* miscellaneous definitions
HResMaxX equ 639 high resolution X limit
HResMaxY equ 191 high resolution Y limit
MousData equ $0008 arbitrary choice for mouse data area ($0008-$000E)
PcktSize equ 3 number of bytes in mouse data packet
SyncData equ %01000000 initial mouse data byte pattern

* 65C52 register definitions
 org 0
ISReg rmb 1 IRQ Status (read only)
IEReg equ ISReg IRQ Enable (write only)
CSReg rmb 1 Control Status (read only)
CFReg equ CSReg Control/Format (write only)
CDReg rmb 1 Compare Data (write only, unused in this driver)
TBReg equ CDReg Transmit Break (write only)
DataReg rmb 1 receive/transmit Data (read Rx / write Tx)

* IRQ Status/Enable bit definitions
ISE.IRQ equ %10000000 IRQ occurred/enable
ISE.TxE equ %01000000 Tx data register Empty
ISE.CTS equ %00100000 CTS transition
ISE.DCD equ %00010000 DCD transition
ISE.DSR equ %00001000 DSR transition
ISE.FOB equ %00000100 receive data Framing or Overrun error, or Break
ISE.Par equ %00000010 Parity error in Rx data
ISE.RxF equ %00000001 Rx data register Full

ISE.Errs equ ISE.FOB!ISE.Par IRQ Status error bits
ISE.Flip equ $00 all ISR bits active when set
ISE.Mask equ ISE.FOB!ISE.Par!ISE.RxF active IRQs

* Control Status bit definitions
CS.Frame equ %10000000 framing error (set=error)
CS.TxE equ %01000000 Tx data empty (set=empty)
CS.CTS equ %00100000 CTS input (set=disabled)
CS.DCD equ %00010000 DCD input (set=disabled)
CS.DSR equ %00001000 DSR input (set=disabled)
CS.Break equ %00000100 Rx line break (set=received break)
CS.DTR equ %00000010 DTR output (set=disabled)
CS.RTS equ %00000001 RTS output (set=disabled)

* Control bit definitions
C.TBRCDR equ %01000000 Tx Break/Compare Data register access (set=Tx Break)
C.StpBit equ %00100000 stop bits (set=two, clear=one)
C.Echo equ %00010000 local echo (set=activated)
C.Baud equ %00001111 see baud rate table below

* baud rate table
 org 0
BR.00050 rmb 1 50 baud
BR.00110 rmb 1 109.2 baud
BR.00135 rmb 1 134.58 baud
BR.00150 rmb 1 150 baud
BR.00300 rmb 1 300 baud
BR.00600 rmb 1 600 baud
BR.01200 rmb 1 1200 baud
BR.01800 rmb 1 1800 baud
BR.02400 rmb 1 2400 baud
BR.03600 rmb 1 3600 baud
BR.04800 rmb 1 4800 baud
BR.07200 rmb 1 7200 baud
BR.09600 rmb 1 9600 baud
BR.19200 rmb 1 19200 baud
BR.38400 rmb 1 38400 baud
BR.ExClk rmb 1 external Rx and Tx clocks

* Format bit definitions
F.Slct equ %10000000 register select (set=Format, clear=Control)
F.DatBit equ %01100000 see data bit table below
F.Par equ %00011100 see parity table below
F.DTR equ %00000010 DTR output (set=disabled)
F.RTS equ %00000001 RTS output (set=disabled)

* data bit table
DB.5 equ %00000000 five data bits per character
DB.6 equ %00100000 six data bits per character
DB.7 equ %01000000 seven data bits per character
DB.8 equ %01100000 eight data bits per character

* parity table
Par.None equ %00000000
Par.Odd equ %00000100
Par.Even equ %00001100
Par.Mark equ %00010100
Par.Spac equ %00011100

* Transmit Break bit definitions
TB.Brk equ %00000010 Tx break control (set=transmit continuous line Break)
TB.Par equ %00000001 parity check (set=parity bit to ISE.Par, clear=normal)

* Buffer (0,u only) bit definitions
B.Butn1 equ %00100000 button #1 (left, 1 = pressed)
B.Butn2 equ %00010000 button #2 (right, 1 = pressed)

B.Butns equ B.Butn1!B.Butn2 mask for all buttons


* mouse static data area definitions
 org 0
Buffer rmb 2 Rx buffer for mouse data (must start at 0,u)
Counter rmb 1 Rx data counter
CrntXPos rmb 2 mouse X position (0 to HResMaxX)
CrntYPos rmb 2 mouse Y position (0 to HResMaxY*2)