ITS ALIVE (not rly no image yet)

1 files changed, 7 insertions, 6 deletions

diff --git a/README b/README
index 5db532a..605481d 100644
--- a/README
+++ b/README
@@ -8,16 +8,17 @@ emulator base
 - [x] cart package (iNES parser, mapper 0)
 
 system bus (nes package)
-- [/] Bus type: 2KB RAM mirrored through $1FFF, PPU regs $2000-$3FFF (mirrored every 8), APU/IO $4000-$4017, cart $4020+ (need to do PPU and APU first)
+- [/] Bus type: 2KB RAM mirrored through $1FFF, PPU regs $2000-$3FFF (mirrored every 8), APU/IO $4000-$4017, cart $4020+ (APU still missing)
 - [ ] OAM DMA at $4014 (stalls CPU 513/514 cycles)
 - [x] reuse it in nestest_test.go instead of the test-only bus
-- [ ] CPU stall hook and proper IRQ/NMI line (polled between instructions)
+- [ ] CPU stall hook and proper IRQ/NMI line (polled between instructions) - PPU currently fires NMI straight from Console.Step, see its doc comment
 
 ppu, background
-- [ ] registers $2000-$2007 and v/t/x/w latch logic
-- [ ] nametables with mirroring, pattern tables, palettes, buffered $2007 reads
-- [ ] 341 dots x 262 lines timing, 3 dots per CPU cycle
-- [ ] vblank flag and NMI
+- [x] registers $2000-$2007 and v/t/x/w latch logic
+- [x] nametables with mirroring, palettes, buffered $2007 reads (pattern tables go through the mapper already)
+- [x] 341 dots x 262 lines timing, 3 dots per CPU cycle, odd-frame skip dot
+- [x] vblank flag and edge-triggered NMI, including the $2002 set-dot race window (see ppu/registers.go's readStatus)
+- [ ] background shift-register pixel pipeline, PPUMASK clipping
 - [ ] 256x240 framebuffer and RGB palette
 
 frontend and input