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2
blk/003
2
blk/003
@ -13,4 +13,4 @@ Contents
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4 Number literals 6 Compilation vs meta-comp.
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8 Interpreter I/O 11 Signed-ness
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14 Addressed devices 17 DOES>
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18 Disk blocks
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16
blk/018
Normal file
16
blk/018
Normal file
@ -0,0 +1,16 @@
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Disk blocks
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Disk blocks are Collapse OS' main access to permanent storage.
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The system is exceedingly simple: blocks are contiguous
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chunks of 1024 bytes each living on some permanent media such
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as floppy disks or SD cards. They are mostly used for text,
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either informational or source code, which is organized into
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16 lines of 64 characters each.
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Blocks are referred to by number, 0-indexed. They are read
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through BLK@ and written through BLK!. When a block is read,
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its 1024 bytes content is copied to an in-memory buffer
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starting at BLK( and ending at BLK). Those read/write
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operations are often implicit. For example, LIST calls BLK@.
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(cont.)
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16
blk/019
Normal file
16
blk/019
Normal file
@ -0,0 +1,16 @@
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When a word modifies the buffer, it sets the buffer as dirty
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by calling BLK!!. BLK@ checks, before it reads its buffer,
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whether the current buffer is dirty and implicitly calls BLK!
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when it is.
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The index of the block currently in memory is kept in BLK>.
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Many blocks contain code. That code can be interpreted through
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LOAD. Programs stored in blocks frequently have "loader blocks"
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that take care of loading all blocks relevant to the program.
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Blocks spanning multipls disks are tricky. If your media isn't
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large enough to hold all Collapse OS blocks in one unit, you'll
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have to make it span multiple disks. Block reference in
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informational texts aren't a problem: When you swap your disk,
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you mentally adjust the block number you fetch. (cont.)
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8
blk/020
Normal file
8
blk/020
Normal file
@ -0,0 +1,8 @@
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However, absolute LOAD operations in Collapse OS aren't aware
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of disk spanning and will not work properly in your spanned
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system.
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Although the usage of absolute LOAD calls are minimally used
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(relative LOADs are preferred), they are sometimes unavoidable.
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When you span Collapse OS over multiple disks, don't forget to
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adjust those absolute LOADs.
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2
blk/056
2
blk/056
@ -3,6 +3,8 @@ Logic
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= n1 n2 -- f Push true if n1 == n2
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< n1 n2 -- f Push true if n1 < n2
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> n1 n2 -- f Push true if n1 > n2
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>< n l h -- f Push true if l < n < h
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=><= n l h -- f Push true if l <= n <= h
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CMP n1 n2 -- n Compare n1 and n2 and set n to -1, 0, or 1.
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n=0: a1=a2. n=1: a1>a2. n=-1: a1<a2.
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NOT f -- f Push the logical opposite of f
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2
blk/064
2
blk/064
@ -8,7 +8,9 @@ FLUSH -- Write current block to disk if dirty.
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LIST n -- Prints the contents of the block n on screen
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in the form of 16 lines of 64 columns.
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LOAD n -- Interprets Forth code from block n
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LOAD+ n -- Relative load. Loads active block + n.
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LOADR n1 n2 -- Load block range between n1 and n2, inclusive.
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LOADR+ n1 n2 -- Relative ranged load.
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WIPE -- Empties current block
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7
blk/102
7
blk/102
@ -1,9 +1,8 @@
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152 LOAD ( extras )
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103 107 LOADR
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50 LOAD+ ( B152, extras )
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1 5 LOADR+
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: BROWSE
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100 _LIST
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BEGIN
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L BEGIN
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KEY CASE
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'Q' OF EXIT ENDOF
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'B' OF B ENDOF
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2
blk/152
2
blk/152
@ -1,3 +1,3 @@
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'? CASE NOT [IF]
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153 157 LOADR
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1 5 LOADR+
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[THEN] DROP ( from '? )
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2
blk/393
2
blk/393
@ -12,4 +12,4 @@
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0 0x08 RAM+ ! ( 08 == C<* override )
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LIT< INTERPRET (find) DROP EXECUTE
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;
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394 413 LOADR
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1 20 LOADR+
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4
blk/394
4
blk/394
@ -7,7 +7,9 @@
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: >= < NOT ;
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: <= > NOT ;
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: 0>= 0< NOT ;
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( n l h -- f )
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: >< 2 PICK > ( n l f ) ROT ROT > AND ;
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: =><= 2 PICK >= ( n l f ) ROT ROT >= AND ;
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( a -- a+1 c )
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: C@+ DUP C@ SWAP 1+ SWAP ;
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( c a -- a+1 )
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5
blk/395
5
blk/395
@ -5,10 +5,9 @@
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: _pdacc
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DUP 0x21 < IF DROP 1 EXIT THEN
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( parse char )
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'0' -
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( if bad, return "r -1" )
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DUP 0< IF DROP -1 EXIT THEN ( bad )
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DUP 9 > IF DROP -1 EXIT THEN ( bad )
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'0' -
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DUP 10 < NOT IF DROP -1 EXIT THEN
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( good, add to running result )
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SWAP 10 * + ( r*10+n )
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0 ( good )
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12
blk/399
12
blk/399
@ -1,14 +1,8 @@
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( returns negative value on error )
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: _ ( c -- n )
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( '0' is ASCII 48 )
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48 -
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DUP 0< ( bad ) OVER 10 < ( good ) OR IF EXIT THEN
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( 'a' is ASCII 97. 59 = 97 - 48 )
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49 -
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DUP 0< IF EXIT THEN ( bad )
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DUP 6 < IF 10 + EXIT THEN ( good )
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( bad )
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255 -
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DUP '0' '9' =><= IF '0' - EXIT THEN
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DUP 'a' 'f' =><= IF 0x57 ( 'a' - 10 ) - EXIT THEN
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DROP -1 ( bad )
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;
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7
blk/401
7
blk/401
@ -1,10 +1,7 @@
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( returns negative value on error )
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: _ ( c -- n )
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( '0' is ASCII 48 )
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48 -
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DUP 0< ( bad ) OVER 2 < ( good ) OR IF EXIT THEN
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( bad )
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255 -
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DUP '0' '1' =><= IF '0' - EXIT THEN
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DROP -1 ( bad )
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;
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2
blk/444
2
blk/444
@ -8,7 +8,7 @@
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DROP
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8 0 DO
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C@+
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DUP 0x20 < OVER 0x7e > OR
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DUP 0x20 0x7e =><= NOT
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IF DROP '.' THEN
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EMIT
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LOOP
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2
blk/459
2
blk/459
@ -1,2 +1,4 @@
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: LOAD+ BLK> @ + LOAD ;
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( b1 b2 -- )
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: LOADR 1+ SWAP DO I DUP . NL LOAD LOOP ;
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: LOADR+ BLK> @ + SWAP BLK> @ + SWAP LOADR ;
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BIN
emul/forth.bin
BIN
emul/forth.bin
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