initial commit

2026-07-18 20:34:55 +02:00
commit 59ad004c96
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+#ifndef MEMMAP_H
+#define MEMMAP_H
+
+#include "types.h"
+
+// MMAP_ROM        : BASIC + I/O  + KERNAL -> default power on config
+// MMAP_NO_BASIC   :         I/O  + KERNAL -> easy extra chunk of contiguous RAM
+// MMAP_NO_ROM     :         I/O           -> I/O and COLOR RAM in $d000-$dfff block, rest is RAM
+// MMAP_RAM        :                       -> ALL RAM, you'll need to manage some state switching...
+// MMAP_CHAR_ROM   :         CHAR          -> no BASIC or KERNAL or I/O, but can copy CHAR ROM
+// MMAP_ALL_ROM    : BASIC + CHAR + KERNAL -> All ROM functions available, but no I/O
+
+#define MMAP_ROM        0x37
+#define MMAP_NO_BASIC   0x36
+#define MMAP_NO_ROM     0x35
+#define MMAP_RAM        0x30
+#define MMAP_CHAR_ROM   0x31
+#define MMAP_ALL_ROM    0x33
+
+// Install an IRQ an NMI trampoline, that routes the kernal interrupts
+// through an intermediate trampoline when the kernal ROM is not paged
+// in.  The trampoline enables the ROM, executes the interrupt and
+// restores the memory map setting before returning.
+
+void mmap_trampoline(void);
+
+// Set the memory map in a way that is compatible with the IRQ
+// trampoline, returns the previous state
+
+inline char mmap_set(char pla);
+
+#pragma compile("memmap.c")
+
+#endif