New sw folders

2024-10-14 23:48:16 -07:00
parent bc9b04853c
commit 21efb8ace8
11 changed files with 198 additions and 3 deletions
--- a/sw/bootloader/bootloader.s
+++ b/sw/bootloader/bootloader.s
@@ -0,0 +1,25 @@
+.export _init, _nmi_int, _irq_int
+
+.segment  "VECTORS"
+
+.addr      _nmi_int    ; NMI vector
+.addr      _init       ; Reset vector
+.addr      _irq_int    ; IRQ/BRK vector
+
+SDRAM= $200
+
+.code
+
+_nmi_int:
+_irq_int:
+
+_init:
+        lda #$00
+@start:
+        sta SDRAM
+        cmp SDRAM
+        bne @end
+        ina
+        bra @start
+
+@end:   bra @end