From d72d373e8353d086987f516f42a90d79d6d637a6 Mon Sep 17 00:00:00 2001 From: "ol.sc" Date: Mon, 2 May 2011 11:23:30 +0000 Subject: [PATCH] Computed pixel aspect ratio (PAR) by presuming a display aspect ratio (DAR) of 4/3 for a classic CRT and using the given driver resolutions as storage aspect ratio (SAR). git-svn-id: svn://svn.cc65.org/cc65/trunk@5017 b7a2c559-68d2-44c3-8de9-860c34a00d81 --- libsrc/geos/devel/geos-tgi.s | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/libsrc/geos/devel/geos-tgi.s b/libsrc/geos/devel/geos-tgi.s index d7484b47f..247920df1 100644 --- a/libsrc/geos/devel/geos-tgi.s +++ b/libsrc/geos/devel/geos-tgi.s @@ -48,7 +48,7 @@ yres: .word 200 ; Y resolution pages: .byte 1 ; Number of screens available .byte 8 ; System font X size .byte 8 ; System font Y size - .word $100 ; Aspect ratio: 1.0 +aspect: .word $00D4 ; Aspect ratio (based on 4/3 display) ; Next comes the jump table. With the exception of IRQ, all entries must be ; valid, and may point to an RTS for test versions (function not implemented). @@ -139,10 +139,13 @@ INSTALL: ; check for VDC version and update register $19 value @L80: - lda #<640 - ldx #>640 - sta xres - stx xres+1 + ; double the x resolution and halve the aspect ratio + + asl xres + rol xres+1 + + lsr aspect+1 + ror aspect ; update number of available screens -- 2.39.5