Zx Spectrum CP/M ASM test

HelloWorld.asm

; CP/M example
    .org $100
    ld hl, Message
    call Print    
    call $0000 ; CP/M warm boot
Print:					
    ld a,(hl)
    cp '$'             
    ret  z
    push hl
    ld c, $02 ; CP/M BIOS function 0x02 - CONOUT
    ld e, a
    call $0005 ; call CP/M BIOS entry point at 0x0005
    pop hl
    inc  hl
    jp   Print    
Message: ; test ESCAPE-codes as described in https://www.worldofspectrum.org/Plus3CPMManual/appendix3.html
    .db $1B,'E' ; clear screen
    .db $1B,'b',80 ; set light green color
    .db $1B,'Y',5+$20,10+$20 ;move cursor to (x,y)=(10, 5)
    .db "Hello, world! This is mighty CP/M test.",$0d,$0a,'$'

SwitchTo48BasicROM.asm

; switch ROM banks from CP/M test
    .org $100
    di
    ld a, 16 ; switch ROM horizontal (D4)
;    ld (SYSVAR_7FFD_STATE), a
    ld bc, $7FFD
    out (c), a    
    ld a, 4 ; switch ROM vertical (D2)
;    ld (SYSVAR_1FFD_STATE), a
    ld bc, $1FFD
    out (c), a
    ei
    rst $00 ; reboot