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Give the system another page of each memory

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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
Download Patch File Download Diff File Expand all files Collapse all files
Programs/CosmOS/Apps/Break.asm
+2 -2
View File
@@ -39,7 +39,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Banner
@@ -72,7 +72,7 @@ deeper:
#Data
#Base 0x2000
#Base 0x3000
Banner:
"two stops, and what the registers were at each
Programs/CosmOS/Apps/Claim.asm
+2 -2
View File
@@ -19,7 +19,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
; One block, and ten bytes after it.
@@ -81,7 +81,7 @@ noWrite:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Name:
"claim.dat"
Programs/CosmOS/Apps/Compare.asm
+2 -2
View File
@@ -9,7 +9,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Arguments
@@ -236,7 +236,7 @@ secondReadFailed:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Arguments:
#Reserve 0d256
Programs/CosmOS/Apps/Copy.asm
+2 -2
View File
@@ -14,7 +14,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Arguments
@@ -232,7 +232,7 @@ doneFailed:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Arguments:
#Reserve 0d256
Programs/CosmOS/Apps/Crash.asm
+2 -2
View File
@@ -21,7 +21,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Argument
@@ -124,7 +124,7 @@ crashWait:
#Data
#Base 0x2000
#Base 0x3000
WordOpcode:
"opcode"
Programs/CosmOS/Apps/Edit.asm
+2 -2
View File
@@ -51,7 +51,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; ---- Room for a PATH, not a name ----
@@ -869,7 +869,7 @@ addByteToWord:
#Data
#Base 0x2000
#Base 0x3000
Break:
0x0A 0x00
Programs/CosmOS/Apps/Fib-16.asm
+2 -2
View File
@@ -4,7 +4,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; Swap ValueB and ValueA.
@@ -72,7 +72,7 @@ start:
#Data
#Base 0x2000
#Base 0x3000
ValueA:
; Low byte, high byte.
Programs/CosmOS/Apps/Fib-32.asm
+2 -2
View File
@@ -4,7 +4,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; Swap ValueB and ValueA.
@@ -128,7 +128,7 @@ start:
#Data
#Base 0x2000
#Base 0x3000
ValueA:
; Lowest byte ... Highest byte.
Programs/CosmOS/Apps/Fib-8.asm
+2 -2
View File
@@ -4,7 +4,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; Load our initial values into A and B.
@@ -38,6 +38,6 @@ start:
#Data
#Base 0x2000
#Base 0x3000
#Include print.asm
Programs/CosmOS/Apps/Files.asm
+2 -2
View File
@@ -24,7 +24,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; ---- Write it ----
@@ -133,7 +133,7 @@ noDelete:
#Data
#Base 0x2000
#Base 0x3000
Name:
"kept.txt"
Programs/CosmOS/Apps/Grid.asm
+2 -2
View File
@@ -23,7 +23,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; ---- Reaching video memory ----
@@ -411,7 +411,7 @@ everyCell:
#Data
#Base 0x2000
#Base 0x3000
ScreenKept:
0x00
Programs/CosmOS/Apps/Keys.asm
+2 -2
View File
@@ -17,7 +17,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
CIF ; Nothing arrives until there is something to catch it.
@@ -85,7 +85,7 @@ keyStop:
#Data
#Base 0x2000
#Base 0x3000
Banner:
"keys, by interrupt. q stops."
Programs/CosmOS/Apps/Life.asm
+2 -2
View File
@@ -32,7 +32,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
CALL seedGlider
@@ -350,7 +350,7 @@ delayDone:
#Data
#Base 0x2000
#Base 0x3000
RowCount:
0x00
Programs/CosmOS/Apps/Mode.asm
+1 -1
View File
@@ -23,7 +23,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
INA 0x31 ; Which mode the screen is in now.
Programs/CosmOS/Apps/More.asm
+2 -2
View File
@@ -8,7 +8,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Name
@@ -139,7 +139,7 @@ finished:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Usage:
"more: give me a file name
"
Programs/CosmOS/Apps/Once.asm
+2 -2
View File
@@ -25,7 +25,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Wanted
@@ -114,7 +114,7 @@ measureDone:
#Data
#Base 0x2000
#Base 0x3000
Prefix:
"system "
Programs/CosmOS/Apps/Pour.asm
+2 -2
View File
@@ -12,7 +12,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Argument
@@ -213,7 +213,7 @@ doneFailed:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Name:
"poured.dat"
Programs/CosmOS/Apps/Press.asm
+2 -2
View File
@@ -19,7 +19,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 LineText
@@ -141,7 +141,7 @@ keySay:
#Data
#Base 0x2000
#Base 0x3000
LineText:
"a line, then keys. q stops."
Programs/CosmOS/Apps/Reboot.asm
+2 -2
View File
@@ -27,7 +27,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Saying
@@ -45,7 +45,7 @@ start:
#Data
#Base 0x2000
#Base 0x3000
Saying:
"starting again
Programs/CosmOS/Apps/Say.asm
+2 -2
View File
@@ -16,7 +16,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Given
@@ -45,7 +45,7 @@ sayEnd:
#Data
#Base 0x2000
#Base 0x3000
SaidText:
"it says: "
Programs/CosmOS/Apps/Settle.asm
+2 -2
View File
@@ -23,7 +23,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SWI osBootState
@@ -71,7 +71,7 @@ alreadySettled:
#Data
#Base 0x2000
#Base 0x3000
WasTrying:
"the disk says a start is still in progress
Programs/CosmOS/Apps/Sieve-16.asm
+2 -2
View File
@@ -9,7 +9,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
RSTA
@@ -140,7 +140,7 @@ printCandidateHex:
#Data
#Base 0x2000
#Base 0x3000
; Segment has to begin on a page boundary, and now says so itself rather than relying on
; whatever happens to have been assembled before it. The marking loop adds the prime to
Programs/CosmOS/Apps/Sieve-8.asm
+2 -2
View File
@@ -4,7 +4,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; Search the list until we find a prime.
@@ -46,7 +46,7 @@ start:
#Data
#Base 0x2000
#Base 0x3000
; The table of our prime candidates. It has to begin on a page boundary: marking walks
; the pointer's low byte and treats the carry out as running off the end of the table,
Programs/CosmOS/Apps/Snake.asm
+2 -2
View File
@@ -38,7 +38,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; The two pointers whose low byte is a square number. Both regions are page aligned, so
@@ -615,7 +615,7 @@ pauseInner:
#Data
#Base 0x2000
#Base 0x3000
HeadCell:
0x00
Programs/CosmOS/Apps/Status.asm
+2 -2
View File
@@ -18,7 +18,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
SWI osLastStatus
@@ -70,7 +70,7 @@ done:
#Data
#Base 0x2000
#Base 0x3000
Prefix:
"the last program left "
Programs/CosmOS/Apps/Stream.asm
+2 -2
View File
@@ -36,7 +36,7 @@
#Program
#Base 0x4000
#Base 0x5000
start:
; ---- 1. How big is something that will not fit ----
@@ -408,7 +408,7 @@ printWhy:
#Data
#Base 0x2000
#Base 0x3000
BigName:
"big.txt"
Programs/CosmOS/Apps/Type.asm
+2 -2
View File
@@ -6,7 +6,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
SETD.0 Name
@@ -70,7 +70,7 @@ finished:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Usage:
"type: give me a file name
"
Programs/CosmOS/Apps/Wander.asm
+2 -2
View File
@@ -10,7 +10,7 @@
#Include services.asm
#Program
#Base 0x4000
#Base 0x5000
start:
; Where to go is the argument. Nothing else about this program says a directory name, so
@@ -85,7 +85,7 @@ noFile:
SWI osExit
#Data
#Base 0x2000
#Base 0x3000
Where:
#Reserve 0d64
Programs/CosmOS/Apps/greet.asm
+2 -2
View File
@@ -17,7 +17,7 @@
#Program
#Base 0x4000 ; Above the system, which keeps below here.
#Base 0x5000 ; Above the system, which keeps below here.
greet:
SETD.0 Opening
@@ -44,7 +44,7 @@ greet:
#Data
#Base 0x2000 ; And its data above the system's.
#Base 0x3000 ; And its data above the system's.
Opening:
"a program, loaded off a disk, running on the system that loaded it
Programs/CosmOS/Apps/hello.asm
+2 -2
View File
@@ -6,7 +6,7 @@
#Program
#Base 0x4000 ; Change two:
#Base 0x5000 ; Change two:
SETD hello ; Change three
Start:
@@ -26,6 +26,6 @@ End:
#Data
#Base 0x2000 ; Five, adjust the base of the data segment.
#Base 0x3000 ; Five, adjust the base of the data segment.
hello: ; Throw a label here so we can explicitly point at this data. Six, actually.
"Hello, World!"