Move greenspace to legacy dir

The test_gfx rom is doing some kind of blinking light thing, move it to
a subdir.

README.md

@@ -1,3 +1,10 @@
-Playing around with SNES assembly stuff
+# SNES Assembly
 
-https://wiki.superfamicom.org/ <- a resource
+This repo is a playground for messing around with SNES assembly.
+
+It uses the [wla-dx](https://github.com/vhelin/wla-dx) assembler toolchain.
+
+
+# Resources
+
+* https://wiki.superfamicom.org/

justfile

@@ -0,0 +1,8 @@
+default:
+    just --list
+
+greenspace_smc:
+    just legacy/greenspace/greenspace_smc
+
+test_gfx:
+    just legacy/test_gfx/test_gfx

legacy/greenspace/justfile

@@ -0,0 +1,4 @@
+greenspace_smc:
+    wla-65816 -o greenspace.obj greenspace.asm
+    wlalink greenspace.link greenspace.smc
+

legacy/test_gfx/header.inc

@@ -0,0 +1,55 @@
+;==LoRom==      ; We'll get to HiRom some other time.
+
+.MEMORYMAP                      ; Begin describing the system architecture.
+  SLOTSIZE $8000                ; The slot is $8000 bytes in size. More details on slots later.
+  DEFAULTSLOT 0
+  SLOT 0 $8000                  ; Defines Slot 0's starting address.
+.ENDME          ; End MemoryMap definition
+
+.ROMBANKSIZE $8000              ; Every ROM bank is 32 KBytes in size
+.ROMBANKS 8                     ; 2 Mbits - Tell WLA we want to use 8 ROM Banks
+
+.SNESHEADER
+  ID "SNES"                     ; 1-4 letter string, just leave it as "SNES"
+  
+  NAME "SNES Tile Demo       "  ; Program Title - can't be over 21 bytes,
+  ;    "123456789012345678901"  ; use spaces for unused bytes of the name.
+
+  SLOWROM
+  LOROM
+
+  CARTRIDGETYPE $00             ; $00 = ROM only, see WLA documentation for others
+  ROMSIZE $08                   ; $08 = 2 Mbits,  see WLA doc for more..
+  SRAMSIZE $00                  ; No SRAM         see WLA doc for more..
+  COUNTRY $01                   ; $01 = U.S.  $00 = Japan, that's all I know
+  LICENSEECODE $00              ; Just use $00
+  VERSION $00                   ; $00 = 1.00, $01 = 1.01, etc.
+.ENDSNES
+
+.SNESNATIVEVECTOR               ; Define Native Mode interrupt vector table
+  COP EmptyHandler
+  BRK EmptyHandler
+  ABORT EmptyHandler
+  NMI VBlank
+  IRQ EmptyHandler
+.ENDNATIVEVECTOR
+
+.SNESEMUVECTOR                  ; Define Emulation Mode interrupt vector table
+  COP EmptyHandler
+  ABORT EmptyHandler
+  NMI EmptyHandler
+  RESET Start                   ; where execution starts
+  IRQBRK EmptyHandler
+.ENDEMUVECTOR
+
+.BANK 0 SLOT 0                  ; Defines the ROM bank and the slot it is inserted in memory.
+.ORG 0                          ; .ORG 0 is really $8000, because the slot starts at $8000
+.SECTION "EmptyVectors" SEMIFREE
+
+EmptyHandler:
+       rti
+
+.ENDS
+
+.EMPTYFILL $00                  ; fill unused areas with $00, opcode for BRK.  
+                                ; BRK will crash the snes if executed.

legacy/test_gfx/justfile

@@ -0,0 +1,5 @@
+
+test_gfx:
+    wla-65816 -o test_gfx.obj test_gfx.asm
+    wlalink -r test_gfx.link test_gfx.smc
+

legacy/test_gfx/snes_init.asm

@@ -0,0 +1,102 @@
+ .MACRO Snes_Init
+        sei             ; Disabled interrupts
+        clc             ; clear carry to switch to native mode
+        xce             ; Xchange carry & emulation bit. native mode
+        rep     #$18    ; Binary mode (decimal mode off), X/Y 16 bit
+         ldx    #$1FFF  ; set stack to $1FFF
+         txs
+ 
+         jsr Init
+ .ENDM
+ 
+ .bank 0
+ .section "Snes_Init" SEMIFREE
+ Init:
+        sep     #$30    ; X,Y,A are 8 bit numbers
+        lda     #$8F    ; screen off, full brightness
+        sta     $2100   ; brightness + screen enable register 
+        stz     $2101   ; Sprite register (size + address in VRAM) 
+        stz     $2102   ; Sprite registers (address of sprite memory [OAM])
+        stz     $2103   ;    ""                       ""
+        stz     $2105   ; Mode 0, = Graphic mode register
+        stz     $2106   ; noplanes, no mosaic, = Mosaic register
+        stz     $2107   ; Plane 0 map VRAM location
+        stz     $2108   ; Plane 1 map VRAM location
+        stz     $2109   ; Plane 2 map VRAM location
+        stz     $210A   ; Plane 3 map VRAM location
+        stz     $210B   ; Plane 0+1 Tile data location
+        stz     $210C   ; Plane 2+3 Tile data location
+        stz     $210D   ; Plane 0 scroll x (first 8 bits)
+        stz     $210D   ; Plane 0 scroll x (last 3 bits) #$0 - #$07ff
+        lda     #$FF    ; The top pixel drawn on the screen isn't the top one in the tilemap, it's the one above that.
+        sta     $210E   ; Plane 0 scroll y (first 8 bits)
+        sta     $2110   ; Plane 1 scroll y (first 8 bits)
+        sta     $2112   ; Plane 2 scroll y (first 8 bits)
+        sta     $2114   ; Plane 3 scroll y (first 8 bits)
+        lda     #$07    ; Since this could get quite annoying, it's better to edit the scrolling registers to fix this.
+        sta     $210E   ; Plane 0 scroll y (last 3 bits) #$0 - #$07ff
+        sta     $2110   ; Plane 1 scroll y (last 3 bits) #$0 - #$07ff
+        sta     $2112   ; Plane 2 scroll y (last 3 bits) #$0 - #$07ff
+        sta     $2114   ; Plane 3 scroll y (last 3 bits) #$0 - #$07ff
+        stz     $210F   ; Plane 1 scroll x (first 8 bits)
+        stz     $210F   ; Plane 1 scroll x (last 3 bits) #$0 - #$07ff
+        stz     $2111   ; Plane 2 scroll x (first 8 bits)
+        stz     $2111   ; Plane 2 scroll x (last 3 bits) #$0 - #$07ff
+        stz     $2113   ; Plane 3 scroll x (first 8 bits)
+        stz     $2113   ; Plane 3 scroll x (last 3 bits) #$0 - #$07ff
+        lda     #$80    ; increase VRAM address after writing to $2119
+        sta     $2115   ; VRAM address increment register
+        stz     $2116   ; VRAM address low
+        stz     $2117   ; VRAM address high
+        stz     $211A   ; Initial Mode 7 setting register
+        stz     $211B   ; Mode 7 matrix parameter A register (low)
+        lda     #$01
+        sta     $211B   ; Mode 7 matrix parameter A register (high)
+        stz     $211C   ; Mode 7 matrix parameter B register (low)
+        stz     $211C   ; Mode 7 matrix parameter B register (high)
+        stz     $211D   ; Mode 7 matrix parameter C register (low)
+        stz     $211D   ; Mode 7 matrix parameter C register (high)
+        stz     $211E   ; Mode 7 matrix parameter D register (low)
+        sta     $211E   ; Mode 7 matrix parameter D register (high)
+        stz     $211F   ; Mode 7 center position X register (low)
+        stz     $211F   ; Mode 7 center position X register (high)
+        stz     $2120   ; Mode 7 center position Y register (low)
+        stz     $2120   ; Mode 7 center position Y register (high)
+        stz     $2121   ; Color number register ($0-ff)
+        stz     $2123   ; BG1 & BG2 Window mask setting register
+        stz     $2124   ; BG3 & BG4 Window mask setting register
+        stz     $2125   ; OBJ & Color Window mask setting register
+        stz     $2126   ; Window 1 left position register
+        stz     $2127   ; Window 2 left position register
+        stz     $2128   ; Window 3 left position register
+        stz     $2129   ; Window 4 left position register
+        stz     $212A   ; BG1, BG2, BG3, BG4 Window Logic register
+        stz     $212B   ; OBJ, Color Window Logic Register (or,and,xor,xnor)
+        sta     $212C   ; Main Screen designation (planes, sprites enable)
+        stz     $212D   ; Sub Screen designation
+        stz     $212E   ; Window mask for Main Screen
+        stz     $212F   ; Window mask for Sub Screen
+        lda     #$30
+        sta     $2130   ; Color addition & screen addition init setting
+        stz     $2131   ; Add/Sub sub designation for screen, sprite, color
+        lda     #$E0
+        sta     $2132   ; color data for addition/subtraction
+        stz     $2133   ; Screen setting (interlace x,y/enable SFX data)
+        stz     $4200   ; Enable V-blank, interrupt, Joypad register
+        lda     #$FF
+        sta     $4201   ; Programmable I/O port
+        stz     $4202   ; Multiplicand A
+        stz     $4203   ; Multiplier B
+        stz     $4204   ; Multiplier C
+        stz     $4205   ; Multiplicand C
+        stz     $4206   ; Divisor B
+        stz     $4207   ; Horizontal Count Timer
+        stz     $4208   ; Horizontal Count Timer MSB (most significant bit)
+        stz     $4209   ; Vertical Count Timer
+        stz     $420A   ; Vertical Count Timer MSB
+        stz     $420B   ; General DMA enable (bits 0-7)
+        stz     $420C   ; Horizontal DMA (HDMA) enable (bits 0-7)
+        stz     $420D   ; Access cycle designation (slow/fast rom)
+        cli             ; Enable interrupts
+        rts
+ .ends