--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/defs/m51.defs	Fri Jul 26 01:26:29 2002 +0000
@@ -0,0 +1,95 @@
+
+* 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
+
+* 6551 register definitions
+ org 0
+DataReg rmb 1 receive/transmit data
+StatReg rmb 1 IRQ/DSR/DCD/error status (read only)
+PRstReg equ StatReg programmed reset (write only)
+CmdReg rmb 1 command (parity/echo/Tx IRQ/Rx IRQ/DTR)
+CtrlReg rmb 1 control (stop bits/word length/Rx clock/baud rate)
+
+* Status bit definitions
+Stat.IRQ equ %10000000 IRQ occurred
+Stat.DSR equ %01000000 current DSR input level (0=enabled, 1=disabled)
+Stat.DCD equ %00100000 current DCD input level (0=enabled, 1=disabled)
+Stat.TxE equ %00010000 Tx register empty
+Stat.RxF equ %00001000 Rx register full
+Stat.Ovn equ %00000100 overrun error
+Stat.Frm equ %00000010 framing error
+Stat.Par equ %00000001 parity error
+
+Stat.Err equ Stat.Ovn!Stat.Frm!Stat.Par status error bits
+Stat.Flp equ $00 all status bits active when set
+Stat.Msk equ Stat.RxF!Stat.Ovn!Stat.Frm!Stat.Par active IRQ bits
+
+* Command bit definitions
+Cmd.Par equ %11100000 see parity table below
+Cmd.Echo equ %00010000 Rx echo (0=disabled, 1=enabled)
+Cmd.TxIC equ %00001100 see Tx IRQ control table below
+Cmd.RxIE equ %00000010 Rx IRQ enable (0=enabled, 1=disabled)
+Cmd.DTR equ %00000001 DTR output (0=disabled, 1=enabled)
+
+* parity table
+Par.None equ %00000000
+Par.Odd equ %00100000
+Par.Even equ %01100000
+Par.Mark equ %10100000
+Par.Spac equ %11100000
+
+* Tx IRQ control table
+TIC.Off equ %00000000 RTS disabled, Tx IRQ disabled
+TIC.On equ %00000100 RTS enabled, Tx IRQ enabled
+TIC.RTS equ %00001000 RTS enabled, Tx IRQ disabled
+TIC.Brk equ %00001100 RTS enabled, Tx line break
+
+* Control bit definitions
+Ctl.Stop equ %10000000 stop bits (clear=1, set=2)
+Ctl.DBit equ %01100000 see data bit table below
+Ctl.RClk equ %00010000 Rx clock source (0=external, 1=internal)
+Ctl.Baud equ %00001111 see baud rate table below
+
+* data bit table
+DB.5 equ %01100000 five data bits per character
+DB.6 equ %01000000 six data bits per character
+DB.7 equ %00100000 seven data bits per character
+DB.8 equ %00000000 eight data bits per character
+
+* baud rate table
+ org 0
+BR.ExClk rmb 1 16x external clock
+BR.00050 rmb 1 50 baud
+BR.00075 rmb 1 75 baud
+BR.00110 rmb 1 109.92 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
+
+* 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)
+