name	run-ur
description	Build, launch, screenshot, and drive the Royal Game of Ur retro game (Atari 8-bit + Atari 5200). Use when asked to run, start, build, test, screenshot, or play-test Ur, or to verify an Atari/5200 graphics/sound/gameplay change in the emulator.

Run Ur (Atari 8-bit / Atari 5200)

Ur is a cross-compiled 6502 game — there is no native binary. You "run" it by building a ROM and loading it in the atari800 emulator, then driving it like a person (keys + screenshots). The harness that does this is driver.sh: it launches atari800, sends a key sequence, screenshots, and exits in one shot — the agent path. Paths below are relative to the repo root (this directory's <repo>/).

Prerequisites

This dev host is Garuda/Arch (pacman); all tools below were already installed. Build toolchain (cl65 = cc65, zcc = z88dk; the repo Dockerfile is the canonical build image — z88dk base + cc65 from source) and the drive tools (an X display is required — DISPLAY=:0):

# Arch (this machine) — package names verified via `pacman -Qo`:
sudo pacman -S --needed cc65 z88dk atari800 xdotool imagemagick perl
# Debian/Ubuntu equivalent:
#   sudo apt-get install -y cc65 z88dk atari800 xdotool imagemagick perl

cc65 = 6502 targets (Atari / 5200 / C64 / Apple II); z88dk = Z80 (Adam / SMS / GB).

Build

make atari      # -> build/atari/ur.xex   (Atari 8-bit, the primary target)
make a5200      # -> build/a5200/ur.a52   (Atari 5200 cartridge, 32K)
make test       # host unit tests for src/common  (-> "20102/20102 checks passed / OK")

Other targets build too (make adam c64 apple2 sms coleco) but are not driven by this skill — see Other targets below. make alone builds everything.

Run — agent path (driver.sh)

Build first, then drive. Each call launches → sends keys → writes a PNG → kills the emulator:

# Title screen (boot + screenshot, no input):
.claude/skills/run-ur/driver.sh atari /tmp/ur_title.png

# In-game board (keys: 2 = vs-computer, 1 = roll/ack), then screenshot:
.claude/skills/run-ur/driver.sh atari /tmp/ur_board.png 2 1

# Atari 5200 title (slower boot is handled):
.claude/skills/run-ur/driver.sh a5200 /tmp/ur5200_title.png

# With sound (capture the PipeWire monitor separately if you need audio):
SDL_AUDIODRIVER= .claude/skills/run-ur/driver.sh atari /tmp/ur_snd.png

driver.sh <atari|a5200> <out.png> [key ...] — keys are xdotool keysyms sent in order. Always open the PNG and look at it (blank teal = booted too early; see Troubleshooting).

Controls (what to send): menu 1–7 (A8) / 1,2,4 (5200); in-game press any key to roll, then 1–N to pick a move; F4 = OPTION (toggles the music). On the 5200 the controller keypad maps to the host number keys.

Run — human path

atari800 -windowed -nobasic -nojoystick build/atari/ur.xex          # A8, interactive
atari800 -5200 -5200-rev altirra -windowed -nojoystick -cart-type 4 -cart build/a5200/ur.a52

Inside a Claude Code session, launch the human path with the ! prefix (e.g. ! atari800 -windowed -nobasic -nojoystick build/atari/ur.xex) so the GUI runs in your terminal — a backgrounded atari800 spawned from the agent's shell gets killed (see Gotchas).

Other targets (build-verified; different emulators)

Coleco Adam make adam → build/adam/ur.ddp — run in mame adam.
ColecoVision make coleco → build/coleco/ur.rom — mame coleco -cart ….
C64 make c64 → build/c64/ur.prg — the dense "Standard of Ur" board (SMS- style); run in VICE: x64sc -warp -autostart build/c64/ur.prg. Drive with xdotool (xset r off first): menu keys 1/2, then keys to roll/pick. See src/c64/CLAUDE.md. (ONLINE=1 keeps the sprite board.)
Apple II make apple2 → build/apple2/ur.po — mame apple2ee (ProDOS disk).
SMS make sms → build/sms/ur.sms — the graphical showpiece; run in mame sms (D-pad = arrows, button 1 = Left Ctrl). Drive like the Atari path but xset r off first (X key-repeat → extra control-pad edges). See src/sms/CLAUDE.md.
Game Gear make gamegear → build/sms/ur-gg.gg — same art, compacted to the GG's 160×144 window (-DUR_GG); run in mame gamegear (same controls as SMS).
Game Boy / Color make gb → build/gb/ur.gb — ONE dual-mode cart: colour in mame gbcolor, 4 greys in mame gameboy (D-pad = arrows, A = Left Ctrl). The gameboy driver shows a "sound" warning — press a key to dismiss before driving. See src/gb/CLAUDE.md.

Gotchas (this environment — non-obvious)

sleep is killed (command exits 144) in this sandbox. The driver uses perl -e 'select(...)' for delays instead. Don't add sleep to driver flows.
Detached GUI procs get SIGSTKFLT (144). atari800 left running in the background dies, so the driver does launch→drive→capture→kill in one command. Don't try to keep an emulator alive across separate tool calls.
-nojoystick is essential. Otherwise atari800 grabs the host keyboard's media keys as "joystick 0" and the keyboard menu stops responding to xdotool.
Send keys with real XTEST: xdotool windowactivate --sync $W then keydown/keyup. xdotool --window … key (synthetic) is ignored by atari800's SDL input.
The 5200 boots slower (~4.5 s) than the A8 (~2.6 s); capturing too early gives a blank teal frame. The driver waits per-target.
5200 needs no external BIOS: -5200-rev altirra uses the built-in AltirraOS; -cart-type 4 = standard 32K 5200 cart.
Don't use atari800 -aname (audio recording) — it silences live audio. For sound, use -sound and record the PipeWire sink monitor with parecord.
Keep each driver call short (≈ under 6 s total). Long key sequences can be killed mid-run by the sandbox; split into multiple short calls if needed (note the emulator state resets between calls — it's relaunched each time).

Troubleshooting

Blank/teal screenshot → boot wait too short (esp. 5200) or window captured before it mapped. Raise BOOT in driver.sh for that target.
ERROR: no atari800 window → launch failed (the driver prints the atari800 log) or the window hadn't mapped — usually a missing build artifact (make atari first) or X not reachable (DISPLAY).
Keys do nothing → missing -nojoystick, or the window wasn't focused (windowactivate --sync). The driver handles both.
make a5200 "RODATA overflows ROM" → the 5200 needs a 32K cart (__CARTSIZE__=0x8000, already set in makefiles/a5200.mk).

name	run-ur
description	Build, launch, screenshot, and drive the Royal Game of Ur retro game (Atari 8-bit + Atari 5200). Use when asked to run, start, build, test, screenshot, or play-test Ur, or to verify an Atari/5200 graphics/sound/gameplay change in the emulator.