Game Boy ROM which displays sprites in emulators but not on real hardware

header.inc

ROM_HEADER:   MACRO
 NINTENDO_LOGO

 DB 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0  ; Cart name - 15bytes
 DB 0                         ; $143
 DB 0,0                       ; $144 - Licensee code (not important)
 DB 0                         ; $146 - SGB Support indicator
 DB \1                        ; $147 - Cart type
 DB \2                        ; $148 - ROM Size
 DB \3                        ; $149 - RAM Size
 DB 1                         ; $14a - Destination code
 DB $33                       ; $14b - Old licensee code
 DB 0                         ; $14c - Mask ROM version
 DB 0                         ; $14d - Complement check (important)
 DW 0                         ; $14e - Checksum (not important)

        ENDM

memory.inc

; vi:syntax=rgbds
; https://github.com/nezticle/rgbds-template/blob/master/src/memory.asm

SECTION "Memory1 Code",ROM0

INCLUDE "hardware.inc"

; Macro that pauses until VRAM available.

lcd_WaitVRAM: MACRO
        ld      a,[rSTAT]       ; <---+
        and     STATF_BUSY      ;     |
        jr      nz,@-4          ; ----+
        ENDM

        PUSHS           ; Push the current section onto assember stack.

;***************************************************************************
;*
;* mem_Set - "Set" a memory region
;*
;* input:
;*    a - value
;*   hl - pMem
;*   bc - bytecount
;*
;***************************************************************************
mem_Set::
    inc    b
    inc    c
    jr    .skip
.loop    ld    [hl+],a
.skip    dec    c
    jr    nz,.loop
    dec    b
    jr    nz,.loop
    ret

;***************************************************************************
;*
;* mem_Copy - "Copy" a memory region
;*
;* input:
;*   hl - pSource
;*   de - pDest
;*   bc - bytecount
;*
;***************************************************************************
mem_Copy::
    inc    b
    inc    c
    jr    .skip
.loop    ld    a,[hl+]
    ld    [de],a
    inc    de
.skip    dec    c
    jr    nz,.loop
    dec    b
    jr    nz,.loop
    ret

;***************************************************************************
;*
;* mem_Copy - "Copy" a monochrome font from ROM to RAM
;*
;* input:
;*   hl - pSource
;*   de - pDest
;*   bc - bytecount of Source
;*
;***************************************************************************
mem_CopyMono::
    inc    b
    inc    c
    jr    .skip
.loop    ld    a,[hl+]
    ld    [de],a
    inc    de
        ld      [de],a
        inc     de
.skip    dec    c
    jr    nz,.loop
    dec    b
    jr    nz,.loop
    ret


;***************************************************************************
;*
;* mem_SetVRAM - "Set" a memory region in VRAM
;*
;* input:
;*    a - value
;*   hl - pMem
;*   bc - bytecount
;*
;***************************************************************************
mem_SetVRAM::
    inc    b
    inc    c
    jr    .skip
.loop   push    af
        di
        lcd_WaitVRAM
        pop     af
        ld      [hl+],a
        ei
.skip    dec    c
    jr    nz,.loop
    dec    b
    jr    nz,.loop
    ret

;***************************************************************************
;*
;* mem_CopyVRAM - "Copy" a memory region to or from VRAM
;*
;* input:
;*   hl - pSource
;*   de - pDest
;*   bc - bytecount
;*
;***************************************************************************
mem_CopyVRAM::
    inc    b
    inc    c
    jr    .skip
.loop   di
        lcd_WaitVRAM
        ld      a,[hl+]
    ld    [de],a
        ei
    inc    de
.skip    dec    c
    jr    nz,.loop
    dec    b
    jr    nz,.loop
    ret

        POPS           ; Pop the current section off of assember stack.

splash.inc

; Made by tbsp, public domain
; CLASSIC_GAMEBOY_FONT.Z80
 
TilesFont::
DB $00,$00,$3C,$3C,$4E,$4E,$4E,$4E
DB $7E,$7E,$4E,$4E,$4E,$4E,$00,$00
DB $00,$00,$7E,$7E,$60,$60,$7C,$7C
DB $60,$60,$60,$60,$7E,$7E,$00,$00
DB $00,$00,$7C,$7C,$66,$66,$66,$66
DB $7C,$7C,$60,$60,$60,$60,$00,$00
DB $00,$00,$7C,$7C,$66,$66,$66,$66
DB $7C,$7C,$68,$68,$66,$66,$00,$00
DB $00,$00,$3C,$3C,$60,$60,$3C,$3C
DB $0E,$0E,$4E,$4E,$3C,$3C,$00,$00
DB $00,$00,$7E,$7E,$18,$18,$18,$18
DB $18,$18,$18,$18,$18,$18,$00,$00

sprites.asm

; vi:syntax=rgbds

INCLUDE "hardware.inc" ; standard hardware definitions from devrs.com

; IRQs
SECTION    "Vblank",ROM0[$0040]
;    push hl
;    ld hl, VBLANK_FLAG
;    ld [hl], 1
;    pop hl
    reti
SECTION    "LCDC",ROM0[$0048]
    reti
SECTION    "Timer_Overflow",ROM0[$0050]
    reti
SECTION    "Serial",ROM0[$0058]
    reti
SECTION    "p1thru4",ROM0[$0060]
    reti

SECTION "FreeSpace",ROM0[$0068]
INCLUDE "memory.inc"

wait_vblank:
;    push hl
;    ld hl, VBLANK_FLAG
;    xor a
;.wait:
    halt
;    cp a, [hl]
;    jr z, .wait
;    ld [hl], a
;    pop hl
    ret

StartLCD:
    ld a, LCDCF_ON|LCDCF_BG8000|LCDCF_BG9800|LCDCF_BGON|LCDCF_OBJ8|LCDCF_OBJON
    ld [rLCDC], a
    ret

StopLCD:
    ld a, [rLCDC]
    rlca                ; Put the high bit of LCDC into the Carry flag
    ret nc              ; Screen is off already. Exit.
    call wait_vblank
; Turn off the LCD
    ld a, [rLCDC]
    res 7, a            ; Reset bit 7 of LCDC
    ld [rLCDC], a
    ret

SECTION    "start",ROM0[$0100]
nop
jp    begin

INCLUDE "header.inc"
 ROM_HEADER    CART_ROM_MBC1_RAM_BAT, CART_ROM_256K, CART_RAM_16K

SECTION "Game logic", ROM0
INCLUDE "splash.inc"

begin:
    nop
    ld a, IEF_VBLANK
    ld [rIE], a
    ei
    ld    sp, $e000        ; initialize the stack pointer
init:
    ld    a, %11100100     ; Window palette colors, from darkest to lightest
    ld    [rBGP], a        ; CLEAR THE SCREEN
; Load tiles
    ld    a,0            ; SET SCREEN TO TO UPPER RIGHT HAND CORNER
    ld    [rSCX], a
    ld    [rSCY], a
    call    StopLCD        ; YOU CAN NOT LOAD $8000 WITH LCD ON

; Blank OAM
    ld a, $00
    ld hl, _OAMRAM
    ld bc,$FE9F-_OAMRAM+1
    call mem_Set

    ; Blank HRAM
    xor a
    ld hl, _HRAM
    ld bc, 63
    call mem_Set

    ; Blank WRAM
    xor a
    ld hl, _RAM
    ld bc, $DFFD-_RAM+1 ; Don't clear stack
    call mem_Set

    ; BLANK VRAM
    ld a, $FF
    ld hl, _SCRN0
    ld bc, _SCRN1-_SCRN0
    call mem_SetVRAM

; Turn on LCD
    call StartLCD

    ld    hl, TilesFont
    ld    de, $8A00
    ld    bc, 96
    call    mem_CopyVRAM    ; load tile data

.place_sprites:
    call wait_vblank
    ld a, 110
    ld [$fe00], a
    ld [$fe04], a
    ld [$fe08], a
    ld [$fe0c], a
    ld [$fe10], a
    ld [$fe14], a
    ld [$fe18], a
    ld [$fe1c], a
    ld [$fe20], a
    ld [$fe24], a
    ld a, 44
    ld [$fe01], a
    ld a, $a2
    ld [$fe02], a
    ld a, 52
    ld [$fe05], a
    ld a, $a3
    ld [$fe06], a
    ld a, 60
    ld [$fe09], a
    ld a, $a1
    ld [$fe0A], a
    ld a, 68 
    ld [$fe0D], a
    ld a, $a4
    ld [$fe0E], a
    ld a, 76 
    ld [$fe11], a
    ld a, $a4
    ld [$fe12], a

    call wait_vblank
    ld a, 94 
    ld [$fe15], a
    ld a, $a4
    ld [$fe16], a
    ld a, 102 
    ld [$fe19], a
    ld a, $a5
    ld [$fe1A], a
    ld a, 110 
    ld [$fe1D], a
    ld a, $a0
    ld [$fe1E], a
    ld a, 118 
    ld [$fe21], a
    ld a, $a3
    ld [$fe22], a
    ld a, 126 
    ld [$fe25], a
    ld a, $a5
    ld [$fe26], a

    ld d, 0
.splash_loop:
    halt
    jr .splash_loop