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gbdemo resolves a bare --bios to bios/sl0pboy_bios.bin when present
(else stock gbc_bios.bin). Generate the fork with the emulator's
tools/mk_sl0pboy_bios.py. The gif now opens on the SL0PBOY boot
animation - logo drop, colorize, chime - before gbos comes up.
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sys_write sets wBatch; render_cursor_tile - the single choke point all
of term_putc's visible mutations pass through - then marks a dirty
span (per LINE-SLOT, so spans survive scroll rotation for free)
instead of rendering. term_write_end renders every dirty tile exactly
once, then the cursor. Scrolls stay immediate (blank rebuild is cheap
and artifact-free); file-bound writes flush for free.
The enabler is in libc: puts() was a SYS_PUTC trap PER CHARACTER, so
almost no console output ever went through sys_write. It now issues
one SYS_WRITE for the whole string - one trap, one batch, and every
line-printer (echo, irc, the shell) gets the batched path.
Measured: 37-char write = 128k cycles (3.5k/char) vs ~8k/char down
the per-char trap path. Full demo passes; GIF regenerated.
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spawn --bios shows the real power-on show (logo drop + splash) before
gbos boots; gbdemo resolves a bare --bios to the emulator's bundled
boot ROM by absolute path (the tmux pane cwd is wherever the user is).
The screen-synced waitfor absorbs the extra ~4s - only the first
prompt timeout got a bump. Regenerated with the double-speed kernel:
same demo, boots and scrolls visibly snappier.
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The BG map's 32 rows become a ring: logical row L always lives at map
row (wMapTop + L) & 31, and SCY = (wMapTop + wViewTop)*8 places the
view. Scrolling bumps wMapTop, rebuilds the one new bottom line and
writes its single map row (map_row_one); the other 17 rows move for
free. The whole OSK view dance - shift the cursor above the keys,
restore the backlog on hide - is now term_view_update: one SCY write,
no map rewrite at all.
OSK safety: the keyboard lives on the WINDOW layer, which SCY never
moves. Stale ring rows can only appear under it: wViewTop = max(0,
wCurRow-14) <= 3 is nonzero only while the OSK is visible, and the
window covers exactly those bottom 3 rows (WX=7, WY=120). Verified:
scroll + view shift + scroll-while-OSK-up + backlog restore all
pixel-correct via VRAM screenshots; full README demo passes.
term_scroll: 78.5k -> 35.6k T-cycles (857k pre-optimization: 24x).
OSK toggle: 45k tilemap rewrite -> 212 cycles.
Regenerated demo/gbos-demo.gif on the new renderer.
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Runs a step file: spawns a GB on the gbhub network, records the LCD to
a .gbv over the emulator control socket, injects console text (hub ctl,
like gbtype) and button events (gbctl) at the right moments, then
renders a GIF (gbgif.py).
Sync is waitfor/waitgone on the terminal's WRAM shadow (TERM_BUF $D600
+ wAssign row map) read via the emulator's debug socket - steps key off
real screen output, so boot/DHCP/IRC timing can vary without breaking
the choreography. demo/readme.gbd is the README GIF: cold boot -> uname
-> ping -> IRC session on 10.0.0.1.
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