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26 changed files with 52 additions and 89 deletions

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@ -13,4 +13,4 @@ Contents
4 Number literals 6 Compilation vs meta-comp.
8 Interpreter I/O 11 Signed-ness
14 Addressed devices 17 DOES>
18 Disk blocks

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Disk blocks
Disk blocks are Collapse OS' main access to permanent storage.
The system is exceedingly simple: blocks are contiguous
chunks of 1024 bytes each living on some permanent media such
as floppy disks or SD cards. They are mostly used for text,
either informational or source code, which is organized into
16 lines of 64 characters each.
Blocks are referred to by number, 0-indexed. They are read
through BLK@ and written through BLK!. When a block is read,
its 1024 bytes content is copied to an in-memory buffer
starting at BLK( and ending at BLK). Those read/write
operations are often implicit. For example, LIST calls BLK@.
(cont.)

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blk/019
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When a word modifies the buffer, it sets the buffer as dirty
by calling BLK!!. BLK@ checks, before it reads its buffer,
whether the current buffer is dirty and implicitly calls BLK!
when it is.
The index of the block currently in memory is kept in BLK>.
Many blocks contain code. That code can be interpreted through
LOAD. Programs stored in blocks frequently have "loader blocks"
that take care of loading all blocks relevant to the program.
Blocks spanning multipls disks are tricky. If your media isn't
large enough to hold all Collapse OS blocks in one unit, you'll
have to make it span multiple disks. Block reference in
informational texts aren't a problem: When you swap your disk,
you mentally adjust the block number you fetch. (cont.)

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However, absolute LOAD operations in Collapse OS aren't aware
of disk spanning and will not work properly in your spanned
system.
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/056
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Logic
= n1 n2 -- f Push true if n1 == n2
< n1 n2 -- f Push true if n1 < n2
> n1 n2 -- f Push true if n1 > n2
>< n l h -- f Push true if l < n < h
=><= n l h -- f Push true if l <= n <= h
CMP n1 n2 -- n Compare n1 and n2 and set n to -1, 0, or 1.
= n1 n2 -- f Push true if n1 == n2
< n1 n2 -- f Push true if n1 < n2
> n1 n2 -- f Push true if n1 > n2
CMP n1 n2 -- n Compare n1 and n2 and set n to -1, 0, or 1.
n=0: a1=a2. n=1: a1>a2. n=-1: a1<a2.
NOT f -- f Push the logical opposite of f
NOT f -- f Push the logical opposite of f

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blk/064
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Disk
BLK> -- a Address of the current block variable.
BLK( -- a Beginning addr of blk buf.
BLK) -- a Ending addr of blk buf.
COPY s d -- Copy contents of s block to d block.
FLUSH -- Write current block to disk if dirty.
LIST n -- Prints the contents of the block n on screen
in the form of 16 lines of 64 columns.
LOAD n -- Interprets Forth code from block n
LOAD+ n -- Relative load. Loads active block + n.
LOADR n1 n2 -- Load block range between n1 and n2, inclusive.
LOADR+ n1 n2 -- Relative ranged load.
WIPE -- Empties current block
BLK> -- a Address of the current block variable.
BLK( -- a Beginning addr of blk buf.
BLK) -- a Ending addr of blk buf.
COPY s d -- Copy contents of s block to d block.
FLUSH -- Write current block to disk if dirty.
LIST n -- Prints the contents of the block n on screen
in the form of 16 lines of 64 columns.
LOAD n -- Interprets Forth code from block n
LOADR n1 n2 -- Load block range between n1 and n2, inclusive.
WIPE -- Empties current block

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@ -1,8 +1,9 @@
50 LOAD+ ( B152, extras )
1 5 LOADR+
152 LOAD ( extras )
103 107 LOADR
: BROWSE
L BEGIN
100 _LIST
BEGIN
KEY CASE
'Q' OF EXIT ENDOF
'B' OF B ENDOF

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@ -1 +1 @@
1 9 LOADR+
123 131 LOADR

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@ -1 +1 @@
1 2 LOADR+
143 144 LOADR

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'? CASE NOT [IF]
1 5 LOADR+
153 157 LOADR
[THEN] DROP ( from '? )

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1 LOAD+ Z80A$
3 37 LOADR+
213 LOAD Z80A$
215 249 LOADR

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1 LOAD+ 3 LOAD+ 6 LOAD+ 7 LOAD+
263 LOAD 265 LOAD 268 LOAD 269 LOAD

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@ -1 +1 @@
1 51 LOADR+
283 333 LOADR

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@ -11,5 +11,5 @@ ACIA_MEM
+4 ACIA(
+6 ACIA) )
1 3 LOADR+
353 355 LOADR

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@ -1 +1 @@
1 3 LOADR+
358 360 LOADR

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@ -13,4 +13,4 @@
DUP 20 = UNTIL
DROP 0xff
;
1 12 LOADR+
375 386 LOADR

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@ -12,4 +12,4 @@
0 0x08 RAM+ ! ( 08 == C<* override )
LIT< INTERPRET (find) DROP EXECUTE
;
1 20 LOADR+
394 413 LOADR

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@ -7,9 +7,7 @@
: >= < NOT ;
: <= > NOT ;
: 0>= 0< NOT ;
( n l h -- f )
: >< 2 PICK > ( n l f ) ROT ROT > AND ;
: =><= 2 PICK >= ( n l f ) ROT ROT >= AND ;
( a -- a+1 c )
: C@+ DUP C@ SWAP 1+ SWAP ;
( c a -- a+1 )

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: _pdacc
DUP 0x21 < IF DROP 1 EXIT THEN
( parse char )
( if bad, return "r -1" )
'0' -
DUP 10 < NOT IF DROP -1 EXIT THEN
( if bad, return "r -1" )
DUP 0< IF DROP -1 EXIT THEN ( bad )
DUP 9 > IF DROP -1 EXIT THEN ( bad )
( good, add to running result )
SWAP 10 * + ( r*10+n )
0 ( good )

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blk/399
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( returns negative value on error )
: _ ( c -- n )
DUP '0' '9' =><= IF '0' - EXIT THEN
DUP 'a' 'f' =><= IF 0x57 ( 'a' - 10 ) - EXIT THEN
DROP -1 ( bad )
( '0' is ASCII 48 )
48 -
DUP 0< ( bad ) OVER 10 < ( good ) OR IF EXIT THEN
( 'a' is ASCII 97. 59 = 97 - 48 )
49 -
DUP 0< IF EXIT THEN ( bad )
DUP 6 < IF 10 + EXIT THEN ( good )
( bad )
255 -
;

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( returns negative value on error )
: _ ( c -- n )
DUP '0' '1' =><= IF '0' - EXIT THEN
DROP -1 ( bad )
( '0' is ASCII 48 )
48 -
DUP 0< ( bad ) OVER 2 < ( good ) OR IF EXIT THEN
( bad )
255 -
;

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@ -8,7 +8,7 @@
DROP
8 0 DO
C@+
DUP 0x20 0x7e =><= NOT
DUP 0x20 < OVER 0x7e > OR
IF DROP '.' THEN
EMIT
LOOP

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: LOAD+ BLK> @ + LOAD ;
( b1 b2 -- )
: LOADR 1+ SWAP DO I DUP . NL LOAD LOOP ;
: LOADR+ BLK> @ + SWAP BLK> @ + SWAP LOADR ;

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@ -1 +1 @@
1 5 LOADR+
493 497 LOADR

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1 2 LOADR+
499 500 LOADR

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