Lander starts a flight where a flight starts

run does not reload, and that is right: run's job is to run the program
that is loaded, which is why it is a separate word from load and why
typing a program's name does both. What follows is that the numbers the
assembler wrote into a Data Segment are LOAD-time values, true once, and
a program that wants them true at every start has to say so itself.

Lander did not. Flying is 0x01 in the data and is only ever cleared, so a
second run began with the loop already over: the program started and
handed the machine straight back. Reproduced by running it, quitting, and
running again - the leftover game keys land at the shell prompt, which is
what a program that never read them looks like.

AND THE TEST FOUND A SECOND ONE, quieter and worse. The terrain seed is a
written number, so a fresh load always walks out the same moon - but
nextRandom moves it, and a second run generated a DIFFERENT moon. Nobody
decided that. A test comparing the whole screen found it without anybody
having had to think of it in advance, which is the argument for comparing
the picture rather than the variables somebody remembered to check.

Only what a flight needs to begin is put back. Anything not on the list
keeps what the last run left it, which is deliberate - state surviving a
run is sometimes exactly what is wanted, and the way to have that is for
the list to be a decision rather than a sweep. The things that are simply
nought are a table of NAMES that the assembler turns into addresses, so
adding a variable that must start empty means adding it there and nowhere
else.

video.sh now runs Lander, quits, runs it again, and requires the same
picture a hundred frames in - the same moon, the same lander in the same
place, the same gauges. break.sh confirms it by taking the seed line back
out: 37,995 bytes of the picture differ.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW

This commit is contained in:

Anachronaut

2026-09-06 09:02:50 -04:00

co-authored by

Claude Opus 5

parent b160c66110

commit 87467a7d3a

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Programs/CosmOS/README.md

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