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Create standard or custom PET/CBM Editor ROMs
This project forked from sjgray/cbm-edit-rom
Create standard or custom PET/CBM Editor ROMs
PET/CBM EDIT ROM PROJECT - Steve J. Gray - Started Nov 26, 2013 ======================== - Updated - Apr 26, 2022 This project will allow you to build various EDIT ROMS for the Commodore PET/CBM line of computers. FILES: make.bat - Type "make" to assemble with options set in "edit.asm" file edit.asm - The "main" source file. Contains directives to choose which options to include/use. editrom.asm - Logic to assemble code in LOWER 2K area and determine if HI area is required. edit_hi.asm - Logic to assemble code in UPPER 2K area, including IO area. editrom40.asm - CODEBASE 0 - 40 column, 2K ROM editrom80.asm - CODEBASE 1 - 80 column, 2K ROM editrom82.asm - CODEBASE 2 - LOWER area. 80 column, 4K ROM, DIN editor editrom82ext.asm- CODEBASE 2 - UPPER area. ext* - Code for CODEBASE 2's upper 2K of 4K (subsections) crt* - Files to define screen settings. Written to CRTC controller chip. kbd* - Files to define keyboard matrix for simple keyboard scanning routine. kbdx* - Keyboard matrices for extended keyboard scanning routine. screen* - Screen line pointer tables for 40/80 column screens mem* - Standard PET/CBM memory usage includes - zero page, low mem, and chips etc
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