shithub: sms

Download patch

ref: 5ea5c3cd1df2baf4463914f3873a322068d15429
parent: a154952ad1179d0bf348aed94c05f0504bb7820b
author: Jean-André Santoni <jean.andre.santoni@gmail.com>
date: Tue Jul 2 10:45:18 EDT 2024 

mem = rom + ram


--- a/dat.h
+++ b/dat.h
@@ -11,7 +11,7 @@
 extern uint16_t ram[32768];
 extern uint8_t *prg;
 extern uint8_t *rom;
-extern int nprg;
+extern uint8_t *mem;
 extern uint8_t *sram;
 extern uint32_t sramctl, sram0, sram1;
 
--- a/mem.c
+++ b/mem.c
@@ -28,10 +28,10 @@
 	printf("z80read %x\n", a);
 	uint16_t v;
 
-	if (a < 0x8000)
+	if (a < 0xC000)
 		return rom[a];
 	else
-		printf("z80read > 0x8000 %x\n", a);
+		return mem[a];
 }
 
 void
@@ -49,6 +49,30 @@
 		printf("z80write > 0xE000 %x %x\n", a, v);
         rom[a] = v;
         rom[a - 0x2000]  = v;
+
+        switch (a)
+        {
+            case 0xFFFC:
+            {
+                printf("Persistent RAM");
+                break;
+            }
+            case 0xFFFD:
+            {
+                printf("Switch mapper slot 0 to %d\n", v);
+                break;
+            }
+            case 0xFFFE:
+            {
+                printf("Switch mapper slot 1 to %d\n", v);
+                break;
+            }
+            case 0xFFFF:
+            {
+                printf("Switch mapper slot 2 to %d\n", v);
+                break;
+            }
+		}
 	}
 }
 
--- a/sms.c
+++ b/sms.c
@@ -15,23 +15,25 @@
 uint32_t r[16], pc, curpc;
 extern uint16_t spc, scurpc, sp;
 uint32_t asp, irq, stop;
-int nprg;
 uint8_t *sram;
 uint32_t sramctl, nsram, sram0, sram1;
 int doflush = 0;
-uint8_t header[0x7fff];
-uint8_t *prg = NULL;
+// uint8_t header[0x7fff];
+// uint8_t *prg = NULL;
 uint8_t *rom = NULL;
+uint8_t *mem = NULL;
 uint32_t pic[256*224] = {0};
 
 void
 loadrom(const uint8_t *data)
 {
-	memcpy(header, data, sizeof(header));
-	prg = malloc(49152);
-	memcpy(prg, data+sizeof(header), 49152);
-	rom = malloc(49152);
-	memcpy(rom, data, 49152);
+	// memcpy(header, data, sizeof(header));
+	// prg = malloc(0xC000);
+	// memcpy(prg, data+sizeof(header), 0xC000);
+	rom = malloc(0xC000);
+	memcpy(rom, data, 0xC000);
+	mem = malloc(0xC000+0x8000);
+	memcpy(mem, rom, 0xC000);
 	spc = 0;
 }
 
@@ -86,6 +88,8 @@
 {
 }
 
+int counter = 0;
+
 void
 retro_run(void)
 {
@@ -92,11 +96,12 @@
 	input_poll_cb();
 	process_inputs();
 
-	while(!doflush){
+	// while(!doflush){
+		printf("%d ================================\n", counter++);
 		z80step();
-	}
+	// }
 	video_cb(pic, 256, 224, 256*4);
-	//audioout();
+	// audioout();
 	doflush = 0;
 }
 
-- 
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