Small fixes

apps/basic/basic.asm

@@ -4577,6 +4577,8 @@ FULLCPY:
 
         LD      HL,0100H        ; Program and variables start here
         LD      (BASTXT),HL
+        DEC     HL              ; RUN starts one byte before the program
+        LD      (HL),A          ; Install its zero end-of-line sentinel
 
         LD      HL,FULLMSG      ; Announce the alternate layout
         CALL    PRS
@@ -4743,6 +4745,8 @@ CLPRINTHEADER:
         call    PRS
         pop     hl
         call    PRS
+        ld      hl,CLCLRF       ; keep block progress off the filename line
+        call    PRS
         pop     de
         pop     bc
         ret
@@ -4796,9 +4800,9 @@ CLREADBLOCK:
         push    hl              ; preserve the first copy
         ld      a,'.'           ; block read correctly
         call    OUTC
-        ld      a,'o'           ; skip redundant copy
-        call    OUTC
         call    BIOS_CAS_READ_BLOCK_DRY
+        ld      a,'o'           ; redundant copy has been skipped
+        call    OUTC
         jr      2$
 3$:     ld      a,'x'           ; block failed, try redundant block
         call    OUTC
@@ -4911,7 +4915,16 @@ CSAVEB: inc     hl              ; skip #
         pop     de              ; start address
         push    hl
         ld      a,TAPE_TYPE_BINARY
-CSOUT:  call    CSWRITEHEADER   ; bc = block count, preserves de
+CSOUT:  push    af              ; preserve the header type
+        push    bc              ; preserve the exact file length
+        push    de              ; preserve the data source address
+        ld      hl,CSSTARTMSG   ; ask the user to start recording
+        call    PRS             ; print the prompt
+        call    BIOS_GETC       ; wait until the user is ready
+        pop     de              ; restore the data source address
+        pop     bc              ; restore the exact file length
+        pop     af              ; restore the header type
+        call    CSWRITEHEADER   ; bc = block count, preserves de
         call    CSWRITEBLOCKS
         ld      hl,CLCLRF
         call    PRS
@@ -4920,6 +4933,8 @@ CSOUT:  call    CSWRITEHEADER   ; bc = block count, preserves de
         pop     bc
         ret
 
+CSSTARTMSG:     .db "Record tape, then press a key...",0ah,0dh,00h
+
 ; -------------------------------------------------------
 ; Build and write a header and its redundant copy
 ; needs bc (file length in bytes)