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‎.github/workflows/build.yml

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name: CI
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on:
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push:
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branches: [main]
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pull_request:
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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- name: Install Nix
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uses: cachix/install-nix-action@v31
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with:
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nix_path: nixpkgs=channel:nixos-unstable
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- name: Build inside nix-shell
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run: nix-shell --run './build.sh'

‎.gitignore

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build/

‎.vscode/settings.json

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{
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"cmake.generator": "Ninja",
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"cmake.showSystemKits": false,
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"cmake.useCMakePresets": "never",
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"cmake.buildDirectory": "${workspaceFolder}/build",
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"cmake.configureArgs": [
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"-DCMAKE_TOOLCHAIN_FILE=cc65-toolchain.cmake"
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],
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}

‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.10)
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project(xex_boot ASM)
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set(app_name ${CMAKE_PROJECT_NAME})
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add_executable(${app_name} boot.s)
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set_target_properties(${app_name} PROPERTIES SUFFIX ".sys")
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target_link_options(${app_name} PRIVATE -C atari-cassette.cfg)
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target_link_options(${app_name} PRIVATE --start-addr 0x0700)
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target_link_options(${app_name} PRIVATE -m ${app_name}.map)
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set_property(TARGET ${app_name} APPEND PROPERTY ADDITIONAL_CLEAN_FILES ${app_name}.map)
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# Post-build step: convert .sys file to .c array using xxd -i
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add_custom_command(
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TARGET ${app_name}
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POST_BUILD
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COMMAND ${CMAKE_COMMAND} -E echo "// Automatically generated file" > ${app_name}.c
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COMMAND ${CMAKE_COMMAND} -E echo "// clang-format off" >> ${app_name}.c
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COMMAND ${CMAKE_COMMAND} -E echo "" >> ${app_name}.c
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COMMAND xxd -i ${app_name}.sys >> ${app_name}.c
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COMMENT "Generating C array from ${app_name}.sys"
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)
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# Post-build step: copy generated .c file to the parent directory
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add_custom_command(
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TARGET ${app_name}
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POST_BUILD
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COMMAND ${CMAKE_COMMAND} -E copy ${app_name}.c ../../${app_name}.c
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COMMENT "Copying generated C array to parent directory"
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)

‎boot.s

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.include "atari.inc"
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.macpack generic
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.macpack longbranch
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CHUNK_SIZE = 1024
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HEADER_SIZE = 4
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; ========================================================================
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.zeropage
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blk_addr: .word 0
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blk_size: .word 0
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; ========================================================================
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.segment "CASHDR"
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.export _cas_hdr
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_cas_hdr: .byte 0
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.byte ((end - start) + 6 + 127) / 128
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.word _cas_hdr
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.word init
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; ========================================================================
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.code
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start:
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clc ; success
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rts
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error:
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lda #37
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sta 40000
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jmp error
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init:
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lda #$31 ; set device D1:
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sta DDEVIC
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lda #1
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sta DUNIT
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lda #5
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sta DTIMLO
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lda #$00 ; initialize block index
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sta DAUX1
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read_block:
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lda #$00 ; initialize chunk index
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sta DAUX2
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lda #$F0 ; set command <- 0xF0
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sta DCOMND
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lda #<blk_addr ; set block header address
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sta DBUFLO
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lda #>blk_addr
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sta DBUFHI
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lda #<HEADER_SIZE ; set buffer size
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sta DBYTLO
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lda #>HEADER_SIZE
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sta DBYTHI
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lda #$40 ; set direction to read
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sta DSTATS
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jsr SIOV ; receive a header
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jmi error
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lda #<start ; set INITAD to do nothing
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sta INITAD
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lda #>start
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sta INITAD + 1
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lda #<start ; set INITAD to do nothing
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sta RUNAD
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lda #>start
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sta RUNAD + 1
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read_chunk:
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lda #<CHUNK_SIZE ; calculate chunk size
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sta DBYTLO
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sub blk_size
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lda #>CHUNK_SIZE
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sta DBYTHI
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sbc blk_size + 1
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bcc copy_full ; full sized chunk?
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lda blk_size ; just few bytes left
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sta DBYTLO
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lda blk_size + 1
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sta DBYTHI
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copy_full:
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lda #$F1 ; set command <- 0xF1
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sta DCOMND
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lda blk_addr ; set buffer address
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sta DBUFLO
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lda blk_addr + 1
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sta DBUFHI
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lda #$40 ; set direction to read
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sta DSTATS
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jsr SIOV ; receive a chunk of data
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jmi error
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inc DAUX2 ; increment chunk index
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lda blk_addr ; advance block address
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add DBYTLO
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sta blk_addr
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lda blk_addr + 1
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adc DBYTHI
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sta blk_addr + 1
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lda blk_size ; adjust remaining block size
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sub DBYTLO
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sta blk_size
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lda blk_size + 1
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sbc DBYTHI
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sta blk_size + 1
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cmp #0
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jne read_chunk ; read next chunk if not done
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lda blk_size
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cmp #0
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jne read_chunk
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jsr init_block
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jsr run_block
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inc DAUX1 ; increment block index
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jmp read_block ; read next block
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init_block:
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jmp (INITAD)
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run_block:
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jmp (RUNAD)
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rts_addr:
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rts
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end:

‎build.sh

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cmake -G Ninja -DCMAKE_TOOLCHAIN_FILE=cc65-toolchain.cmake -B build
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cd build
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cmake --build .

‎cc65-toolchain.cmake

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# https://github.com/fo-fo/cc65-toolchain-example
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# CMake toolchain file for cc65
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# This is largely a result of experimentation, so some things may be done
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# suboptimally/wrong. Some compilation options/CMake features may not work.
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# Some generators will also not work (like MSVS). Ninja has been tested to work.
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# What is supported: C, assembly, static libraries
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set( CMAKE_SYSTEM_NAME Generic )
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macro( __compilerCc65 lang )
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set( CMAKE_${lang}_COMPILER cl65 CACHE PATH "${lang} compiler" )
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set( CMAKE_${lang}_COMPILER_ID cc65 )
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# We cannot run tests for the cc65 compiler, because of cross-compilation,
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# so force the compiler tests to passed.
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set( CMAKE_${lang}_COMPILER_ID_RUN TRUE )
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# Don't know if these are necessary.
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set( CMAKE_${lang}_COMPILER_ID_WORKS TRUE )
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set( CMAKE_${lang}_COMPILER_ID_FORCED TRUE )
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set( CMAKE_DEPFILE_FLAGS_${lang} "--create-dep <DEPFILE>")
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set( CMAKE_${lang}_VERBOSE_FLAG "-v" )
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set( CMAKE_${lang}_FLAGS_DEBUG_INIT "-g -D DEBUG --asm-define DEBUG" )
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endmacro()
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__compilerCc65( C )
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__compilerCc65( ASM )
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set( CMAKE_ASM_SOURCE_FILE_EXTENSIONS s;S;asm )
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# Not sure why CMake by default looks for the compilers, but not the archiver.
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# Force it to try to find the archiver.
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find_program( CMAKE_AR ar65 )
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# \note Need to delete the old file first because ar65 can only add files
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# into an archive (or remove named files, but we don't know the names).
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set( CMAKE_C_CREATE_STATIC_LIBRARY
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"<CMAKE_COMMAND> -E remove <TARGET> "
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"<CMAKE_AR> a <TARGET> <LINK_FLAGS> <OBJECTS>"
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)
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set( CMAKE_ASM_CREATE_STATIC_LIBRARY ${CMAKE_C_CREATE_STATIC_LIBRARY} )

‎shell.nix

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# shell.nix
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{ pkgs ? import <nixpkgs> {} }:
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pkgs.mkShell {
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buildInputs = with pkgs; [
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git
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cmake
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ninja
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cc65
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];
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}

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