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MU3.MAC
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2000-06-30
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854 lines
;
; Program: MU3
; Author: Richard Conn
; Version: 1.0
; Date: 30 June 84
; Previous Versions: None
;
vers equ 10
z3env equ 0f400h
;
; MU3 is the ZCPR3 Memory Utility. It allows the user to display
; blocks of memory, edit them, and perform general memory-oriented
; manipulation. See the file MU3.HLP for usage details.
;
;
; General Equates
;
bs equ 08h
cr equ 0dh
lf equ 0ah
fcb equ 5ch
dim equ 1 ;goto standout mode
bright equ 2 ;exit standout mode
EOLCH EQU 0 ;END OF LINE CHAR
SEPCH EQU ',' ;SEPARATOR CHAR
EROW EQU 6 ;FIRST ROW OF EDITOR DISPLAY
ECOL EQU 4 ;FIRST COL OF EDITOR DISPLAY
ECOLC EQU ECOL+16*3+8 ;FIRST COL OF EDITOR CHAR DISPLAY
ECURS EQU '>' ;EDITOR CURSOR
PRROW EQU 22 ;PROMPT ROW
PRCOL EQU 10 ;PROMPT COLUMN
PRCOLI EQU PRCOL+15 ;PROMPT INPUT COL
ERROW EQU 23 ;ERROR MESSAGE ROW
ERCOL EQU 15 ;ERROR MESSAGE COLUMN
;
; SYSLIB/Z3LIB/VLIB Externals
;
ext z3vinit,envptr,codend,putcl
ext cls,gotoxy,ereol,at,vprint,stndout
ext cout,crlf,cin,caps
ext bline,sksp
ext phl4hc,pa2hc,phlfdc
;
; Environment Definition
;
if z3env ne 0
;
; External ZCPR3 Environment Descriptor
;
jmp start
db 'Z3ENV' ;This is a ZCPR3 Utility
db 1 ;External Environment Descriptor
z3eadr:
dw z3env
start:
lhld z3eadr ;pt to ZCPR3 environment
;
else
;
; Internal ZCPR3 Environment Descriptor
;
MACLIB Z3BASE.LIB
MACLIB SYSENV.LIB
z3eadr:
jmp start
SYSENV
start:
lxi h,z3eadr ;pt to ZCPR3 environment
endif
;
; Start of Program -- Initialize ZCPR3 Environment
;
call z3vinit ;initialize the ZCPR3 Env and the VLIB Env
;
; DEFINE FREE SPACE
;
CALL CODEND ;DETERMINE ADDRESS
MVI M,126 ;126 CHARS INPUT ALLOWED
SHLD BUFFER ;SET PTR
;
; SET UP ARROW KEYS
;
LHLD ENVPTR ;PT TO ENVIRONMENT DESCRIPTOR
LXI D,80H+10H ;PT TO ARROW KEY INFO
DAD D
LXI D,EDCURT ;PT TO CURSOR TABLE
MVI B,4 ;4 ARROW KEYS
ARROW:
MOV A,M ;GET CHAR
STAX D ;STORE CHAR
INX H ;PT TO NEXT
INX D ;PT TO NEXT ENTRY
INX D
INX D
DCR B ;COUNT DOWN
JNZ ARROW
;
; Check for Command Line Parameter
;
lxi h,fcb+1 ;pt to first char
mov a,m ;get char
cpi ' ' ;no param?
jnz pcheck
lhld envptr ;pt to environment descriptor
jmp mu3
;
; We have a parameter
;
pcheck:
cpi '/' ;help?
jz help
call hexin ;convert to binary
xchg ;HL=value
jmp mu3
;
; Print help message
;
help:
call vprint
db cr,lf,'Syntax:'
db cr,lf,' MU3 <-- Invoke MU3 at Env Desc'
db cr,lf,' MU3 <hex adr> <-- Invoke MU3 at Address'
db 0
ret
;
; Erase to EOL
; If fct not supported, send out B spaces and B backspaces
;
vereol:
call ereol ;try erase
rnz
push b ;save B
mvi a,' ' ;send spaces
call vereol1
pop b ;get B
mvi a,bs ;send backspaces
vereol1:
call cout ;send char in A
dcr b
jnz vereol1
ret
;
; Clear Screen
; If fct not supported, write 24 CRLFs
;
vcls:
call cls ;try clear
rnz
push b ;save B
mvi b,24 ;count
vcls1:
call crlf
dcr b
jnz vcls1
pop b
ret
;
; Run MU3
; HL contains starting address
;
mu3:
SHLD BLOCK ;SAVE PTR TO BLOCK
;
; REFRESH EDIT SCREEN
;
EDIT0:
CALL VCLS ;NEW SCREEN
CALL AT
DB 2,26 ;ROW 2, COL 26
CALL VPRINT ;BANNER
DB 'MU3 Memory Editor, Version '
DB (VERS/10)+'0','.',(VERS MOD 10)+'0'
DB 0
CALL AT ;POSITION FOR VALUE TEXT
DB 3,67
CALL VPRINT
DB DIM,'Value',BRIGHT,0
MVI H,EROW+9 ;POSITION FOR COMMAND DISPLAY
MVI L,1
CALL GOTOXY ;POSITION CURSOR
CALL VPRINT ;PRINT COMMAND SUMMARY
DB ' -- Movement --'
DB ' -------------- Operation ---------------',CR,LF
DB ' ^E '
DB 'A',DIM,' Enter Address ',BRIGHT
DB ' +',DIM,' Next Block',BRIGHT,CR,LF
DB ' ^ '
DB 'H',DIM,' Hex Calculator ',BRIGHT
DB ' -',DIM,' Last Block',BRIGHT,CR,LF
DB ' ^S <-+-> ^D '
DB 'N',DIM,' Enter Hex Numbers ',BRIGHT
DB ' ^R',DIM,' Replot Screen',BRIGHT,CR,LF
DB ' v '
DB 'T',DIM,' Enter Text ',BRIGHT
DB ' ^C',DIM,' Exit MU3',BRIGHT,CR,LF
DB ' ^X '
DB 'C',DIM,' Enter Command Line',BRIGHT
DB 0
;
; REENTER MU3 WITH PTRS RESET
;
MU3R:
XRA A ;A=0
STA EINDEX ;SET INDEX TO 0 (FIRST ELEMENT)
STA EDERR ;SET NO PREVIOUS ERROR
CALL EDPLOT ;PLOT BUFFER DATA
;
; INPUT EDITOR COMMAND
;
EDITCMD:
CALL EDERCL ;CLEAR EDITOR INVALID COMMAND MESSAGE
EDITCMD1:
CALL PRMSG ;POSITION AT PROMPT MESSAGE
DB DIM,'MU3 Command?',BRIGHT,0
CALL PRINP ;POSITION AT PROMPT INPUT
DB 0
CALL CIN ;GET CHAR
CALL CAPS ;CAPITALIZE
MOV B,A ;COMMAND IN B
LXI H,EDCURT ;PROCESS CURSOR COMMANDS FIRST
CALL CMD ;PROCESS COMMAND
LXI H,ECMDTBL ;EDITOR COMMAND TABLE
CALL CMD ;PROCESS COMMAND
MVI A,0FFH ;SET ERROR FLAG
STA EDERR
CALL ERMSG ;ERROR MESSAGE
DB 'Invalid Command',0
JMP EDITCMD1
;
; Position at Prompt Message and Print it
;
PRMSG:
CALL AT ;POSITION
DB PRROW,PRCOL
JMP VPRINT ;PRINT IT
;
; Position at Prompt Input and Print Prompt
;
PRINP:
CALL AT ;POSITION
DB PRROW,PRCOLI
JMP VPRINT ;PRINT IT
;
; Position at Error Message and Print It
;
ERMSG:
CALL AT ;POSITION
DB ERROW,ERCOL
JMP VPRINT ;PRINT IT
;
;INPUT ERROR
;
WHAT:
MVI A,0FFH ;SET ERROR FLAG
STA EDERR
CALL ERMSG
DB 'Value Error',0
JMP EDITCMD1
;
;Command Table Search and Execute
;
CMD:
MOV A,M ;CHECK FOR END OF TABLE
ORA A
RZ ;COMMAND NOT FOUND
CMP B ;MATCH?
JZ CMDRUN
INX H ;SKIP TO NEXT ENTRY IN TABLE
INX H
INX H
JMP CMD
;
;RUN COMMAND
;
CMDRUN:
INX H ;PT TO LOW ADDRESS
MOV E,M
INX H ;PT TO HIGH ADDRESS
MOV D,M
XCHG
POP PSW ;CLEAR STACK
PCHL ;RUN ROUTINE
;
;PLOT BUFFER DATA
;
EDPLOT:
MVI H,EROW-1 ;SET ROW
MVI L,ECOL ;SET COLUMN
CALL GOTOXY ;POSITION CURSOR
CALL VPRINT
DB DIM
DB ' 0 1 2 3 4 5 6 7 8 9 A B C D E F'
DB BRIGHT,0
INR H ;NEXT ROW
CALL GOTOXY ;POSITION CURSOR
XCHG ;POSITION IN DE
LHLD BLOCK ;PT TO DATA
MVI B,8 ;8 LINES
;
;Print Next Line on Screen
;
EDIT00:
CALL STNDOUT ;GO DIM
MOV A,H ;OUTPUT ADDRESS
CALL PA2HC
MOV A,L
CALL PA2HC
CALL VPRINT
DB ':',BRIGHT,' ',0
MVI C,16 ;16 ELEMENTS
EDIT01:
MOV A,M ;GET BYTE
CALL PA2HC ;PRINT AS HEX
CALL SPACE ;PRINT 1 SPACE
INX H ;PT TO NEXT
DCR C ;COUNT DOWN
JNZ EDIT01
XCHG ;POSITION AGAIN
INR H ;NEXT ROW
CALL GOTOXY
XCHG
DCR B ;COUNT DOWN
JNZ EDIT00
MVI H,EROW ;RESET ROW
MVI L,ECOLC ;RESET COL
CALL GOTOXY ;POSITION CURSOR
XCHG ;POSITION IN DE
LHLD BLOCK ;PT TO DATA
MVI B,8 ;8 LINES
EDIT02:
CALL BAR ;PRINT BAR
MVI C,16 ;16 ELEMENTS
EDIT03:
MOV A,M ;GET BYTE
ANI 7FH ;MASK MSB
CPI 7FH ;DON'T PRINT 7FH
JZ EDIT7F
CPI ' ' ;SPACE OR MORE?
JNC EDIT04
EDIT7F:
MVI A,'.' ;PRINT DOT
EDIT04:
CALL COUT ;PRINT BYTE
INX H ;PT TO NEXT
DCR C ;COUNT DOWN
JNZ EDIT03
CALL BAR ;PRINT ENDING BAR
XCHG ;POSITION AGAIN
INR H ;NEXT ROW
CALL GOTOXY
XCHG
DCR B ;COUNT DOWN
JNZ EDIT02
CALL EDCUR ;POSITION CURSOR
RET
;
;EDITOR COMMAND TABLE
;
ECMDTBL:
DB CR ;NOP
DW EDITCMD
DB 'C'-'@' ;^C = EXIT MU3
DW EDCC
DB 'R'-'@' ;^R = REFRESH
DW EDIT0
DB 'E'-'@' ;^E=UP
DW EDUP
DB 'X'-'@' ;^X=DOWN
DW EDDOWN
DB 'D'-'@' ;^D=RIGHT
DW EDRIGHT
DB 'S'-'@' ;^S=LEFT
DW EDLEFT
DB ' ' ;NOP
DW EDITCMD
DB '+' ;ADVANCE
DW EDITPLUS
DB '-' ;BACKUP
DW EDITMINUS
DB 'A' ;ADDRESS
DW EDITADR
DB 'C' ;COMMAND LINE
DW EDITCL
DB 'H' ;HEX CALC
DW EDITCALC
DB 'N' ;CHANGE NUMBERS
DW EDITHEX
DB 'T' ;CHANGE TEXT
DW EDITALP
DB 0 ;END OF TABLE
;
; ARROW KEY DEFINITONS FROM TCAP
;
EDCURT:
DB 0 ;0 INDICATES NO ARROW KEYS
DW EDUP
DB 0
DW EDDOWN
DB 0
DW EDRIGHT
DB 0
DW EDLEFT
DB 0 ;END OF TABLE
;
;Enter Command Line
;
EDITCL:
CALL EDERCL ;CLEAR ERROR LINE
CALL CRLF ;NEW LINE
CALL VPRINT ;PROMPT INPUT
DB DIM,'Command Line? ',BRIGHT,0
CALL RDBUF ;INPUT TEXT
CALL PUTCL ;STORE COMMAND LINE
JMP CRLF ;NEW LINE
;
;Enter ASCII Chars
;
EDITALP:
CALL EDERCL ;CLEAR ERROR LINE
CALL PRINP ;PROMPT INPUT
DB DIM,'Enter Text (<hh> for Hex)',BRIGHT
DB CR,LF,' --> ',0
CALL RDBUF ;INPUT TEXT WITHOUT PROMPT
CALL EDPRCL ;CLEAR PROMPT LINE
LDA EINDEX ;PT TO POSITION
XCHG
LHLD BLOCK ;COMPUTE OFFSET
XCHG
ADD E
MOV E,A
MOV A,D
ACI 0
MOV D,A ;DE PTS TO BYTE, HL PTS TO TEXT
EDITA1:
MOV A,M ;GET CHAR
CPI EOLCH ;EOL?
JZ EDITA2 ;REFRESH SCREEN
CALL GETVAL ;GET ASCII OR <HEX> VALUE
STAX D ;UPDATE BYTE
INX H ;PT TO NEXT INPUT CHAR
INR E ;PT TO NEXT BUFFER BYTE
JNZ EDITA1
EDITA2:
CALL EDPLOT ;REPLOT
JMP EDITCMD1 ;DONE-REFRESH SCREEN
;
;Calculate Sum and Differences
;
EDITCALC:
CALL EDERCL ;CLEAR ERROR LINE
CALL PRINP ;PROMPT INPUT
DB DIM,'Enter Two Hex Numbers - ',BRIGHT,0
CALL RDBUF ;INPUT TEXT
CALL EDPRCL ;CLEAR PROMPT LINE
CALL SKSP ;SKIP TO NON-SPACE
MOV A,M ;ANY INPUT?
ORA A ;0=NO
JZ EDITCMD1
CALL HEXIN ;EVALUATE FIRST NUMBER
CALL SKSP ;SKIP TO 2ND NUMBER
PUSH D ;SAVE FIRST NUMBER
CALL HEXIN ;EVALUATE 2ND NUMBER
POP H ;GET FIRST NUMBER
CALL ERMSG ;PRINT ERROR MESSAGE
DB 0
CALL PHL4HC ;PRINT FIRST NUMBER
CALL VPRINT
DB DIM,' and ',BRIGHT,0
XCHG
CALL PHL4HC ;PRINT 2ND NUMBER
XCHG
CALL VPRINT
DB ' ',DIM,'Sum = ',BRIGHT,0
PUSH H
DAD D
CALL NUMOUT
POP H
CALL VPRINT
DB ' ',DIM,'Diff = ',BRIGHT,0
MOV A,L ;HL=HL-DE
SUB E
MOV L,A
MOV A,H
SBB D
MOV H,A
CALL NUMOUT
JMP EDITCMD1
;
;Output number in HL in Hex and Decimal
;
NUMOUT:
CALL PHL4HC ;HEX
CALL VPRINT
DB ' (',0
CALL PHLFDC ;DECIMAL FLOATING
MVI A,')' ;CLOSE PAREN
JMP COUT
;
;Enter Numbers
;
EDITHEX:
CALL EDERCL ;CLEAR ERROR LINE
CALL PRINP ;PROMPT INPUT
DB DIM,'Enter Hex Numbers (#nn for Dec)'
DB BRIGHT
DB CR,LF,' --> ',0
CALL RDBUF ;INPUT TEXT WITHOUT PROMPT
CALL EDPRCL ;CLEAR PROMPT LINE
LDA EINDEX ;PT TO POSITION
XCHG
LHLD BLOCK ;COMPUTE OFFSET
XCHG
ADD E
MOV E,A
MOV A,D
ACI 0
MOV D,A ;DE PTS TO BYTE, HL PTS TO TEXT
EDITH1:
MOV A,M ;GET HEX DIGIT
CPI EOLCH ;EOL?
JZ EDITA2 ;REFRESH SCREEN
CPI ' ' ;SKIP SPACES
JNZ EDITH2
INX H ;SKIP SPACE
JMP EDITH1
EDITH2:
PUSH D ;SAVE PTR
CALL HEXIN ;GET VALUE AND POSITION HL
MOV A,E ;... IN A
POP D ;GET PTR
STAX D ;PUT BYTE
INR E ;ADVANCE TO NEXT BYTE
JNZ EDITH1
JMP EDITA2 ;DONE-REFRESH
;
;Clear Editor Invalid Command Message
;
EDERCL:
LDA EDERR ;PREVIOUS ERROR?
ORA A ;0=NO
RZ
XRA A ;CLEAR FLAG
STA EDERR
CALL ERMSG ;CLEAR ERROR MESSAGE
DB 0
MVI B,40 ;40 CHARS MAX
JMP VEREOL
;
;CLEAR PROMPT LINE
;
EDPRCL:
CALL PRINP ;PROMPT LINE
DB 0
MVI B,40 ;40 POSITIONS
CALL VEREOL ;CLEAR TO EOL OR 40 CHARS
CALL AT ;USER INPUT
DB ERROW,1
MVI B,79 ;79 POSITIONS
JMP VEREOL
;
;Input Address
;
EDITADR:
CALL VPRINT
DB 'Address? ',0
CALL RDBUF ;GET USER INPUT
CALL SKSP ;SKIP LEADING SPACES
MOV A,M ;EMPTY LINE?
ORA A
JZ MU3R
CALL HEXIN ;CONVERT FROM HEX
XCHG ;HL = ADDRESS
SHLD BLOCK
JMP MU3R ;REENTER
;
;Advance to Next Block
;
EDITPLUS:
LHLD BLOCK ;ADVANCE TO NEXT BLOCK
LXI D,128 ;128 BYTES
DAD D
SHLD BLOCK
CALL EDPLOT ;REPLOT DATA
JMP EDITCMD
;
;Backup to Last Block
;
EDITMINUS:
LHLD BLOCK ;BACKUP TO LAST BLOCK
LXI D,-128 ;128 BYTES
DAD D
SHLD BLOCK
CALL EDPLOT ;REPLOT DATA
JMP EDITCMD
;
;Exit MU3
;
EDCC:
CALL EDERCL ;CLEAR ERROR LINE
JMP CRLF ;NEW LINE
;
;EDIT MOVE: UP
;
EDUP:
CALL EDCCUR ;CLEAR CURSOR
LDA EINDEX ;BACKUP INDEX BY 16
SUI 16
;
;Common EDIT MOVE Routine - on input, A=new index
;
EDMOVE:
ANI 7FH ;MOD 128
STA EINDEX
CALL EDCUR ;SET CURSOR
JMP EDITCMD
;
;EDIT MOVE: DOWN
;
EDDOWN:
CALL EDCCUR ;CLEAR CURSOR
LDA EINDEX ;INCREMENT INDEX BY 16
ADI 16
JMP EDMOVE ;COMMON ROUTINE
;
;EDIT MOVE: RIGHT
;
EDRIGHT:
CALL EDCCUR ;CLEAR CURSOR
LDA EINDEX ;INCREMENT INDEX BY 1
INR A
JMP EDMOVE ;COMMON ROUTINE
;
;EDIT MOVE: LEFT
;
EDLEFT:
CALL EDCCUR ;CLEAR CURSOR
LDA EINDEX ;DECREMENT INDEX BY 1
DCR A
JMP EDMOVE ;COMMON ROUTINE
;
;EDIT SUBROUTINE: EDCUR
; Position Editor Cursor at EINDEX
;EDIT SUBROUTINE: EDCCUR
; Clear Editor Cursor at EINDEX
;
EDCUR:
PUSH H ;SAVE HL
MVI C,ECURS ;CURSOR CHAR
CALL EDSETCUR
CALL AT ;UPDATE DATA
DB 3,74
LDA EINDEX ;PT TO BYTE AT CURSOR
LHLD BLOCK
ADD L
MOV L,A
MOV A,H
ACI 0
MOV H,A ;HL PTS TO BYTE AT CURSOR
MOV A,M ;GET BYTE
CALL PA2HC ;PRINT AS HEX
CALL SPACE
MOV A,M ;GET BYTE
POP H ;RESTORE HL
ANI 7FH ;MASK
CPI 7FH ;7FH AS DOT
JZ EDC7F
CPI ' ' ;OUTPUT CHAR OR DOT
JNC COUT
EDC7F:
MVI A,'.' ;DOT
JMP COUT
EDCCUR:
MVI C,' ' ;CLEAR CURSOR
EDSETCUR:
CALL EDROW ;COMPUTE ROW
ANI 0FH ;COMPUTE COL MOD 16
MOV B,A ;RESULT IN B
ADD A ;*2
ADD B ;*3
ADI ECOL+6 ;ADD IN COL
DCR A ;SUBTRACT 1
MOV L,A ;COL POSITION SET
CALL GOTOXY ;POSITION CURSOR
MOV A,C ;OUTPUT CHAR
JMP COUT
;
;Compute Row from EINDEX
;
EDROW:
LDA EINDEX ;GET INDEX
MOV B,A ;SAVE IN B
RRC ;DIVIDE BY 16
RRC
RRC
RRC
ANI 0FH ;MASK FOR LSB ONLY
ADI EROW ;COMPUTE ROW
MOV H,A ;ROW SET
MOV A,B ;GET INDEX
RET
;
;PRINT A SPACE
;
SPACE:
MVI A,' '
JMP COUT
;
;PRINT AN BARISK IN REV VIDEO
;
BAR:
CALL VPRINT
DB DIM,'|',BRIGHT,0
RET
;
;Get value from input buffer
;
GETVAL:
MOV A,M ;GET NEXT CHAR
CPI '<' ;HEX ESCAPE?
RNZ ;NO, RETURN
;"<<" means one "<"
INX H
MOV A,M
CPI '<'
RZ
;Got hex
PUSH D
CALL HEXIN ;GET VALUE
CPI '>' ;PROPER DELIM?
MOV A,E ;GET VALUE
POP D
RZ
;
;ERROR CONDITION IN SUBROUTINE - CLEAR STACK AND FLAG ERROR
;
SERR:
POP PSW ;CLEAR STACK
JMP WHAT ;ERROR
;
;Input Number from Command Line -- Assume it to be Hex
; Number returned in DE
;
HEXIN:
LXI D,0 ;INIT VALUE
MOV A,M
CPI '#' ;DECIMAL?
JZ HDIN ;MAKE DECIMAL
;
HINLP:
MOV A,M ;GET CHAR
CALL CAPS ;CAPITALIZE
CPI CR ;EOL?
RZ
CPI EOLCH ;EOL?
RZ
CPI SEPCH
RZ
CPI ' ' ;SPACE?
RZ
CPI '-' ;'THRU'?
RZ
CPI '>'
RZ
INX H ;PT TO NEXT CHAR
CPI '0' ;RANGE?
JC SERR
CPI '9'+1 ;RANGE?
JC HINNUM
CPI 'A' ;RANGE?
JC SERR
CPI 'F'+1 ;RANGE?
JNC SERR
SUI 7 ;ADJUST FROM A-F TO 10-15
;
HINNUM:
SUI '0' ;CONVERT FROM ASCII TO BINARY
XCHG
DAD H ;MULT PREVIOUS VALUE BY 16
DAD H
DAD H
DAD H
ADD L ;ADD IN NEW DIGIT
MOV L,A
XCHG
JMP HINLP
;
HDIN:
INX H ;SKIP '#'
;
;Input Number in Command Line as Decimal
; Number is returned in DE
;
DECIN:
LXI D,0
MOV A,M ; GET 1ST CHAR
CPI '#' ; HEX?
JNZ DINLP
INX H ; PT TO DIGIT
JMP HINLP ; DO HEX PROCESSING
;
DINLP:
MOV A,M ;GET DIGIT
CALL CAPS ;CAPITALIZE
CPI '0' ;RANGE?
RC
CPI '9'+1 ;RANGE?
RNC
SUI '0' ;CONVERT TO BINARY
INX H ;PT TO NEXT
PUSH H
MOV H,D
MOV L,E
DAD H ;X2
DAD H ;X4
DAD D ;X5
DAD H ;X10
ADD L ;ADD IN DIGIT
MOV L,A
MOV A,H
ACI 0
MOV H,A
XCHG ;RESULT IN DE
POP H
JMP DINLP
;
; READ LINE FROM USER INTO INPUT LINE BUFFER
;
RDBUF:
LHLD BUFFER ;PT TO BUFFER
XRA A ;DON'T CAPITALIZE
JMP BLINE ;INPUT LINE ROUTINE
;
;EDITOR BUFFERS
;
BLOCK:
DS 2 ;ADDRESS OF CURRENT BLOCK
BUFFER:
DS 2 ;PTR TO FREE SPACE
EINDEX:
DS 1 ;INDEX ENTRY
EDERR:
DS 1 ;ERROR FLAG
EDRUN:
DS 1 ;FLAG SAYING THAT EDITOR IS RUNNING
end