A85: Re: Assembly-85 Digest V1 #530

To: <assembly-85@towerguard.unix.edu.sollentuna.se>
Subject: A85: Re: Assembly-85 Digest V1 #530
From: "Jimi Malcolm" <MalcolmJ1@email.msn.com>
Date: Sat, 27 Mar 1999 23:36:33 -0500
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-85@lists.ticalc.org


here's another routine that i have never tested and wrote just for this
email:
jimi

start:
    ld hl,VIDEO_MEM+3    ;where to begin  (you put this in your email)
    ld b,<however many pixels high the screen is...68 i think or something
like that>
s_1:
    ld a,%0000 0001        ; the 1 is the bit you want set....you can move
that
                                            ;  you can make it look cool
with "ld a,%0000 0101"
                                        ; that way you'd have two lines
    or (hl)            ; you want don't want to erase anything that's
already on the screen i guess
    ld (hl),a        ; load the final product onto the screen, lighting up
the new pixel (line)
    add hl,16    ; add 16 to get the next row down!
    djnz s_1    ; go and do it all over again!


<<2. Is there a smaller/faster way to draw a vertical
line(ok, this is my first program, so...)?
;---------------
ld bc,$4001 ;height=$40:byteofset%00000001
ld de,$0010 ;next line is vidmem+16...
ld hl,VIDEO_MEM+3

Lineloop:
        ld a,(hl)
or c            ;I want to OR the PixelOnScreen
ld (hl),a
        add hl,de
        djnz Lineloop>>

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