Give the system another page of each memory

CosmOS had 1,161 bytes of Program Memory left before the address applications
load at, and Tab completion is not going to fit in that with anything to spare.
So the wall moves up one page: the system keeps below 0x4FFF and 0x2FFF, and an
application is based at 0x5000 and 0x3000.

A PAGE IS A CHEAP THING TO GIVE IT AND AN EXPENSIVE THING TO RUN OUT OF. An
application still has 44K of Program Memory before the vector table and the
largest one here uses 7.5K, so what was taken from applications is space nothing
has ever asked for - while what the system gained is the difference between
building the next thing and counting bytes while building it.

Not doubling, which was the version that would have cost application space worth
minding. One page, and the same again when it is needed.

Nothing in the machine knows where the wall is, so this is 34 #Base lines, one
threshold in the fault handler, and the table in the CosmOS README that
Tests/docs.sh reads its limits out of.

The native assembler's scratch map had to move with it, and docs.sh said so
before anything ran: its data reached 0x40D6 and its buffers began at 0x4000, so
they were sitting on its variables. That file already carries a paragraph about
the floor coming up and the map staying where it was. It has happened twice now,
and been caught by a check the first time wrote.

Twenty three recordings are the same runs a page higher.

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

This commit is contained in:

Anachronaut

2026-09-01 16:49:12 -04:00

co-authored by

Claude Opus 5

parent f97d15de08

commit 3449405b18

59 changed files with 148 additions and 140 deletions

Tests/expected/cosmosBreak.out

+5 -5

View File

@@ -1,15 +1,15 @@
 CosmOS
 > load Break.sbx
 loaded, starting at 4000
 loaded, starting at 5000
 > run
 two stops, and what the registers were at each
 break at 4016
 break at 5016
 A 11 B 22 Q 00 status 00
 DP0 2030 DP1 2000 DP2 2037 DP3 4000 SP FFFF
 DP0 3030 DP1 3000 DP2 3037 DP3 5000 SP FFFF
 press a key
 break at 4034
 break at 5034
 A 44 B 55 Q 00 status 00
 DP0 2000 DP1 2037 DP2 2030 DP3 4000 SP FFF5
 DP0 3000 DP1 3037 DP2 3030 DP3 5000 SP FFF5
 press a key
 carried on to the end
 finished