pcat: add native _find

blk/811

@@ -4,7 +4,7 @@ ORG @ 0x25 + HERE ! ( bypass BPB )
 L1 FSET ( start )
 CLI, CLD, AX 0x800 MOVxI, DS AX MOVsx, ES AX MOVsx,
 SS AX MOVsx, STI,
-AH 2 MOVri, DX 0 MOVxI, CH 0 MOVri, CL 2 MOVri, AL 2 MOVri,
+AH 2 MOVri, DX 0 MOVxI, CH 0 MOVri, CL 2 MOVri, AL 3 MOVri,
-BX 0 MOVxI, 0x13 INT, ( read sectors 2-3 of boot floppy )
+BX 0 MOVxI, 0x13 INT, ( read sectors 2-4 of boot floppy )
 0x800 0 JMPf,
 ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,

blk/812

@@ -1,4 +1,4 @@
-VARIABLE lblexec VARIABLE lblfind
+VARIABLE lblexec VARIABLE lblfind VARIABLE lblnext
 H@ ORG !
 JMPn, 0 A,,   ( 00, main )     0 A, 0 A,, ( unused )
 0 A,, ( unused ) 0 A,, ( 08, LATEST )

blk/816

@@ -1,4 +1,4 @@
-PC 0x1d - ORG @ 0x1b + ! ( next )
+lblnext BSET PC 0x1d - ORG @ 0x1b + ! ( next )
     DI DX MOVxx, ( <-- IP ) DX INCx, DX INCx,
     DI [DI] MOVx[], ( wordref )
     ( continue to execute )

blk/826

@@ -1,8 +1,9 @@
-CODE 0 AX AX XORxx, AX PUSHx, ;CODE
+CODE _find ( cur w -- a f )
-CODE 1 AX 1 MOVxI, AX PUSHx, ;CODE
+    SI POPx, ( w ) DI POPx, ( cur )
-CODE 1+ DI SP MOVxx, [DI] INC[w], ;CODE
+    CALLn, lblfind @ RPCn,
-CODE 1- DI SP MOVxx, [DI] DEC[w], ;CODE
+    IFNZ, ( not found )
-CODE EMIT
+        SI PUSHx, AX AX XORxx, AX PUSHx,
-    AX POPx, AH 0x0e MOVri, ( print char ) 0x10 INT,
+        JMPn, lblnext @ RPCn,
+    THEN, ( found )
+    DI PUSHx, AX 1 MOVxI, AX PUSHx,
 ;CODE
-: BOOT 4 5 CMP '=' + EMIT ;

blk/828

@@ -0,0 +1,10 @@
+CODE 0 AX AX XORxx, AX PUSHx, ;CODE
+CODE 1 AX 1 MOVxI, AX PUSHx, ;CODE
+CODE 1+ DI SP MOVxx, [DI] INC[w], ;CODE
+CODE 1- DI SP MOVxx, [DI] DEC[w], ;CODE
+CODE EMIT
+    AX POPx, AH 0x0e MOVri, ( print char ) 0x10 INT,
+;CODE
+: FOO 'X' EMIT ;
+L1 BSET 3 A, 'F' A, 'O' A, 'O' A,
+: BOOT 0x08 @ [ L1 @ LITN ] _find DROP EXECUTE BYE ;

recipes/pcat/xcomp.fs

@@ -3,7 +3,7 @@
 750 LOAD  ( 8086 asm )
 262 LOAD  ( xcomp )
 270 LOAD  ( xcomp overrides )
-812 826 LOADR
+812 828 LOADR
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !