SplitBit-Emulator/Tests/expected/cosmosFault.out at b83ba5bf7a1060491a17ce9572c5d5c7f87c16fa

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AnachronautandClaude Opus 5 b83ba5bf7a A colour reaches a terminal as well as the screen

The console's attribute has always meant something to the screen and
nothing to the serial line: its low nibble picks one of sixteen ink and
paper pairs, and only videoPutCell ever read it. So the fault screen's
red was red in the window and grey down the wire, and Examples/colours
printed " ordinary  highlighted " with nothing to tell them apart.

It is said in ANSI now, on the same terms the cursor is said in: a
register write only marks it and the next character sends it, so setting
a scheme and printing nothing says nothing, and setting the same scheme
twice costs one sequence rather than two. Only the scheme nibble crosses
- the page bits say which tiles a cell draws from, which is a fact about
the screen's own art.

THE ORDER WAS ALREADY RIGHT, which is worth saying because it looks like
a borrowing and is not. Both sets enumerate a three-bit colour, red green
blue counted in binary: one is red in both, three is yellow in both, six
is cyan in both. The same arithmetic done twice, forty years apart. The
one place they differ is slot 0, and that difference is forced - this
screen is ink on black, so ink cannot be black, and slot 0 is grey where
ANSI's is black.

Every sequence begins with a reset, so going from bank 8 to bank 1 does
not write red on the grey paper bank 8 left behind.

Scheme 0 is a bare reset rather than grey on black, and a terminal is
assumed to start plain - so a machine that never asks for a colour says
nothing at all, and one that does put the terminal back on its way out.
Two ways out, because the two endings have different rules: stopping on
purpose goes through stdio, since atexit runs BEFORE the buffer is
flushed and a reset written to the file descriptor would arrive in front
of the text it is meant to follow. Dying on a signal writes the four
bytes directly and accepts that the buffer may be lost.

colourTest walks all sixteen and then halts WITH ONE STILL SET, so the
recording shows the reset after the halt line rather than before it.

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

2026-09-06 17:24:44 -04:00

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CosmOS
> Crash opcode
that byte is not an instruction, at 5081
A 00 B 0F Q 00
the program was stopped
> Crash service
nothing is installed at service 28, at 5084
A 00 B 0F Q 00
the program was stopped
> Crash bank
a bank that is not there, or an address past its end, at 509E
A 01 B 0F Q 00
the program was stopped
> Crash device
nothing is installed for the device on port 00, at 50A5
A 02 B 0F Q 00
the program was stopped
> Crash sideways
Crash opcode | service | bank | device | blind
finished
> dir
greet.sbx 211
hello.sbx 53
Life.sbx 1396
Snake.sbx 2164
Keys.sbx 664
Say.sbx 156
Where.sbx 827
Break.sbx 149
Grid.sbx 571
Press.sbx 872
Mode.sbx 48
Flip.sbx 173
Sprite.sbx 442
Depth.sbx 672
Packages <dir>
Pad.sbx 264
Crash.sbx 632
vars.script 50
blocks.script 343
loops.script 272
tune.sbx 318
Play.sbx 2526
notes.txt 21
Apps <dir>
hi.script 121
bad.script 45
plain.script 24
cross.script 280
nonl.script 38
outer.script 376
inner.script 44
loop.script 35
hush.script 42
aloud.script 59
args.script 64
pass.script 20
holds.script 87
35 files, 2 directories
> exit
halted
Execution halted.
[exit 0]

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