From 935dbe6f3815e2daaba88c69cb087c8ec6ad1844 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 1 Oct 2014 15:00:00 -0400
Subject: initial framework for creating roms

---
 test.s | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 test.s

(limited to 'test.s')

diff --git a/test.s b/test.s
new file mode 100644
index 0000000..2cb9eb2
--- /dev/null
+++ b/test.s
@@ -0,0 +1,67 @@
+.MEMORYMAP
+SLOTSIZE     $2000
+DEFAULTSLOT  0
+SLOT 0       $C000
+SLOT 1       $E000
+.ENDME
+
+.ROMBANKMAP
+BANKSTOTAL  2
+BANKSIZE    $2000
+BANKS       2
+.ENDRO
+
+
+  .bank 0
+  .org $0000
+RESET:
+  SEI          ; disable IRQs
+  CLD          ; disable decimal mode
+  LDX #$40
+  STX $4017.W    ; disable APU frame IRQ
+  LDX #$FF
+  TXS          ; Set up stack
+  INX          ; now X = 0
+  STX $2000.W    ; disable NMI
+  STX $2001.W    ; disable rendering
+  STX $4010.W    ; disable DMC IRQs
+
+vblankwait1:       ; First wait for vblank to make sure PPU is ready
+  BIT $2002
+  BPL vblankwait1
+
+clrmem:
+  LDA #$00
+  STA $0000, x
+  STA $0100, x
+  STA $0200, x
+  STA $0400, x
+  STA $0500, x
+  STA $0600, x
+  STA $0700, x
+  LDA #$FE
+  STA $0300, x
+  INX
+  BNE clrmem
+
+vblankwait2:      ; Second wait for vblank, PPU is ready after this
+  BIT $2002
+  BPL vblankwait2
+
+  LDA #%10000000   ;intensify blues
+  STA $2001
+
+Forever:
+  JMP Forever     ;jump back to Forever, infinite loop
+
+NMI:
+  RTI
+
+
+  .bank 1 slot 1
+  .orga $FFFA    ;first of the three vectors starts here
+  .dw NMI        ;when an NMI happens (once per frame if enabled) the 
+                   ;processor will jump to the label NMI:
+  .dw RESET      ;when the processor first turns on or is reset, it will jump
+                   ;to the label RESET:
+  .dw 0          ;external interrupt IRQ is not used in this tutorial
-- 
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