Commodore Amiga A500 - Page 148

jio-Com2lntEnableR EQU SOOdd
jio-Com2DivisorLSB EQU $007f
jio-CornZDivisorMSB EQU S009f
jio-Com2lntlD EQU $OOff
jio-ComZLineCntrl EQU $01 l f
jio-ComZModemCntrl EQU $01 3f
jio-CornZLineStatus EQU $01 5f
jio-ComZModemStatus EQU $01 7f
jio-Lptl Data
EQU $0 1
9f ; data byte
jio-Lptl Status
EQU
$01 bf ; see equates below
jio-Lptl Control
EQU
$01 df ; see equates below
jio-MonoAddresslnd EQU $Olff ; current index into crt data regs
jio-MonoData
EQU $02a 1 ; every other byte for 16 registers
jio-MonoControlReg EQU $02ff
jio-ColorAddresslnd
EQU $021 f ; current index into crt data regs
jio-ColorData
EQU $02~ l ; every other byte for 1 6 register;
jio-ColorControlReg EQU S023f
jio-ColorSelectReg EQU S025f
jio-ColorStatusReg EQU S027f
jio-DisplaySystemReg EQU $029f
EQU $lffl ; read clears, pc -> amiga ints
EQU
$lff3 ; rlo, amiga -> pc ints
EQU $1 ff!5 ; rlo, strobe release pc's reset
EQU
$1 ff7 ; rlo, give ram addresses
EQU
$lff9 ; rlw, enables pc int lines
EQU
$1 ffb ; wlo, bit = = 0 -> cause pc int
EQU
$1 ffd ; wlo, random control lines
EQU $1 fff ; rlw, sets expansion ram base
address
; Now the magic bits in each register (and boy, are there a lot of
them!)
; Bits for Lptl Status register
BITDEF
JPCLS,STROBE,O
BITDEF JPCLS,AUTOFEED,l
BITDEF JPCLS,INIT.2
BITDEF JPCLS.SELECTIN.3
BITDEF
JPCLSJRQENABLEA ; active 1
; Bits for Lpt 1 Control register
BITDEF
JPCLC,ERROR,3
BITDEF
JPCLC,SELECTA