move most of Launch code to LC RAM bank 2

src/constants.a

@@ -9,7 +9,7 @@
 ; D000..E5F4 - persistent data structures (per-game cheat categories,
 ;              gGlobalPrefsStore, gGamesListStore)
 ; ...unused...
-; EC89..FFF9 - main program code
+; ECBA..FFF9 - main program code
 ; FFFA..FFFF - NMI, reset, IRQ vectors
 ;
 ; LC RAM BANK 2

src/glue.launch.a

@@ -9,6 +9,9 @@
 ; - PlayGame
 ; - Launch
 ;
+; Public variables:
+; - gGameToLaunch - 0-based index into gGamesListStore
+;
 
 GetGameDisplayName
 ; in:    A/Y points to game filename
@@ -146,25 +149,4 @@ gGameToLaunch=*+1
          ; execution falls through here
 Launch
          jsr   SwitchToBank2
-         jsr   SaveOrRestoreScreenHoles ; save screen hole contents
-         ldy   #$F1
--        lda   $100,y
-         sta   $DF00,y               ; back up stack
-         iny
-         bne   -
-         tsx                         ; back up stack pointer
-         stx   $DFF0
-         lda   #$38                  ; 'sec' opcode to tell |Reenter| to
-         sta   RestoreStackNextTime  ; restore the stack and stack pointer
-
-         ldx   #(end_promote-promote-1)
--        lda   promote,x             ; copy ProDOS shim to main memory
-         sta   $bf00,x
-         dex
-         bpl   -
-         tya
-         ldy   #$18
--        sta   $bf57,y
-         dey
-         bne   -
-         jmp   $106                  ; jump to pre-launch code
+         jmp   LaunchInternal

src/prodos.impl.a

@@ -630,3 +630,27 @@ SaveSmallFileInternal
          sta   reqcmd
          sta   sizelo                ; non-zero
          jmp   hddopendir            ; exit via ProRWTS2 (must re-open the file after query)
+
+LaunchInternal
+         jsr   SaveOrRestoreScreenHoles ; save screen hole contents
+         ldy   #$F1
+-        lda   $100,y
+         sta   $DF00,y               ; back up stack
+         iny
+         bne   -
+         tsx                         ; back up stack pointer
+         stx   $DFF0
+         lda   #$38                  ; 'sec' opcode to tell |Reenter| to
+         sta   RestoreStackNextTime  ; restore the stack and stack pointer
+
+         ldx   #(end_promote-promote-1)
+-        lda   promote,x             ; copy ProDOS shim to main memory
+         sta   $bf00,x
+         dex
+         bpl   -
+         tya
+         ldy   #$18
+-        sta   $bf57,y
+         dey
+         bne   -
+         jmp   $106                  ; jump to pre-launch code