easy and has a large archive of existing functions
|
||
* existing 6502 SWEET16 already has the “hard work” done
|
||
* interesting to see it run in newer faster versions of 6502 processors
|
||
* how do you think Bender does what he does? (or the Terminator!)
|
||
|
||
Completed:
|
||
|
||
* added all the instructions (see `common/common.h` for the list)
|
||
|
||
In progress:
|
||
|
||
* context switching for simple multitasking
|
||
* a unit test suite to ensure each instruction is correct
|
||
* a proof-of-concept application
|
||
|
||
The meat of the project:
|
||
|
||
* `common/common.h`: details of instructions
|
||
* `common/common.asm`: assembler code for the instructions
|
||
* `common/macros.h`: macros used to define the interpreted byte-code
|
||
* `common/page6.src`: sample source file using the macros
|
||
|
||
Auxiliary:
|
||
|
||
* `emulator/*`: 6502 emulator (borrowed Mike Chambers’ Fake6502 CPU emulator v1.1 ©2011)
|
||
* `xa-pre-process/*`: my utility `xapp` to convert 32-bit fixed decimal quantities so that `xa` can use them
|
||
|
||
Right now, for testing purposes, the code builds everything into one file `system.obj` and runs the code in the last block loaded, in this case, the code corresponding to `page6.src`. Eventually will support decoupling of system and application files. Application files will be inherently relocatable.
|
||
|
||
To build and run:
|
||
|
||
make all
|
||
make run
|
||
|
||
The makefiles use `re2c`, `flex`, `bison`, `gcc`, `cpp`, `xa`, `grep`, and `sed`. Will eventually provide a `./configure`.
|