X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/14778cde2df07491e9c2e8da0e8a1ab8724e6cec..c279b66691509cfc4445a568dab29a3282f03f3f:/diag.asm diff --git a/diag.asm b/diag.asm index e7bb0d4..e9fff6a 100644 --- a/diag.asm +++ b/diag.asm @@ -94,12 +94,8 @@ putscreen: ld hl, $8000 ; Copy two tiles. ld de, tiles ld c, $20 -.cloop: push hl - ld h, d - ld l, e - ld a, [hl] +.cloop: ld a, [de] inc de - pop hl ld [hli], a ld [hli], a dec c @@ -145,30 +141,19 @@ vbl: ld [$FF0F], a ld a, [$FF51] - ld b, a - and $80 - cp $80 - jr nz, .nothing - ld c, $0 + bit 7, a + jr z, .nothing - ld a, b - and $1 - cp c + bit 0, a call nz, .scyup - ld a, b - and $2 - cp c + bit 1, a call nz, .scydown - ld a, b - and $4 - cp c + bit 2, a call nz, .scxup - ld a, b - and $8 - cp c + bit 3, a call nz, .scxdown .nothing: