Add word A,

This would be useful, for example, to allow the assembler to write
straight to an AT28 EEPROM without going to RAM. This would be a
life saver in machines with tight RAM such as the SMS.

blk/007

@@ -4,8 +4,8 @@
 ;
 : PC H@ ORG @ - BIN( @ + ;
 ( A, spits an assembled byte, A,, spits an assembled word
-  Both increase PC. To debug, change C, to .X )
-: A, C, ; : A,, SPLITB A, A, ;
+  Both increase PC. )
+: A,, SPLITB A, A, ;
 : <<3 3 LSHIFT ;    : <<4 4 LSHIFT ;
 ( As a general rule, IX and IY are equivalent to spitting an
   extra 0xdd / 0xfd and then spit the equivalent of HL )

blk/032

@@ -3,5 +3,4 @@
     256 /MOD SWAP
 ;
 : PC H@ ORG @ - BIN( @ + ;
-: A, C, ;
 : A,, SPLITB A, A, ;

blk/051

@@ -6,5 +6,5 @@ VARIABLE L1 VARIABLE L2 VARIABLE L3 VARIABLE L4
 ( We divide by 2 because each PC represents a word. )
 : PC H@ ORG @ - 1 RSHIFT ;
 ( A, spits an assembled byte, A,, spits an assembled word
-  Both increase PC. To debug, change C, to .X )
-: A, C, ; : A,, SPLITB A, A, ;
+  Both increase PC. )
+: A,, SPLITB A, A, ;

blk/363

@@ -4,7 +4,7 @@ SYSVARS 0x0c + :** C<*
     0x08 RAM+ ( C<* override ) @
     ?DUP NOT IF C<* ELSE EXECUTE THEN ;
 : , H@ ! H@ 2+ HERE ! ;
-: C, H@ C! H@ 1+ HERE ! ;
+: C, H@ C!+ HERE ! ;
 : ,"
     BEGIN
         C< DUP 34 ( ASCII " ) = IF DROP EXIT THEN C,

blk/385

@@ -5,6 +5,7 @@
 ( Now, adev stuff )
 SYSVARS 0x3e + :** A@
 SYSVARS 0x40 + :** A!
+SYSVARS 0x42 + :** A,
 
 ( src dst u -- )
 : AMOVE

blk/390

@@ -7,7 +7,7 @@
     ['] (emit) ['] EMIT **! ['] (key) ['] KEY **!
     ['] CRLF ['] NL **!
     ['] (boot<) ['] C<* **!
-    ['] C@ ['] A@ **! ['] C! ['] A! **!
+    ['] C@ ['] A@ **! ['] C! ['] A! **! ['] C, ['] A, **!
     ( boot< always has a char waiting. 06 == C<?* )
     1 0x06 RAM+ ! INTERPRET
     RDLN$ LIT" _sys" [entry]

doc/impl.txt

@@ -125,12 +125,12 @@ Here's a list of them:
 SYSVARS   FUTURE USES          +3c       BLK(*
 +02       CURRENT              +3e       A@*
 +04       HERE                 +40       A!*
-+06       C<?                  +42       FUTURE USES
-+08       C<* override         +51       CURRENTPTR
-+0a       NLPTR                +53       (emit) override
-+0c       C<*                  +55       (key) override
-+0e       WORDBUF              +57       FUTURE USES
-+2e       BOOT C< PTR
++06       C<?                  +42       A,*
++08       C<* override         +44       FUTURE USES
++0a       NLPTR                +51       CURRENTPTR
++0c       C<*                  +53       (emit) override
++0e       WORDBUF              +55       (key) override
++2e       BOOT C< PTR          +57       FUTURE USES
 +30       IN>
 +32       IN(*                 +70       DRIVERS
 +34       BLK@*                +80       RAMEND

doc/usage.txt

@@ -84,9 +84,9 @@ need switches in regular code.
 
 # Addressed devices
 
-A@ and A! are the indirect versions of C@ and C!. They are
-aliases and initially point to C@ and C!. There is also a AMOVE
-word that is the same as MOVE but using A@ and A!.
+A@, A! and A, are the indirect versions of C@, C! and C,. They
+are switch words and initially point to C@, C! and C,. There is
+also a AMOVE word that is the same as MOVE but using A@ and A!.
 
 Addressed device words can be useful to "pipe" processing to
 places outside of regular memory.