polish balance and messaging at beginning and end (#3)

* bootloader println

* Some keyboard interactivity

* 2 newlines

* player is smiley and game is winnable

* more balance and exit message

Justfile

@@ -33,7 +33,7 @@ build-bootloader: build-stage2
     file_size=$(wc -c < "{{stage2_out}}")
     num_sectors=$(( (file_size + SECTOR_SIZE - 1) / SECTOR_SIZE ))
 
-    nasm -f bin -DNUM_SECTORS=$num_sectors -o {{bootloader_out}} {{bootloader_in}}
+    nasm -f bin -DNUM_SECTORS=$num_sectors -DNUM_SECTORS_STR="\"$num_sectors\"" -o {{bootloader_out}} {{bootloader_in}}
 
 build-stage2:
     nasm -f bin -D BOOT -o {{stage2_out}} {{infile}} -l {{listing_out}}

bootloader.asm

@@ -7,9 +7,11 @@ start:
     mov [boot_drive], dl
 
     ; Display a message to indicate bootloader is running
-    mov si, msg
-    call print_string
+    mov si, init_msg
+    call println
 
+    mov si, loading_msg
+    call println
 
     ; Load the second sector from the disk
     ; Use the drive number in 'boot_drive'
@@ -25,16 +27,20 @@ start:
     ; Check for errors
     jc disk_error       ; If carry flag is set, there was an error
 
+    mov si, ready_msg
+    call println
+    call read_keyboard
+
     ; Jump to loaded code
     jmp 0x0000:0x0600   ; Segment:Offset where the second sector is loaded
 
 disk_error:
     ; Display error message and halt
     mov si, err_msg
-    call print_string
+    call println
     jmp $
 
-print_string:
+println:
     push ax
     push si
     mov ah, 0x0E        ; BIOS teletype function
@@ -46,13 +52,32 @@ print_char:
     inc si
     jmp print_char
 print_done:
+    ; 2 newlines
+    mov al, 0x0D
+    int 0x10
+    mov al, 0x0A
+    int 0x10
+    mov al, 0x0D
+    int 0x10
+    mov al, 0x0A
+    int 0x10
+
     pop si
     pop ax
     ret
 
+; read keylevel input into AL; trash AH
+read_keyboard:
+    mov ah,0x00 ; set AH for keylevel read
+    int 0x16 ; call interrupt to read keylevel
+
+    ret ; returns to caller
+
 boot_drive db 0         ; Storage for boot drive number
 
-msg db 'Bootloader running...', 0
+init_msg db 'Bootloader running...', 0
+ready_msg db 'Loaded program into memory. Press any key to boot.', 0
+loading_msg db 'Loading ', NUM_SECTORS_STR, ' sectors from disk...', 0
 err_msg db 'Disk load error', 0
 
 times 510-($-$$) db 0   ; Fill the rest of the 512 bytes with zeros

puzdug.asm

@@ -21,7 +21,7 @@ player_addr: equ entity_arr
 player_health_str_addr: equ (hp_str + 4)
 enemy_str_addr: equ (enemy_str + 5)
 
-player_start_hp: equ 125
+player_start_hp: equ 150
 player_atk: equ 20
 enemy_start_hp: equ 100
 enemy_atk: equ 15
@@ -47,7 +47,7 @@ screen_height: equ 25
 wall_char: equ 0x04b2 ; black bg, red fg, heavy texture ▓
 empty_char: equ 0x072e ; black bg, grey fg, .
 fog_char: equ 0x07f7 ; black bg, grey fg, almost equal ≈
-player_char: equ 0x0f40 ; black bg, white fg, @
+player_char: equ 0x0f01 ; black bg, white fg, smiley
 house_char: equ 0x0d7f ; black bg, pink fg, house symbol
 tree_char: equ 0x0206 ; black bg, green fg, spade symbol
 
@@ -428,8 +428,14 @@ do_lose_wait:
     call waiter
     loop do_lose_wait
 do_exit:
-    call scroll_cursor
+    mov bx,exit_str
+    mov dl,2
+    mov dh,20
+    mov ah, 0x0f ; white text black bg
+    call draw_text
 %ifdef DOS
+    call read_keyboard
+    call scroll_cursor
     int 0x20
 %else
     jmp $ ; infinite loop
@@ -724,6 +730,13 @@ game_over_str:
 victory_str:
     db "VICTORY ATTAINED", 0
 
+exit_str:
+%ifdef DOS
+    db "The game has ended. Press any key to exit", 0
+%else
+    db "The game has ended. You may now power off your computer", 0
+%endif
+
 scroll_cursor:
     ; scroll the screen by typing one page full of newlines in teletype
     mov cx, screen_height