Self written tape stuff

boot.asm

@@ -19,6 +19,7 @@ BANK_MODE_CLEAR_MASK = 0xF9 ; preserve ROM-disable and auxiliary outputs
         .globl _bios_putc
         .globl _bios_try_getc
         .globl _bios_getc
+        .globl _bios_flush
         .globl _bios_init
         .globl _bios_bank
         .globl _bios_rom_disable
@@ -79,7 +80,7 @@ boot_copy:
 ; Stable BIOS jump table for ROM-resident applications.
 ; C050 putc(A), C053 try_getc(), C056 getc(), C059 io_out(A,L),
 ; C05C io_in(A), C05F delay_ms(HL), C062 monitor warm start,
-; C065 bank(A), C068 disable ROM, C06B enable ROM.
+; C065 bank(A), C068 disable ROM, C06B enable ROM, C06E flush output.
 .org BIOS_PUTC
         jp bios_service_putc
 .org BIOS_TRY_GETC
@@ -100,11 +101,13 @@ boot_copy:
         jp _bios_rom_disable
 .org BIOS_ROM_ENABLE
         jp _bios_rom_enable
+.org BIOS_FLUSH
+        jp bios_service_flush
 
 ; Port 00 is write-only.  Keep its last BIOS-managed value outside the C data
 ; areas so a monitor warm start does not reset it.  The bootstrap establishes
 ; this same value in the hardware before the resident image is copied.
-.org RESIDENT_RAM_BASE + 0x70
+.org RESIDENT_RAM_BASE + 0x73
 _bank_control_shadow::
         .db BOOT_BANK_MAPPING
 
@@ -258,6 +261,22 @@ bios_service_getc:
         pop     bc
         ret
 
+bios_service_flush:
+        push    af
+        push    bc
+        push    de
+        push    hl
+        push    ix
+        push    iy
+        call    _bios_flush
+        pop     iy
+        pop     ix
+        pop     hl
+        pop     de
+        pop     bc
+        pop     af
+        ret
+
 bios_service_io_out:
         push    af
         push    bc