getting closer, properly toggling switches now!

README.md

@@ -28,6 +28,8 @@ There are a lot of good materials out there: here is what I used to make this ga
 
 - [IIgs Hardware Architecture](http://www.goldstarsoftware.com/applesite/Documentation/AppleIIgsHardwareReferenceManual.PDF)
   - p. 74 has a memory map
+- [IIgs firmware reference](http://www.applelogic.org/files/GSFIRMWAREREF1.pdf)
+  - Importantly, overview on bank $00, D $0000
 - [Scanlon's IIgs Assembly Programming](ftp://ftp.apple.asimov.net/pub/apple_II/documentation/programming/65816_gs/Apple%20IIGS%20Assembly%20Language%20Programming.pdf)
   - Tremendously useful reference for QuickDraw and some tools
 - [Programming the 65816 and 65xx family](https://apple2.gs/downloads/Programmanual.pdf)
@@ -44,3 +46,4 @@ 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))

src/main.S

@@ -2,27 +2,91 @@
             typ   $B3
             dsk   main.l
 
+                              ; this doesn't actually modeset the cpu
             mx    %00
             phk
             plb
 
+; we're going to enter into emulation mode, so we can toggle softswitches
+; doing so clobbers our stack pointer and supposedly other things so let's 
+; save the state of as many things as we can. 
+
+ncpui       da
+nstack      da
+
+; cpu status register first
+            php
+            pla
+            sta   ncpui
+
+; the stack pointer too            
+            tsc
+            sta   nstack
+
+; enable emulation mode, tell merlin we did so
+            sec
+            xce
+            sep   #$30
             mx    %11
-            sta   $E0
+
+; the manuals all seem to use zero page addresses, so we'll oblige and slide
+; the DP offset all the way up and go to bank 00
+            lda   $0000
             pha
+            pld
+            lda   $00
             pha
             plb
-            pld
-            sta   $C000
-            sta   $C054
 
-            mx    %00
+; toggle the softswitches; they don't take any values. some are only triggered
+; by writes, $C054 can be triggered by a read
+            sta   $C000       ; disable 80 column store?
+            sta   $C00C       ; disable 80 column hardware?!
+*            sta   $C050       ; set standard apple ii gfx mode
+            sta   $C051       ; select text mode only. "only"?
+            lda   $C054       ; select text page 1 (there are 2)
+*            lda   $C056       ; select "low res" graphics
 
-; load a char and write it to the 40 char text buffer
+
-bois        lda   "B"
+            lda   $CF
-            sta   $E00400
+            sta   $0400
-            sta   $E00401
+            sta   $0480
-            sta   $E00402
+
-            jmp   bois
+
+*; let's write more interesting (broken)
+*mood        asc   "this is excruciating"
+*nult        db
+*            lda   $00
+*            sta   nult        ; i.e null terminator
+
+*loop        clc
+*            ldx   #0
+*            lda   mood,x
+*            cmp   $00
+
+*            sta   $040,x
+
+*            inx
+*            bcc   loop
+
+*            brk
+
+*EPOC2
+
+*            clc
+*            xce
+*            rep   #$30
+*; disable emulation mode
+
+*            mx    %00
+*            brk
+
+*; load a char and write it to the 40 char text buffer
+*bois        lda   "B"
+*            sta   $E00400
+*            sta   $E00401
+*            sta   $E00402
+*            jmp   bois
 
 ; Important locations
 SPEAKER     equ   $E0C030
@@ -122,6 +186,65 @@ QP          adrl  $0000
 
 
 
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