VE: add 't'

This is the first commit I do entirely in VE. It's a habit I'm planning
on taking as it helps a lot to find usability issues.

blk/001

@@ -13,3 +13,4 @@ MASTER INDEX
 
 
 
+

blk/004

@@ -1,2 +1,16 @@
 21 How blocks are organized    22 Addressed devices
 23 Branching
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blk/005

@@ -10,3 +10,7 @@ binary (example "0b1010"), char literals are single characters
 surrounded by ' (example 'X'). Char literals can't be used for
 whitespaces.
 
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+

blk/006

@@ -12,3 +12,5 @@ writes that number as a literal, followed by a reference to
 Example: ": foo [COMPILE] bar;" is the equivalent of ": foo bar
 ;" if bar is not an immediate. However, ": foo COMPILE bar ;"
 is the equivalent of ": foo ['] bar , ;". Got it?
+
+

blk/009

@@ -4,3 +4,13 @@ prompt control to a RS-232 device instead of the keyboard.
 Interpreter output is unbuffered and only has EMIT. This
 word can also be overriden, mostly as a companion to the
 raison d'etre of your KEY override.
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blk/020

@@ -6,3 +6,11 @@ Although the usage of absolute LOAD calls are minimally used
 (relative LOADs are preferred), they are sometimes unavoidable.
 When you span Collapse OS over multiple disks, don't forget to
 adjust those absolute LOADs.
+
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blk/021

@@ -11,3 +11,6 @@ try to strive towards a few goals:
 4. B200-B500 are for bootstrapping
 5. The rest is for recipes.
 6. I'm not sure yet how I'll organize multiple arches.
+
+
+

blk/022

@@ -4,3 +4,13 @@ A@ and A! are the indirect versions of C@ and C!. Their target
 word is controlled through A@* and A!* and by default point to
 C@ and C*. There is also a AMOVE word that is the same as MOVE
 but using A@ and A!.
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blk/023

@@ -9,3 +9,8 @@ The reasoning behind this intentional limit is that huge
 branches are generally a indicator that a logic ought to be
 simplified. So here's one more constraint for you to help you
 towards simplicity.
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blk/032

@@ -13,3 +13,4 @@ to be used directly, but as part of another word.
 
 
 
+

blk/044

@@ -3,3 +3,14 @@ INTERPRET --   Get a line from stdin, compile it in tmp memory,
                then execute the compiled contents.
 LEAVE     --   In a DO..LOOP, exit at the next LOOP call.
 QUIT      --   Return to interpreter prompt immediately
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blk/047

@@ -6,3 +6,11 @@ ROLL        Rotate PSP over n items. "1 ROLL" = SWAP,
             "2 ROLL" = ROT. 0 is noop.
 
 
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blk/051

@@ -8,3 +8,9 @@ MOVE     a1 a2 u --      Copy u bytes from a1 to a2, starting
 MOVE-    a1 a2 u --      Copy u bytes from a1 to a2, starting
                          with a1+u, going down.
 MOVE,    a u --          Copy u bytes from a to HERE.
+
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blk/058

@@ -10,3 +10,7 @@ S=     a1 a2 -- f Returns whether string a1 == a2.
 
 
 
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blk/076

@@ -4,3 +4,13 @@ prohibitive in terms of costs), PS_ADDR should be set to
 at least 6 bytes before its actual limit. 6 bytes because we
 seldom have words requiring more than 3 items from the stack.
 Then, at each "exit" call we check for stack underflow.
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blk/084

@@ -13,3 +13,4 @@ FUTURE USES section is unused for now.
 
 DRIVERS section is reserved for recipe-specific drivers.
 
+

blk/090

@@ -8,3 +8,9 @@
 In RAM-only environment, we will typically have a
 "CURRENT @ HERE !" line during init to have HERE begin at the
 end of the binary instead of RAMEND.
+
+
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+
+

blk/102

@@ -1,2 +1,16 @@
 X ( n -- ): Delete X chars after cursor and place in IBUF.
 E: Run X with n = length of FBUF.
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blk/105

@@ -12,3 +12,5 @@
         ENDCASE
     AGAIN
 ;
+
+

blk/107

@@ -11,3 +11,6 @@ CREATE FBUF 64 ALLOT0
         EMIT
     LOOP ( lno ) 1+ . ;
 : _zbuf 64 0 FILL ; ( buf -- )
+
+
+

blk/108

@@ -10,3 +10,7 @@
 : _mvln- ( ln -- move ln 1 line up )
     DUP 14 > IF DROP 15 _lpos _zbuf
     ELSE 1+ _lpos DUP 64 - 64 MOVE THEN ;
+
+
+
+

blk/109

@@ -3,3 +3,14 @@
         14 I - _mvln+
     LOOP ;
 : U _U P ;
+
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+

blk/110

@@ -8,3 +8,9 @@
     UNTIL ( a1 a2 )
     DUP BLK) < IF BLK( - FBUF + -^ EDPOS ! ELSE DROP THEN ;
 : F FBUF _type _F EDPOS @ 64 / _pln ;
+
+
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+

blk/111

@@ -11,3 +11,6 @@
     ELSE DROP 1+ ( ilen becomes rbuffsize+1 ) THEN
     DUP IBUF EDPOS @ _cpos ROT MOVE ( ilen ) EDPOS +! BLK!! ;
 : I IBUF _type _I EDPOS @ 64 / _pln ;
+
+
+

blk/112

@@ -9,3 +9,8 @@
     EDPOS @ 64 / _pln ;
 : E FBUF _blen X ;
 : Y FBUF _blen icpy ;
+
+
+
+
+

blk/121

@@ -11,6 +11,6 @@ effect.
 block. Any change made to the previously selected block is
 saved beforehand.
 
-'[' and ']' advances the selected block by "modifier".
-
+'[' and ']' advances the selected block by "modifier". 't' opens
+the previously opened block. 
                                                         (cont.)

blk/123

@@ -8,3 +8,9 @@ be sure, then press 'E'.
 'R' goes into replace mode at current cursor position.
 Following keystrokes replace current character and advance
 cursor. Press return to return to normal mode.
+
+
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+

blk/125

@@ -1,3 +1,16 @@
 '? UPPER NOT [IF] 33 LOAD+ [THEN] DROP ( B158 )
 -20 LOAD+ ( B105, block editor )
 1 6 LOADR+
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blk/126

@@ -1,5 +1,5 @@
 CREATE CMD 2 C, '$' C, 0 C,
-VARIABLE PREVPOS
+CREATE PREVPOS 0 , CREATE PREVBLK 0 ,
 : acc@ ACC @ 1 MAX ;
 : num ACC @ SWAP _pdacc IF DROP ELSE ACC ! THEN ;
 : nspcs ( n -- , spit n space ) 0 DO SPC LOOP ;
@@ -9,5 +9,8 @@ VARIABLE PREVPOS
 : status 0 aty ." BLK" SPC BLK> ? SPC ACC ?
     SPC EDPOS @ 64 /MOD . ',' EMIT . 10 nspcs ;
 : contents 3 aty BLK> @ LIST 3 16 gutter ;
-: selblk BLK@ contents ;
+: selblk BLK> @ PREVBLK ! BLK@ contents ;
 : mode! ( c -- ) 63 0 AT-XY ;
+
+
+

blk/127

@@ -8,3 +8,9 @@
     ( buf ln c ) 63 nspcs SWAP 4 SWAP AT-XY ( buf c )
     SWAP DUP _zbuf C!+ DUP 63 + SWAP DO
         C< DUP 0x0d = IF LEAVE THEN i C! LOOP ;
+
+
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blk/128

@@ -1,6 +1,7 @@
 : $g ACC @ selblk ;
 : $[ BLK> @ acc@ - selblk ;
 : $] BLK> @ acc@ + selblk ;
+: $t PREVBLK @ selblk ;   
 : $I mode! 'I' EMIT IBUF 1 buftype _I contents mode! SPC ;
 : $F mode! 'F' EMIT FBUF 2 buftype _F setpos mode! SPC ;
 : $Y Y ;
@@ -10,3 +11,6 @@
 : $H EDPOS @ 0x3c0 AND pos! ;
 : $L EDPOS @ 0x3f OR pos! ;
 
+
+
+

blk/129

@@ -10,3 +10,7 @@
 : $B EDPOS @ BLK( + acc@ 0 DO
     BEGIN C@- WS? UNTIL BEGIN C@- WS? NOT UNTIL LOOP
     1+ BLK( - pos! ;
+
+
+
+

blk/130

@@ -13,3 +13,4 @@
 : $D $H 64 icpy
     acc@ 0 DO 16 EDPOS @ 64 / DO i _mvln- LOOP LOOP
     BLK!! contents ;
+

blk/131

@@ -12,3 +12,5 @@
     clrscr 0 ACC ! 0 PREVPOS ! contents
     BEGIN status bufs setpos KEY handle UNTIL
     0 0x08 RAM+ ! 19 aty ;
+
+

blk/150

@@ -13,3 +13,4 @@ Some programs need them, so they will automatically LOAD them.
 Because more than one program can use the same extra words,
 conditional loaders are recommended. If you want to load all
 words do "152 LOAD" which conditionally loads all extra words.
+

blk/152

@@ -2,3 +2,15 @@
 '? FILL NOT [IF] 3 LOAD+ [THEN] DROP
 '? EMPTY NOT [IF] 4 LOAD+ [THEN] DROP
 '? WIPE NOT [IF] 5 LOAD+ [THEN] DROP
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blk/153

@@ -9,3 +9,8 @@
 : ENDOF [COMPILE] ELSE ; IMMEDIATE
 
 
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blk/154

@@ -9,3 +9,8 @@
 ; IMMEDIATE
 
 
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blk/155

@@ -3,3 +3,14 @@
         DUP I C!
     LOOP DROP ;
 : ALLOT0 ( n -- ) H@ OVER 0 FILL ALLOT ;
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blk/156

@@ -2,3 +2,15 @@
     LIT< _sys FIND NOT IF ABORT THEN
     DUP HERE ! CURRENT ! ;
 
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blk/157

@@ -3,3 +3,14 @@
 ( src dst -- )
 : COPY SWAP BLK@ BLK> ! BLK! ;
 
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blk/158

@@ -1,2 +1,16 @@
 : LOWER DUP 'A' 'Z' =><= IF 32 + THEN ;
 : UPPER DUP 'a' 'z' =><= IF 32 - THEN ;
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blk/200

@@ -11,3 +11,6 @@ Z80 Assembler
 238 OP3ddnn                    240 OP3nn
 242 Specials                   246 Flow
 249 Macros
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blk/206

@@ -1,3 +1,16 @@
 On top of that, you have the very nice BREAK, instruction,
 which must also be preceeded by a JRxx, and will jump to the
 PC following the next AGAIN,
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blk/209

@@ -9,3 +9,8 @@ JR [, Z, NZ, C, NC]
 
 DI         EI          EXDEHL      EXX         HALT
 NOP        RET         RETI        RETN        SCF
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blk/212

@@ -1 +1,16 @@
 1 37 LOADR+
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blk/213

@@ -6,3 +6,11 @@ VARIABLE L1 VARIABLE L2 VARIABLE L3 VARIABLE L4
 : BC 0 ; : DE 1 ; : HL 2 ; : AF 3 ; : SP AF ;
 : CNZ 0 ; : CZ 1 ; : CNC 2 ; : CC 3 ;
 : CPO 4 ; : CPE 5 ; : CP 6 ; : CM 7 ;
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blk/216

@@ -10,3 +10,7 @@
 0x1f OP1 RRA,                  0x0f OP1 RRCA,
 0x37 OP1 SCF,
 
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blk/217

@@ -9,3 +9,8 @@
 0x28 OP1 JRZ,                  0x20 OP1 JRNZ,
 
 
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blk/218

@@ -10,3 +10,7 @@
 0x04 OP1r INCr,                0x05 OP1r DECr,
 : INC(IXY+), INCr, A, ;
 : DEC(IXY+), DECr, A, ;
+
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blk/219

@@ -12,3 +12,5 @@
 0xb0 OP1r0 ORr,                0x90 OP1r0 SUBr,
 0x98 OP1r0 SBCr,               0xa8 OP1r0 XORr,
 : CP(IXY+), CPr, A, ;
+
+

blk/220

@@ -13,3 +13,4 @@
 
 : ADDIXss, 0xdd A, ADDHLss, ;  : ADDIXIX, HL ADDIXss, ;
 : ADDIYss, 0xfd A, ADDHLss, ;  : ADDIYIY, HL ADDIYss, ;
+

blk/222

@@ -12,3 +12,5 @@
     _1rr
 ;
 0x40 OP1rr LDrr,
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+

blk/223

@@ -11,3 +11,6 @@
     SWAP            ( ixy+- rd HL )
     LDIXYr,
 ;
+
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blk/224

@@ -7,3 +7,10 @@
 0xeda8 OP2 LDD,                0xedb8 OP2 LDDR,
 0xed44 OP2 NEG,
 0xed4d OP2 RETI,               0xed45 OP2 RETN,
+
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blk/226

@@ -13,3 +13,4 @@
 0xee OP2n XORn,
 0xfe OP2n CPn,
 
+

blk/228

@@ -9,3 +9,8 @@
 ;
 0x06 OP2rn LDrn,
 
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blk/230

@@ -12,3 +12,5 @@
 0x80 OP2br RESbr,
 0x40 OP2br BITbr,
 
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blk/234

@@ -12,3 +12,5 @@
 0xed41 OP2r OUT(C)r,
 0xed40 OP2r INr(C),
 
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blk/236

@@ -10,3 +10,7 @@
 0x4a OP2ss ADCHLss,
 0x42 OP2ss SBCHLss,
 
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blk/238

@@ -9,3 +9,8 @@
     A,,
 ;
 0x01 OP3ddnn LDddnn,
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blk/240

@@ -9,3 +9,8 @@
 0xc3 OP3nn JPnn,
 0x22 OP3nn LD(nn)HL,
 0x2a OP3nn LDHL(nn),
+
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blk/242

@@ -12,3 +12,5 @@
 
 : JP(IX), IX DROP JP(HL), ;
 : JP(IY), IY DROP JP(HL), ;
+
+

blk/243

@@ -13,3 +13,4 @@
 ;
 : ;CODE JPNEXT, ;
 
+

blk/247

@@ -6,3 +6,11 @@
     THEN ;
 : AGAIN, BREAK?, PC - 1- A, ;
 : BWR @ AGAIN, ;
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blk/249

@@ -10,3 +10,7 @@
 : LDDE(HL), E (HL) LDrr, HL INCss, D (HL) LDrr, ;
 : OUTHL, DUP A H LDrr, OUTnA, A L LDrr, OUTnA, ;
 : OUTDE, DUP A D LDrr, OUTnA, A E LDrr, OUTnA, ;
+
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blk/261

@@ -7,3 +7,10 @@ See example in /emul/xcomp.fs
 
 Why limit ourselves to icore? Oh, I've tried cross-compiling
 the whole shebang. I tried. And failed. Too dynamic.
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blk/262

@@ -1 +1,16 @@
 1 LOAD+ 3 LOAD+ 6 LOAD+ 
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blk/263

@@ -13,3 +13,4 @@ VARIABLE XCURRENT
     XCON ' _xapply LITA
     LIT< , FIND DROP _xapply , XCOFF ;
 : X[COMPILE] XCON ' _xapply , XCOFF ;
+

blk/264

@@ -12,3 +12,5 @@ never supposed to encounter an immediate at this point.
 If not found, we try the same word on system dict (RAM+02).
 If found and is immediate, execute. If founf and not immediate,
 error. If not found, try number.
+
+

blk/265

@@ -12,3 +12,5 @@
     THEN
     AGAIN
 ;
+
+

blk/270

@@ -9,3 +9,8 @@
 
 CURRENT @ XCURRENT !
 
+
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+

blk/281

@@ -10,3 +10,7 @@ up until 0x67, the (?br) wordref, pretty much everything has
 to stay put.
 
 To assemble, run "282 LOAD".
+
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blk/282

@@ -1 +1,16 @@
 1 53 LOADR+
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blk/283

@@ -13,3 +13,4 @@ NOP, NOP,     ( 24, addrWord ) NOP, NOP,     ( 26, unused )
 0 JPnn,       ( RST 30 )
 0 JPnn,       ( 33, execute )  NOP, NOP,     ( unused )
 0 JPnn,       ( RST 38 )
+

blk/285

@@ -13,3 +13,4 @@ CODE (loop) ( 0x77 )
     A 1 IX+ LDrIXY, 1 IX- CP(IXY+), JRNZ, L2 BWR ( branch )
     ( don't branch )
     IX DECss, IX DECss, IX DECss, IX DECss, JR, L1 BWR
+

blk/287

@@ -12,3 +12,5 @@ PC ORG @ 0x24 + ! ( addrWord )
     IY INCss,
     DE PUSHqq,
     JPNEXT,
+
+

blk/288

@@ -8,3 +8,9 @@ PC ORG @ 0x22 + ! ( litWord, 0xf7, tight on the 0x100 limit )
     DE ADDIYss,
     HL PUSHqq,
     JPNEXT,
+
+
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+

blk/289

@@ -13,3 +13,4 @@ PC ORG @ 1 + ! ( main )
   Forth. )
     BIN( @ 0x08 + LDHL(nn),
     RAMSTART 0x02 + LD(nn)HL, ( RAM+02 == CURRENT       cont. )
+

blk/290

@@ -2,3 +2,15 @@
     HL L1 @ LDddnn,
     0x03 BCALL, ( 03 == find )
     0x33 BJP,   ( 33 == execute )
+
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blk/291

@@ -13,3 +13,4 @@ PC ORG @ 4 + ! ( find )
     C A LDrr, B 0 LDrn, ( C holds our length )
     BC ADDHLss, HL INCss, ( HL points to after-last-char )
                                                      ( cont . )
+

blk/292

@@ -6,3 +6,11 @@
         LDA(DE),
         0x7f ANDn,          ( remove IMMEDIATE flag )
         C CPr,                                        ( cont. )
+
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+

blk/293

@@ -13,3 +13,4 @@
             DJNZ, AGAIN,
         THEN,
                                                       ( cont. )
+

blk/296

@@ -4,3 +4,13 @@
     L2 FSET ( end )
     HL POPqq,
     RET,
+
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blk/297

@@ -11,3 +11,6 @@ PC ORG @ 0x15 + ! ( popRS )
     IX DECss,
     IX DECss,
     RET,
+
+
+

blk/298

@@ -5,3 +5,12 @@ L2 BSET ( abortUnderflow )
     0x03 BCALL, ( find )
     0x33 BJP,   ( 33 == execute )
 
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blk/299

@@ -11,3 +11,6 @@ PC ORG @ 0x1e + ! ( chkPS )
     CNC RETcc,      ( PS_ADDR >= SP? good )
     JR, L2 BWR      ( abortUnderflow-B298 )
 
+
+
+

blk/301

@@ -13,3 +13,4 @@ L3 BSET PC ORG @ 0x34 + ! ( execute )
     ( DE points to PFA )
     JP(HL),
 
+

blk/302

@@ -10,3 +10,7 @@ L1 BSET PC ORG @ 0x0f + ! ( compiledWord )
     HL INCss,
     HL PUSHqq, IY POPqq, ( --> IP )
     JR, L3 BWR      ( execute-B301 )
+
+
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+

blk/303

@@ -3,3 +3,14 @@ PC ORG @ 0x0c + ! ( cellWord )
     DE PUSHqq,
     JPNEXT,
 
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blk/305

@@ -7,3 +7,10 @@ CODE EXECUTE
     DE POPqq,
     chkPS,
     JR, L3 BWR      ( execute-B301 )
+
+
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+

blk/306

@@ -9,3 +9,8 @@ CODE ROT
     BC PUSHqq,      ( A )
 ;CODE
 
+
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+

blk/308

@@ -8,3 +8,9 @@ CODE SWAP
 ;CODE
 
 
+
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+

blk/309

@@ -9,3 +9,8 @@ CODE OVER
 ;CODE
 
 
+
+
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+

blk/310

@@ -13,3 +13,4 @@ CODE PICK
     CC L2 @ JPccnn,    ( abortUnderflow-B298 )
     BC PUSHqq,
 ;CODE
+

blk/311

@@ -13,3 +13,4 @@ CODE (roll)
     HL DECss,
     LDDR,
 ;CODE
+

blk/312

@@ -12,3 +12,5 @@ CODE 2DUP
     DE PUSHqq, HL PUSHqq,
 ;CODE
 
+
+

blk/313

@@ -9,3 +9,8 @@ CODE 'S
     HL PUSHqq,
 ;CODE
 
+
+
+
+
+

blk/314

@@ -12,3 +12,5 @@ CODE AND
 ;CODE
 
 
+
+

blk/315

@@ -10,3 +10,7 @@ CODE OR
     H A LDrr,
     HL PUSHqq,
 ;CODE
+
+
+
+