;
; os.inc -- Operating System Registers and Vectors
;
; Steve Ginzburg, Jun 4 1998
; Bret Victor, Sept 12, 1998

; system vectors

sys_vectors    equ $ffa7
sys_rts        equ $ffa7
sys_status     equ $ffa8
sys_getc       equ $ffab
sys_putc       equ $ffae
sys_isachar    equ $ffb1
sys_audio      equ $ffb4
sys_reserved1  equ $ffb7
sys_reserved2  equ $ffba
sys_reserved3  equ $ffbd

RESETVECTOR   equ $fffe

; system registers

timercounter  equ $0020	; result of timer counter
audiodelay    equ $0022	; delay for audio "half-wavelength"
gfxdelay      equ $0024	; delay between user_gfxhook calls

hookbase      equ $0030
userhookvec   equ $0030	; vector to user hook routine
audiohookvec  equ $0033	; vector to audio hook routine
gfxhookvec    equ $0036	; vector to gfx refresh hook routine
irqhookvec    equ $0039 ; vector called at irq
swihookvec    equ $003c	; vector called during software interrupt

sysdirpage    equ $0040 ; start of direct page storage for system code
userdirpage   equ $0060 ; start of direct page storage for user code