Merge pull request #233 from acwright/master

Adopt optimizations

Author: willisblackburn

ac6502/ac6502.cfg

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+# SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 #
 # SPDX-License-Identifier: MIT
 #

ac6502/ac6502.inc

@@ -1,4 +1,4 @@
-; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 ;
 ; SPDX-License-Identifier: MIT
 ;

ac6502/ac6502_extension.s

@@ -1,4 +1,4 @@
-; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 ;
 ; SPDX-License-Identifier: MIT
 ;
@@ -48,16 +48,10 @@ ex_statement_name_table:
 
 ; Helper PVM fragments for 3- and 4-argument statements.
 
-ex_pvm_arg_3:
-        CALL pvm_expression
-        ARGSEP
-        CALL pvm_expression
-        ARGSEP
-        JUMP pvm_expression
-
 ex_pvm_arg_4:
         CALL pvm_expression
         ARGSEP
+ex_pvm_arg_3:
         CALL pvm_expression
         ARGSEP
         CALL pvm_expression

ac6502/ac6502_init.s

@@ -1,12 +1,11 @@
-; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 ;
 ; SPDX-License-Identifier: MIT
 ;
-; ac6502 BASIC workspace (buffers and interpreter stacks) and the
-; target-specific one-time initialization hook.  All mutable storage is
-; placed in the BSS segment so __BSS_SIZE__ correctly reflects how much
-; RAM is consumed before the user program area.  BASIC's program_ptr is
-; computed from __BSS_RUN__ + __BSS_SIZE__ (see program.s).
+; ac6502 BASIC workspace (buffers and interpreter stacks).  All mutable
+; storage is placed in the BSS segment so __BSS_SIZE__ correctly reflects
+; how much RAM is consumed before the user program area.  BASIC's
+; program_ptr is computed from __BSS_RUN__ + __BSS_SIZE__ (see program.s).
 ; 
 ; See https://github.com/acwright/6502 for more info
 
@@ -26,14 +25,4 @@ line_buffer:    .res BUFFER_SIZE
 stack:          .res PRIMARY_STACK_SIZE
 op_stack:       .res OP_STACK_SIZE
 
-.segment "ONCE"
-
-; initialize_target is invoked from the cartridge startup after BIOS
-; hardware has been initialized and interrupts have been enabled.  All
-; we need to do here is display the BASIC banner; I/O goes through the
-; BIOS via Chrout / Chrin.
-
-initialize_target:
-        jmp     display_startup_banner
-
 .code

ac6502/ac6502_io.s

@@ -1,4 +1,4 @@
-; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 ;
 ; SPDX-License-Identifier: MIT
 

ac6502/ac6502_startup.s

@@ -1,4 +1,4 @@
-; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn
+; SPDX-FileCopyrightText: 2022-2026 Willis Blackburn / 2026 A.C. Wright
 ;
 ; SPDX-License-Identifier: MIT
 ;
@@ -23,7 +23,7 @@ startup:
                                         ; Leaves interrupts disabled; caller must CLI.
         jsr     Beep                    ; Play the startup beep
         cli                             ; Enable interrupts (keyboard, serial RX)
-        jsr     initialize_target       ; BASIC-side target init (banner, etc.)
+        jsr     display_startup_banner  ; Display the BASIC banner
         jmp     main                    ; Enter the BASIC REPL (never returns)
 
 ; IRQ / NMI trampolines -- dispatch through the RAM vectors that