z80: make boot binary a 2-part process

Previously, recipes that began spitting binary contents before
loading block 282 would end up with VARIABLE code in their binary,
thus breaking them. We fix this by making this loading process
2-part.

blk/281

@@ -9,4 +9,7 @@ esses. The rest of the Collapse OS code depend on it. In fact,
 up until 0x67, the (?br) wordref, pretty much everything has
 to stay put.
 
-To assemble, run "282 LOAD".
+The boot binary is loaded in 2 parts. The first part, "decla-
+rations", are loaded after xcomp, before xcomp overrides, with
+"282 LOAD". The rest, after xcomp overrides, with "283 335
+LOADR".

blk/282

@@ -1,3 +1,2 @@
 VARIABLE lblofl VARIABLE lblpushRS VARIABLE lblexec
 VARIABLE lblfind
-1 53 LOADR+

blk/618

@@ -5,9 +5,9 @@
 5      CONSTANT SDC_CSLOW      6      CONSTANT SDC_CSHIGH
 RAMSTART 0x70 + CONSTANT ACIA_MEM
 212 LOAD  ( z80 assembler )
-262 LOAD  ( xcomp )            270 LOAD  ( xcomp overrides )
-282 LOAD  ( boot.z80 )         353 LOAD  ( xcomp core low )
-582 LOAD  ( acia )
+262 LOAD  ( xcomp )            282 LOAD  ( boot.z80.decl )
+270 LOAD  ( xcomp overrides )  283 335 LOADR ( boot.z80 )
+353 LOAD  ( xcomp core low )   582 LOAD  ( acia )
 380 LOAD  ( xcomp core high )
 (entry) _
 ( Update LATEST )

emul/xcomp.fs

@@ -3,9 +3,9 @@
 0xfffa CONSTANT PS_ADDR
 212 LOAD  ( z80 assembler )
 262 LOAD  ( xcomp )
+282 LOAD  ( boot.z80.decl )
 270 LOAD  ( xcomp overrides )
-
-282 LOAD  ( boot.z80 )
+283 335 LOADR ( boot.z80 )
 353 LOAD  ( xcomp core low )
 : (emit) 0 PC! ;
 : (key) 0 PC@ ;

recipes/sms/xcomp.fs

@@ -15,6 +15,7 @@ RAMSTART 0x72 + CONSTANT PAD_MEM
 : ZFILL, ( u ) 0 DO 0 A, LOOP ;
 262 LOAD  ( xcomp )
 524 LOAD  ( font compiler )
+282 LOAD  ( boot.z80.decl )
 270 LOAD  ( xcomp overrides )
 
 0x100 JPnn, 0x63 ZFILL, ( 0x66 )
@@ -22,7 +23,7 @@ RETN, 0x98 ZFILL, ( 0x100 )
 ( All set, carry on! )
 CURRENT @ XCURRENT !
 0x100 BIN( !
-282 LOAD  ( boot.z80 )
+283 335 LOADR ( boot.z80 )
 353 LOAD  ( xcomp core low )
 CREATE ~FNT CPFNT7x7
 623 628 LOADR ( VDP )

recipes/ti84/xcomp.fs

@@ -8,6 +8,7 @@ RAMSTART 0x72 + CONSTANT KBD_MEM
 : ZFILL, ( u ) 0 DO 0 A, LOOP ;
 262 LOAD  ( xcomp )
 522 LOAD  ( font compiler )
+282 LOAD  ( boot.z80.decl )
 270 LOAD  ( xcomp overrides )
 
 ( TI-84+ requires specific code at specific offsets which
@@ -59,7 +60,7 @@ HALT,
 CURRENT @ XCURRENT !
 
 0x100 BIN( !
-282 LOAD  ( boot.z80 )
+283 335 LOADR ( boot.z80 )
 353 LOAD  ( xcomp core low )
 CREATE ~FNT CPFNT3x5
 555 560 LOADR ( LCD low )

recipes/trs80/xcomp.fs

@@ -1,15 +1,15 @@
 0xff00 CONSTANT RS_ADDR
 0xfffa CONSTANT PS_ADDR
 RS_ADDR 0x80 - CONSTANT RAMSTART
-212 LOAD  ( z80 assembler )
-262 LOAD  ( xcomp )
-270 LOAD  ( xcomp overrides )
-
+212 LOAD ( z80 assembler )
+262 LOAD ( xcomp )
+282 LOAD ( boot.z80.decl )
+270 LOAD ( xcomp overrides )
 0x3000 BIN( !
-282 LOAD  ( boot.z80 )
-353 LOAD  ( xcomp core low )
-492 LOAD  ( trs80 )
-380 LOAD  ( xcomp core high )
+283 335 LOADR ( boot.z80 )
+353 LOAD ( xcomp core low )
+492 LOAD ( trs80 )
+380 LOAD ( xcomp core high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !

recipes/z80mbc2/xcomp.fs

@@ -1,8 +1,11 @@
 0xff00 CONSTANT RS_ADDR        0xfffa CONSTANT PS_ADDR
 RS_ADDR 0x80 - CONSTANT RAMSTART
 212 LOAD  ( z80 assembler )
-262 LOAD  ( xcomp )            270 LOAD  ( xcomp overrides )
-282 LOAD  ( boot.z80 )         353 LOAD  ( xcomp core low )
+262 LOAD  ( xcomp )
+282 LOAD  ( boot.z80.decl )
+270 LOAD  ( xcomp overrides )
+283 335 LOADR ( boot.z80 )
+353 LOAD  ( xcomp core low )
 CODE (emit)
     A 1 LDrn, 1 OUTnA, HL POPqq, A L LDrr, 0 OUTnA,
 ;CODE