TIMER7 = $FD1C
HTIMER = $FD00 ; horizontal line timer (timer 0)
VTIMER = $FD08 ; vertical blank timer (timer 2)
+STIMER = $FD1C ; sound timer (timer 7)
HTIMBKUP = $FD00 ; horizontal line timer (timer 0)
HTIMCTLA = $FD01
VTIMCNT = $FD0A
VTIMCTLB = $FD0B
BAUDBKUP = $FD10 ; serial timer (timer 4)
+STIMBKUP = $FD1C ; sound timer (timer 7)
+STIMCTLA = $FD1D
+STIMCNT = $FD1E
+STIMCTLB = $FD1F
TIM0BKUP = $FD00
TIM0CTLA = $FD01
HBL_INTERRUPT = TIMER0_INTERRUPT
VBL_INTERRUPT = TIMER2_INTERRUPT
SERIAL_INTERRUPT = TIMER4_INTERRUPT
+SND_INTERRUPT = TIMER7_INTERRUPT
INTRST = $FD80
INTSET = $FD81