Working on MAP test.

Added fragment.

src/main/fragment/mos6502-common/vwum1=vwuc1_minus_vbuxx.asm

@@ -0,0 +1,8 @@
+stx $ff
+lda #<{c1}
+sec
+sbc $ff
+sta {m1}
+lda #>{c1}
+sbc #00
+sta {m1}+1

src/test/kc/examples/mega65/memorymap-test.c

@@ -4,32 +4,96 @@
 #include <mega65.h>
 
 void main() {
+    /*
     // Remap block at $4000 to point to $10000
     // offset = $10000-$4000 = $c000
     asm {
         lda #$c0 // lower blocks offset page
-        ldx #$40 // lower blocks to map + lower blocks offset page
+        ldx #$40 // lower blocks to map + lower blocks offset 
         ldy #0
         ldz #0
         map
         eom
     }
-
     // Put data into $4000
     asm {
         lda #$55
         sta $4000
     }
-
-}
+     */
+
+
+    char * block1 = 0x4000;
+    char * block2 = 0x8000;
+    memoryBlockRemap((unsigned char)>block1, 0x100);
+    memoryBlockRemap((unsigned char)>block2, 0x120);
+
+    // TODO: The mapper can only map the lower 32K to one memory address and the upper 32K to another
+    // TODO: The mapper always remaps both - so it cannot be separated into two different calls (without some memory)!
+
+    block1[0] = 0x55;
+    block1[1] = 0xaa;
+    block2[0] = 0x55;
+    block2[1] = 0xaa;
+    //block2[1] = 0xaa;
+    //block2[2] = block1[1];
 
 
-// Remap one of the 8 8K memory blocks of the MEGA65 to point to somewhere else in the 256MB memory space.
-// After the remapping the CPU will be actualy be accessing the remapped memory whenever it uses instructions accessing the remapped block.
-// blockAddress: The address of the 8K memory block to remap. The block addresses are: $0000, $2000, $4000, ...
-// newAddress: The address in 256MB memory that the block should point to. The address must be 256b page aligned: $00000000, $00000100, $00000200, ...
-void memoryBlockRemap(unsigned int blockAddress, unsigned long newAddress) {
 
 
 }
 
+
+// Remap one of the eight 8K memory blocks in the 64K address space of the 6502 to point somewhere else in the first 1MB memory space of the MEGA65.
+// After the remapping the CPU will access the mapped memory whenever it uses instructions that access the mapped block.
+// blockPage: Page address of the 8K memory block to remap (ie. the block that is remapped is $100 * the passed page address.) 
+// Legal block page addresses are: $00: block $0000-$1fff, $20: block $2000-$3fff, ..., $e0: block $e000-$ffff 
+// memoryPage: Page address of the memory that the block should point to in the 1MB memory space of the MEGA65. 
+// Ie. the memory that will be pointed to is $100 * the passed page address. Only the lower 12bits of the passed value is used.
+void memoryBlockRemap(unsigned char blockPage, unsigned int memoryPage) {
+    // Which block is being remapped? (0-7)
+    char block = blockPage / $20;
+    // Find the page offset (the number of pages to offset the block)
+    unsigned int pageOffset = memoryPage-blockPage;
+    if(block&4) {
+        // High block (4-7)
+        char * yVal = 0xfe;
+        char * zVal = 0xff;
+        *yVal = <pageOffset;
+        *zVal = 1<<(block) | (>pageOffset & 0xf);
+        asm {
+            lda #0      // lower blocks offset page low
+            ldx #0      // lower blocks to map + lower blocks offset page high nibble
+            ldy yVal    // upper blocks offset page
+            ldz zVal    // upper blocks to map + upper blocks offset page high nibble
+            map
+            eom
+        }
+    } else {
+        // Low block (0-3)
+        char * aVal = 0xfe;
+        char * xVal = 0xff;
+        *aVal = <pageOffset;
+        *xVal = 1<<(4|block) | (>pageOffset & 0xf);
+        asm {
+            lda aVal    // lower blocks offset page low
+            ldx xVal    // lower blocks to map + lower blocks offset high nibble
+            ldy #0      // upper blocks offset page
+            ldz #0      // upper blocks to map + upper blocks offset page high nibble
+            map
+            eom
+        }
+
+    }
+
+}
+
+// Test corner case behaviors
+// - Mapping two blocks to the same memory : [$4000-$5fff] >> [$10000-$12000], [$6000-$7fff] >> [$10000-$12000]
+// - Mapping two blocks to overlapping memory : [$4000-$5fff] >> [$10000-$12000], [$6000-$7f00] >> [$11000-$12ff]
+// - Mapping a block to the 1MB border : [$4000-$5fff] >> [$ff000-$100fff] or [$ff000-$00fff] ?
+// - Mapping a block over zeropage : [$0000-$1fff] >> [$10000-$12000]. Does zp-addressing-mode access the mapped memory? 
+
+
+// Add memory block remapping to the full 256MB memory
+

src/test/kc/examples/mega65/raster65.c

@@ -1,8 +1,7 @@
-// Raster65 Demo Implementation in C 
-// Based on RASTER65 assembler demo made by DEFT in 2015
+// Raster65 Demo re-implementation in C by Jesper Gravgaard
+// Based on RASTER65 assembler demo made in 2015 and updated in 2020 by DEFT 
 // https://mega.scryptos.com/sharefolder/MEGA/MEGA65+filehost
 // https://www.forum64.de/index.php?thread/104591-xemu-vic-iv-implementation-update/&postID=1560511#post1560511
-
 #pragma target(mega65_c64)
 #pragma emulator("/Users/jespergravgaard/c64/mega65/xemu-hernandp/build/bin/xmega65.native -prg")
 #include <mega65.h>
@@ -203,7 +202,7 @@ interrupt(hardware_stack) void irq() {
             (SCREEN + SCROLL_ROW*40)[i] = (SCREEN + SCROLL_ROW*40 + 1)[i];
         // Show next char
         char nxt = *(scroll_ptr++);
-        if(nxt==0) {
+        if(nxt == 0) {
             scroll_ptr = SCROLL_TEXT;
             nxt = *scroll_ptr;
         }