2021-05-22 23:55:47 +02:00
|
|
|
;=========================================
|
|
|
|
|
; initialized data
|
|
|
|
|
include_debug_strings ; for debug-fdo
|
|
|
|
|
|
|
|
|
|
chip8_fontset db \
|
|
|
|
|
0xF0, 0x90, 0x90, 0x90, 0xF0, \ ; 0
|
|
|
|
|
0x20, 0x60, 0x20, 0x20, 0x70, \ ; 1
|
|
|
|
|
0xF0, 0x10, 0xF0, 0x80, 0xF0, \ ; 2
|
|
|
|
|
0xF0, 0x10, 0xF0, 0x10, 0xF0, \ ; 3
|
|
|
|
|
0x90, 0x90, 0xF0, 0x10, 0x10, \ ; 4
|
|
|
|
|
0xF0, 0x80, 0xF0, 0x10, 0xF0, \ ; 5
|
|
|
|
|
0xF0, 0x80, 0xF0, 0x90, 0xF0, \ ; 6
|
|
|
|
|
0xF0, 0x10, 0x20, 0x40, 0x40, \ ; 7
|
|
|
|
|
0xF0, 0x90, 0xF0, 0x90, 0xF0, \ ; 8
|
|
|
|
|
0xF0, 0x90, 0xF0, 0x10, 0xF0, \ ; 9
|
|
|
|
|
0xF0, 0x90, 0xF0, 0x90, 0x90, \ ; A
|
|
|
|
|
0xE0, 0x90, 0xE0, 0x90, 0xE0, \ ; B
|
|
|
|
|
0xF0, 0x80, 0x80, 0x80, 0xF0, \ ; C
|
|
|
|
|
0xE0, 0x90, 0x90, 0x90, 0xE0, \ ; D
|
|
|
|
|
0xF0, 0x80, 0xF0, 0x80, 0xF0, \ ; E
|
|
|
|
|
0xF0, 0x80, 0xF0, 0x80, 0x80 ; F
|
|
|
|
|
|
|
|
|
|
opcode dw 0 ; operation code
|
|
|
|
|
V db 16 dup(0) ; 16 8-bit registers
|
|
|
|
|
I dw 0 ; additional register (usually used for storing addresses)
|
|
|
|
|
P_C dw 0 ; program counter
|
|
|
|
|
S_P dw 0 ; stack pointer
|
|
|
|
|
delay_timer db 0
|
|
|
|
|
sound_timer db 0
|
|
|
|
|
stackmem dw STACK_SIZE dup(0) ; stack memory
|
|
|
|
|
key db KEY_SIZE dup (0) ; keyboard
|
|
|
|
|
chip8_draw_flag db 0
|
|
|
|
|
next_rand dd 1
|
|
|
|
|
|
|
|
|
|
align 4
|
|
|
|
|
fread_struct:
|
|
|
|
|
.subfunction dd 0 ; + 0
|
|
|
|
|
.offset_low dd 0 ; + 4
|
|
|
|
|
.offset_high dd 0 ; + 8
|
|
|
|
|
.size dd MAX_GAME_SIZE ; + 12
|
|
|
|
|
.buffer dd memory + 0x200 ; + 16
|
|
|
|
|
db 0 ; + 20
|
|
|
|
|
.filename: dd 0 ; + 24
|
|
|
|
|
|
|
|
|
|
sys_colors system_colors
|
|
|
|
|
main_window_title db 'CHIP-8 Emulator',0
|
|
|
|
|
|
2021-05-23 19:10:32 +02:00
|
|
|
imgbuf_ptr dd ? ; pointer to in-memory image buffer
|
|
|
|
|
|
2021-05-22 23:55:47 +02:00
|
|
|
;=========================================
|
|
|
|
|
align 16
|
|
|
|
|
_i_end:
|
|
|
|
|
; uninitialized data
|
|
|
|
|
cmdline rb 1024 ; reserve for command line arguments
|
|
|
|
|
|
|
|
|
|
memory rb MEM_SIZE
|
|
|
|
|
gfx rb GFX_SIZE
|
|
|
|
|
|
|
|
|
|
;tmp_buf rb 128
|
