gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem) https://git.sl0p.foo/gbos.git/atom/src/hram.asm?h=master 2026-07-18T19:56:21Z 2026-07-18T19:56:21Z user user@clank 2026-07-18T19:56:21Z urn:sha1:bea52bc8f99ee6dbcc8154a366560fc18e7b24c8 The ring-scroll wrote SCY mid-frame; SCY is sampled per scanline (on hardware and in sl0pboy's PPU), so a scroll landing mid-frame rendered the top of the frame at the old offset and the bottom at the new one - a one-frame shear, invisible in frame-sampled GIF captures but ugly on a live sixel view. term_view_update now writes hSCY (HRAM) and a transparent VBlank ISR (push af / apply / pop af / reti, same profile as TimerISR) copies it to rSCY, so the view only ever moves at frame boundaries. The scroll's tile+map writes stay immediate: the new map row is invisible at the old SCY by construction (it's the ring row one past the visible 18). 2026-07-18T08:10:17Z user user@clank 2026-07-18T08:10:04Z urn:sha1:0cc9b0a8bdf774ee376937d5a6767ccdced51245 The kernel had no clock: TimerISR was a reti stub, IEF_TIMER masked, and IME was never enabled - the vectors were decorative. sys_sleep just polls DIV deltas per-process; nothing counted globally. Now: TAC runs the hardware timer at 16384 Hz with TMA=0, so TIMA overflows at exactly 64 Hz; TimerISR increments a monotonic 32-bit wTicks (wraps after ~2.1 years). Scheduling stays cooperative - the ISR is transparent. Enabling IME in a kernel written for zero interrupts needs care wherever SP points into memory whose bank is being switched (an IRQ pushes onto SP): - read_block/write_block map the disk bank over the $A000 window that holds the caller's stack -> di/ei around the transfer (~2ms, well under the 15.6ms tick period, so no tick is ever lost) - hSwitchTo switches SVBK + cart-RAM banks under the outgoing stack -> di on entry, ei once the incoming stack is mapped - fork already runs on KSTACK_TOP2 (fixed WRAM) - safe as-is - term_putc's SVBK switch only remaps $Dxxx, stacks live in $Axxx/$Cxxx SYS_UPTIME (36) copies the counter (4B LE, di/ei so the read can't tear) to a user buffer; libc gticks(); usr/uptime.c formats 'up [Nd] H:MM:SS'. uptime avoids SDCC long div/shift entirely: sm83.lib modules link into their own areas that land in the $A000 RAM window (latent build.sh trap, documented there) - bytewise >>6 plus bounded subtraction loops instead. 2026-07-15T21:44:28Z user user@clank 2026-07-15T21:44:28Z urn:sha1:de725da74db5cba0f9bfd0755269e1683423d87b - fix ClearKernelRAM clobbering the kernel stack (only clear $C000-$CBFF) - fix SyscallTrap clobbering DE (buffer arg) during table dispatch - README: run via ~/dev/gbc --headless; note bring-up bugs