pato-z80-home-computer/assembly/bios/main.asm

jp Sysinit     ; Startup vector: DO NOT MOVE! Must be the first instruction

; Pat80 BIOS v0.01
; @author: Daniele Verducci
;
; MEMORY MAP
;   ROM is at 0x0000
;   RAM is at 0x8000
;       SYSTEM VAR SPACE: 0x8000 - 0x8FFF (4kb)
;       DRIVERS VAR SPACE: 0x9000 - 0x9FFF (4kb)
;       APPLICATION VAR SPACE: 0xA000 - 0xFFFF (24kb)
; I/O MAP
;   I/O 0 (0x00 - 0x1F) Parallel terminal (uses addr 0x00 only)
;   I/O 1 (0x20 - 0x3F) Sound card (uses addr 0x20 only)
;   I/O 2 (0x40 - 0x5F)
;   I/O 3 (0x60 - 0x7F)
;   I/O 4 (0x80 - 0x9F)
;   I/O 5 (0xA0 - 0xBF)
;   I/O 6 (0xC0 - 0xDF)
;   I/O 7 (0xE0 - 0xFF)


; MEMORY CONFIGURATION
SYS_VAR_SPACE: EQU 0x8000
DRV_VAR_SPACE: EQU 0x9000
APP_SPACE: EQU 0xA000

; SYSTEM CONFIGURATION
IO_0: EQU 0x00
IO_1: EQU 0x20
IO_2: EQU 0x40
IO_3: EQU 0x60
IO_4: EQU 0x80
IO_5: EQU 0xA0
IO_6: EQU 0xC0
IO_7: EQU 0xE0






;include 'drivers/hd44780.asm'
;include 'drivers/keyboard.asm'
include 'drivers/arduino_terminal.asm'
include 'drivers/sn76489.asm'
include 'monitor.asm'
include 'libs/time.asm'
;include 'tests/sndtest.asm'


; **** SYSTEM CALLS ****

; Prints string
; @param BC Pointer to a null-terminated string first character
Print:
    call Term_print
    ret

; Writes a single character
; @param A Value of character to print
Printc:
    call Term_printc
    ret

; Reads a single character
; @return A The read character
Readc:
    call Term_readc
    ret

; Reads a line
; @return BC The pointer to a null-terminated read string
Readline:
    call Term_readline
    ret

; Emits system beep
Beep:
    call Snd_beep
    ret

; **** SYSTEM INITIALIZATION ****
Sysinit:
    ; Init snd driver
    call Snd_init

    ; Init video
    ; TODO

    ; Wait for audio amp to unmute
    ld bc, TIME_DUR_SECOND
    call Time_delay55

    ; Play startup sound
    call Beep

    ; Run memory monitor
    call Monitor_main

    halt