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- # Nova128 compiler memory map (E01-S05). docs/memory-map.md explains each
- # region and the evidence behind it. ld65 refuses any segment that overflows
- # its area, so this layout is also the compiler's capacity check.
- #
- # Bank 0 (CR=$0E) Bank 1 (CR=$4E)
- # $0000-$12FF system (BASIC/KERNAL) $0000-$1FFF hidden by common RAM
- # $1300-$18FF COMMON (copied at init) $2000-$6AFF SRCCACHE source cache
- # $1900-$19FF DISKBUF $6B00-$BFFF BANK1 compiler tables
- # $C000-$FFFF system ROM (unmapped RAM)
- # $1A00-$1AFF private zero page (P0)
- # $1B00-$1BEF SCRATCH (common)
- # $1BF0-$1BFF MAILBOX
- # $1C01-$B7FF MAIN (stub, code, data)
- # $B800-$BFFF SWSTACK
- # $C000-$FFFF system ROM
-
- MEMORY {
- # Logical zero page. With P0 -> $1A00 these are physical $1A02-$1AFF.
- # $00/$01 are the 8502 port and are never allocated.
- ZP: file = "", start = $0002, size = $00FE, type = rw, define = yes;
-
- LOADADDR: file = %O, start = $1BFF, size = $0002;
- HEADER: file = %O, start = $1C01, size = $000C;
- MAIN: file = %O, start = $1C0D, size = $9BF3, define = yes; # to $B7FF
-
- COMMONRAM: file = "", start = $1300, size = $0600, define = yes; # to $18FF
- DISKBUF: file = "", start = $1900, size = $0100, define = yes;
- SCRATCH: file = "", start = $1B00, size = $00F0, define = yes;
- MAILBOX: file = "", start = $1BF0, size = $0010, define = yes;
- SWSTACK: file = "", start = $B800, size = $0800, define = yes; # to $BFFF
-
- # Whole-file source cache (D118): >= 18,999 bytes, page aligned.
- SRCCACHE: file = "", start = $2000, size = $4B00, define = yes; # to $6AFF
- BANK1: file = "", start = $6B00, size = $5500, define = yes; # to $BFFF
- }
-
- SEGMENTS {
- ZEROPAGE: load = ZP, type = zp, optional = yes;
- LOADADDR: load = LOADADDR, type = ro;
- EXEHDR: load = HEADER, type = ro;
- STARTUP: load = MAIN, type = ro; # first: SYS 7181 enters at $1C0D
- # COMMON's load image comes next so mmu_init, which copies it in the
- # system mapping (BASIC ROM over $4000-$7FFF), reads it below $4000.
- COMMON: load = MAIN, run = COMMONRAM, type = rw, optional = yes, define = yes;
- CODE: load = MAIN, type = ro;
- RODATA: load = MAIN, type = ro, optional = yes;
- DATA: load = MAIN, type = rw, optional = yes;
- BSS: load = MAIN, type = bss, optional = yes, define = yes;
- DISKBUF: load = DISKBUF, type = bss, optional = yes;
- SCRATCH: load = SCRATCH, type = bss, optional = yes;
- MAILBOX: load = MAILBOX, type = bss, optional = yes;
- SWSTACK: load = SWSTACK, type = bss, optional = yes;
- SOURCE: load = SRCCACHE, type = bss, optional = yes, define = yes;
- TABLES: load = BANK1, type = bss, optional = yes, define = yes;
- }
-
- SYMBOLS {
- # Physical bank-0 page that P0 maps to logical zero page in compiler states.
- __COMPILER_ZP_PAGE__: type = export, value = $1A;
- }
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