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decimal
: .#### base @ >r hex
0 <# # # # # #> type space r> base ! ;
variable ndp : here ndp @ ;
variable src variable dst variable pc $10 pc !
Variable pc-old
variable zf
variable sf
variable cf
variable accu
variable mem-size 128 1024 * mem-size !
mem-size @ allocate throw
constant mem
0 ndp !
\ Jumping
: pc> src @ 2* pc @ + ;
: >pc pc ! ;
: >pcsf sf @ IF >pc ELSE drop THEN ;
: >pczf zf @ IF >pc ELSE drop THEN ;
: >pccf cf @ IF >pc ELSE drop THEN ;
\ Memory
: ram> 2* mem + dup c@ 8 lshift swap char+ c@ or ;
: >ram 2* mem + over 8 rshift over c! char+ c! ;
\ IO
variable nesting 0 nesting !
: .hs
." RP: " $12 ram> .####
." SP: " $13 ram> .####
." UP: " $14 ram> .#### ;
: >txd
\ cr nesting @ spaces
\ $15 ram> ." IP: " .#### .hs
\ dup CASE [char] : OF 1 nesting +! ENDOF
\ [char] ; OF -1 nesting +! ENDOF ENDCASE
dup bl < IF
CASE
#cr OF ENDOF
#lf OF cr ENDOF
[IFDEF] del #bs OF del ENDOF [THEN]
dup emit ENDCASE
ELSE emit THEN
[IFDEF] tflush tflush [ELSE] key? drop [THEN] ;
: tx?> 1 ;
: rxd> key [IFDEF] curon curon [THEN] ;
: rx?> key? 1 and ;
\ Arithmetic
: accu! ( u -- ) dup 0= zf ! dup $8000 and 0<> sf ! $FFFF and accu ! ;
: >shr cf @ >r dup 1 and 0<> cf !
1 rshift r> IF $8000 or THEN accu! ;
: >xor accu @ xor accu! ;
: >or accu @ or accu! ;
: >and accu @ and accu! ;
: (>sub) 2dup u< cf ! - accu! ;
: >sub9 accu @ swap (>sub) ;
: >subA accu @ (>sub) ;
: >add accu @ + $FFFF and dup accu @ u< cf ! accu! ;
: sf> sf @ 1 and ;
: zf> zf @ 1 and ;
: cf> cf @ 1 and ;
: accu> accu @ ;
: >accu accu! ;
: aind> accu @ ram> ;
: >aind accu @ >ram ;
: crash -$200 throw ;
create table>
' crash , ' tx?> , ' rxd> , ' rx?> ,
' pc> , ' pc> , ' pc> , ' pc> ,
' crash , ' crash , ' crash , ' aind> ,
' accu> , ' sf> , ' zf> , ' crash ,
' cf> , ' crash , ' crash , ' crash ,
create >table
' >txd , ' crash , ' crash , ' crash ,
' >pc , ' >pcsf , ' >pczf , ' crash ,
' >pccf , ' crash , ' crash , ' >aind ,
' >accu , ' >sub9 , ' >suba , ' >add ,
' >xor , ' >or , ' >and , ' >shr ,
: special? ( n -- ) $10 $FFFC within 0= ;
' special? ALIAS special>? ' special? ALIAS >special?
: dotable ( /trans table n -- trans/ )
4 + $FFFF and cells + perform ;
: do> ( -- val )
src @ >special?
IF table> src @ dotable
ELSE src @ ram>
THEN ;
: >do ( val -- )
dst @ >special?
IF >table dst @ dotable
ELSE dst @ >ram
THEN ;
variable trans -1 trans !
: .stat
." PC: " pc-old @ .####
." : " src @ .####
." -( " trans @ .####
." )-> " dst @ .####
." ACCU: " accu @ .#### ;
variable steps 0 steps !
: step 1 steps +!
pc @ pc-old !
pc @ ram> src !
pc @ 1+ ram> dst !
do> pc @ 2 + pc !
dup trans !
>do ;
: s step .stat cr ;
: load
bl word count r/o bin open-file throw >r
mem mem-size @ r@ read-file throw
r> close-file throw
. cr ;
: n, ndp @ >ram 1 ndp +! ;
\ DUMP 2may93jaw - 9may93jaw 06jul93py
Variable /dump
: .4 ( addr -- addr' )
3 FOR -1 /dump +! /dump @ 0<
IF ." " ELSE dup c@ 0 <# # # #> type space THEN
char+ NEXT ;
: .chars ( addr -- )
/dump @ bounds
?DO I c@ dup $7F bl within
IF drop [char] . THEN emit
LOOP ;
: .line ( addr -- )
dup .4 space .4 ." - " .4 space .4 drop 10 /dump +! space .chars ;
: d ( addr u -- )
swap 2* mem + swap
cr base @ >r hex \ save base on return stack
0 ?DO I' I - 10 min /dump !
dup mem - 2/ 8 u.r ." : " dup .line cr 10 +
10 +LOOP
drop r> base ! ;
defer end? ' noop IS end?
variable t1 variable t2
: token2 t1 @ src @ = t2 @ dst @ = and or ;
: jmp? dst @ 5 < or ;
: surejmp? dst @ 0= or ;
: st
dup ram> t1 ! 1+ ram> t2 !
['] token2 IS end? ;
: stepinto BEGIN step false end? UNTIL ;
: g
[IFDEF] curon curon [THEN]
BEGIN step AGAIN
[IFDEF] curoff curoff [THEN] ;
: si stepinto ." Stopped" cr .stat cr ;
variable stepcnt
: sq s
BEGIN key steps @ stepcnt ! CASE
[char] q OF EXIT ENDOF
[char] j OF ['] jmp? IS end? stepinto ENDOF
[char] s OF ['] surejmp? IS end? stepinto ENDOF
[char] g OF ['] g catch -$200 = IF ." crashed " THEN ENDOF
step
ENDCASE
." [" steps @ stepcnt @ - 0 <# #S #> type ." ]"
.stat cr
AGAIN ;
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