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6502 engine fixes #87

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Merged
dstelzer merged 8 commits into from
Aug 23, 2026
+210 −12
Merged

6502 engine fixes #87

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0f3e5e4
aambox: RAMTOP variable for testing low memory
sehugg Aug 21, 2026
3e783c8
6502 engine fix: page-cache window overlapped the heap during init
sehugg Aug 10, 2026
8d35fe2
6502: keep the savefile image inside the reserved page-cache window
sehugg Aug 11, 2026
69fae51
engine: UNDO and SAVERESTORE defines to save interpreter space
sehugg Aug 11, 2026
a17d3e5
engine: puts_xy saves a few bytes
sehugg Aug 12, 2026
c099f06
engine: define SAVEMAXBYTES for maximum size of savegame file (4096 b…
sehugg Aug 12, 2026
ca1a569
6502: fix save/restore corrupting the page cache
sehugg Aug 17, 2026
3fd0f0d
updated readme
sehugg Aug 22, 2026
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5 changes: 5 additions & 0 deletions readme.txt
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Expand Up @@ -122,6 +122,11 @@ Project website:

Release notes:

1.0.3:

6502 engine: Fixed some memory corruption issues, especially
involving save/restore/undo operations.

1.0.2:

Cleaned up the specification and some dev tools.
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2 changes: 1 addition & 1 deletion src/6502/Makefile
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Expand Up @@ -9,7 +9,7 @@ clean:
aambox6502: aambox6502.c fake6502.c

aambox_frontend.bin: aambox_frontend.s engine.s
xa -o $@ $<
xa -l aambox.labels -o $@ $< -DRAMTOP=49152

c64_frontend.bin: c64_frontend.s engine.s font.bin
xa -l labels -o $@ $< -DVERSION=\"$(VERSION)\"
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6 changes: 6 additions & 0 deletions src/6502/aambox_frontend.s
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Expand Up @@ -10,6 +10,8 @@

TRACE_INST = 0
TRACE_STORE = 0
UNDO = 1
SAVERESTORE = 1

DEFWIDTH = 80
PREXTRA = 2
Expand Down Expand Up @@ -502,6 +504,10 @@ io_readpage
#include "engine.s"

SAFEPG = (* + $ff) >> 8
#ifdef RAMTOP
RAMEND = RAMTOP
#else
RAMEND = $10000
#endif

SAVEADDR = SAFEPG << 8
2 changes: 2 additions & 0 deletions src/6502/c64_frontend.s
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Expand Up @@ -20,6 +20,8 @@
TRACE_INST = 0
TRACE_STORE = 0
MEASURE_TIME = 0
UNDO = 1
SAVERESTORE = 1

DEFWIDTH = 40
PREXTRA = 8
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