Epic 01: Custom GEMDRIVE emulation#1
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diegoparrilla merged 1 commit intomainfrom Apr 30, 2026
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Port GEMDRIVE emulation from md-drives-emulator into md-devops, with two deliberate divergences: - Default SD subfolder is /devops (was /hd), user-configurable. - m68k GEMDRIVE code is fully relocatable to a runtime-chosen RAM address (default screen_base - 8 KB), and the relocated start is adopted as the new _memtop so TOS does not allocate over the resident code. _memtop is also independently overridable. Atari ST side (target/atarist/src): - New gemdrive.s blob placed at cartridge offset 0x0800 (6 KB), PC-relative throughout so it survives relocation. - main.s gains gemdrive_init: copies the blob to the configured RAM address at boot and patches _memtop. - Linker script renamed userfw.ld -> devops.ld; userfw.s removed. RP2040 side (rp/src): - New gemdrive.c / gemdrive.h implementing the GEMDOS hooks. - aconfig adds GEMDRIVE_FOLDER, GEMDRIVE_RELOC_ADDR, DEVOPS_MEMTOP. - Menu/setup terminal ported from md-drives-emulator: term command level dispatcher, dual-font OLED strip, ESC p/q reverse-video title, browsable SD-card folder selector (sdcard_loadDirectory + navigate_directory pager), [E]xit wired to DISPLAY_COMMAND_START. Build: BOOT.BIN at 7112 / 8192 bytes; rp UF2 builds clean.
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Port GEMDRIVE emulation from md-drives-emulator into md-devops, with two deliberate divergences:
Atari ST side (target/atarist/src):
RP2040 side (rp/src):
Build: BOOT.BIN at 7112 / 8192 bytes; rp UF2 builds clean.