From a93dd00e3697f9af47bb09a118722678b597a4cf Mon Sep 17 00:00:00 2001 From: Brooke Vibber Date: Sun, 28 Dec 2025 12:55:08 -0800 Subject: [PATCH] Rearrange the segments a bit * put TABLES in the low memory, before the bank switch window * reserve bank switch window * put rest of the code after that and before the framebuffer so TABLES lives just before $4000 and MAIN lives in $8000-$bfff could split some more code and/or data into low mem and/or move the tables not used in extended memory mode into the bank switch window so they take no address space on XE or expanded memory machines --- atari-xex.cfg | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/atari-xex.cfg b/atari-xex.cfg index e9090b4..467d9d4 100644 --- a/atari-xex.cfg +++ b/atari-xex.cfg @@ -1,7 +1,7 @@ # Sample linker configuration for C programs using the Atari binary file support. # Use with: cl65 -tatari -Catari-xex.cfg prog.c -o prog.xex FEATURES { - STARTADDRESS: default = $2000; + STARTADDRESS: default = $8000; } SYMBOLS { __SYSTEM_CHECK__: type = import; # force inclusion of "system check" load chunk @@ -10,19 +10,24 @@ SYMBOLS { __RESERVED_MEMORY__: type = weak, value = $0000; __SYSCHKHDR__: type = export, value = 0; # Disable system check header __SYSCHKTRL__: type = export, value = 0; # Disable system check trailer + __TABLESEG_START__: type = weak, value = $2E00 + $0300; __TABLESEG_SIZE__: type = weak, value = 6 * $100; - __FRAMEBUFFER_START__: type = weak, value = $a000; + __BANKSY_START__: type = weak, value = $4000; + __BANKSY_SIZE__: type = weak, value = $4000; + __FRAMEBUFFER_START__: type = weak, value = $A000; } MEMORY { +# Note -- $80 and $81 (LOMEM) appear to be reserved in ZP. ZP: file = "", define = yes, start = $0082, size = $007E; # "system check" load chunk SYSCHKCHNK: file = %O, start = $2E00, size = $0300; -# Note we reserve $4000-7fff for the bank-switch window. # Note $a000-$bfff is against the BASIC cartridge, may require booting with OPTION. - TABLES: file = %O, define = yes, start = %S, size = __TABLESEG_SIZE__; + TABLES: file = %O, define = yes, start = __TABLESEG_START__, size = __TABLESEG_SIZE__; +# We reserve $4000-7fff for the bank-switch window. +# In theory we could keep data and code here that we only use on 48k/64k systems. + BANKSWITCH: file = "", define = yes, start = __BANKSY_START__, size = __BANKSY_SIZE__; # "main program" load chunk - MAIN: file = %O, define = yes, start = %S + __TABLESEG_SIZE__, size = __FRAMEBUFFER_START__ - __STACKSIZE__ - __RESERVED_MEMORY__ - __TABLESEG_SIZE__ - %S; - + MAIN: file = %O, define = yes, start = %S, size = __FRAMEBUFFER_START__ - __STACKSIZE__ - __RESERVED_MEMORY__ - %S; } FILES { %O: format = atari; @@ -36,6 +41,7 @@ SEGMENTS { EXTZP: load = ZP, type = zp, optional = yes; SYSCHK: load = SYSCHKCHNK, type = rw, define = yes, optional = yes; TABLES: load = TABLES, type = ro, optional = yes, align = 256; + BANKSWICH: load = BANKSWITCH, type = ro, optional = yes; STARTUP: load = MAIN, type = ro, define = yes; LOWBSS: load = MAIN, type = rw, optional = yes; # not zero initialized LOWCODE: load = MAIN, type = ro, define = yes, optional = yes;