Contents

; you.s
;
; TODO: summary

INCLUDE "lib/gbhw.inc" ; gameboy hardware definitions
INCLUDE "lib/ibmpx1.inc" ; ibm ascii font macros


; interrupts
SECTION "Vblank",HOME[$0040]
  reti
SECTION "LCDC",HOME[$0048]
  reti
SECTION "Timer_Overflow",HOME[$0050]
  reti
SECTION "Serial",HOME[$0058]
  reti
SECTION "p1thru4",HOME[$0060]
  reti

; jump to start of user code at `begin`

SECTION "start",HOME[$0100]
nop
jp begin

; rom header - no memory bank controller, 32k rom, 0; ram
  ROM_HEADER ROM_NOMBC, ROM_SIZE_32KBYTE, RAM_SIZE_0KBYTE


INCLUDE "lib/memory.inc"; memory copying macros

TileData:
  chr_IBMPC1 1,8 ; LOAD ENTIRE CHARACTER SET

; initialization
begin:
  nop
  di
  ld sp, $ffff  ; set the stack pointer to highest mem location + 1
init:
  ld a, %11100100  ; Window palette colors, from darkest to lightest
  ld [rBGP], a  ; CLEAR THE SCREEN

  ld a,0   ; SET SCREEN TO TO UPPER RIGHT HAND CORNER
  ld [rSCX], a
  ld [rSCY], a
  call StopLCD  ; YOU CAN NOT LOAD $8000 WITH LCD ON
  ld hl, TileData
  ld de, _VRAM  ; $8000
  ld bc, 8*256   ; the ASCII character set: 256 characters, each with 8 bytes of display data
  call mem_CopyMono ; load tile data
  ld a, LCDCF_ON|LCDCF_BG8000|LCDCF_BG9800|LCDCF_BGON|LCDCF_OBJ16|LCDCF_OBJOFF
  ld [rLCDC], a
  ld a, 32  ; ASCII FOR BLANK SPACE
  ld hl, _SCRN0
  ld bc, SCRN_VX_B * SCRN_VY_B
  call mem_SetVRAM

; main
  ld hl,Title
  ld de, _SCRN0+3+(SCRN_VY_B*7) ;
  ld bc, TitleEnd-Title
  call mem_CopyVRAM

wait:
  halt
  nop
  jr  wait

Title:
  DB  "you + rubygb!"
TitleEnd:

StopLCD:
  ld a,[rLCDC]
  rlca
  ret nc

.wait:
  ld a,[rLY]
  cp 145
  jr nz,.wait


  ld a,[rLCDC]
  res 7,a
  ld [rLCDC],a

  ret

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
rubygb-0.2.2	scrap/you/you.s
rubygb-0.2.1	scrap/you/you.s