From 3d01ea6af666199212833196c3ed775949e3fc2a Mon Sep 17 00:00:00 2001
From: David Stancu <dstancu@nyu.edu>
Date: Sun, 28 Jan 2018 17:29:30 -0500
Subject: [PATCH] more reference material and working text blit

---
 README.md  |  3 ++-
 src/main.S | 55 ++++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 43 insertions(+), 15 deletions(-)

diff --git a/README.md b/README.md
index 98e65ad..8708283 100644
--- a/README.md
+++ b/README.md
@@ -46,4 +46,5 @@ There are a lot of good materials out there: here is what I used to make this ga
 - [SNES CPU overview, same CPU, nice insights](https://github.com/michielvoo/SNES/wiki/CPU)
 - [SNES opcode list](http://wiki.metroidconstruction.com/doku.php?id=super:technical_information:asm_mnemonics)
 - [65816 primer](http://softpixel.com/~cwright/sianse/docs/65816NFO.HTM)
-- [Another 6502 reference, insightful](https://github.com/wiz-lang/wiz/wiki/Registers-and-Memory-(6502))
\ No newline at end of file
+- [Another 6502 reference, insightful](https://github.com/wiz-lang/wiz/wiki/Registers-and-Memory-(6502))
+- [65816 interrupts guide](http://6502.org/tutorials/65c816interrupts.html)
\ No newline at end of file
diff --git a/src/main.S b/src/main.S
index c3a82d3..0f9b40c 100644
--- a/src/main.S
+++ b/src/main.S
@@ -23,28 +23,25 @@
             stal  $00C051     ; select text mode only. "only"?
             ldal  $00C054     ; select text page 1 (there are 2)
             ldal  $00C056     ; select "low res" graphics
+            rep   #$30        ; go back to 16-bit mode
 
-; ok, we are done toggling switches, let's go make a string
-            rep   #$20
+            ldx   #hithere+2 ; strl, first two bytes are strlen, # denotes immediate addr val
+            ldy   #$0400     ; start of text buffer on 00
+            ldal  hithere
+            dec
 
-            ldx   #2
-:loopy      nop
-            lda   hithere,x
-            stal  $000400,x
-            cpx   hithere
-            inx
-            bcs   outbrk
-            jmp   :loopy
-
-outbrk      brk
+            mvn   $02,        $00
+            brk
 
 ; Important locations
 SPEAKER     equ   $E0C030
 PRODOS16    equ   $E100A8
 
             jsl   PRODOS16
-                              ; This exit code is "device busy", why is it the only one
-                              ; that works?!
+
+; This exit code is "device busy", why is it the only one
+; that works?!
+
             da    $29
             adrl  QP
             bcs   ERROR
@@ -377,6 +374,36 @@ hithere     strl  "this was excruciating"
 
 
 
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