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VDC-FLI   [2011]

VDC-FLI Released by :
Akronyme Analogiker

Release Date :
12 June 2011

Type :
C128 Release

User rating:awaiting 8 votes (5 left)   See votestatistics

Credits :
Code .... tokra of Akronyme Analogiker

Download :
http://csdb.dk/getinternalfile.php/97931/vdc-fli.zip (downloads: 703)
http://csdb.dk/getinternalfile.php/98135/converters-source.zip (downloads: 247)

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Production Info
Submitted by tokra on 12 June 2011
This mode came about trying to figure out how the (brilliant) "Risen from Oblivion"-demo does its own FLI-mode. By hardware the VDC only supports a maximum of 8x2 color-blocks by setting register 9 of the VDC to two rasterlines. If you try to set it to 1 rasterline to get an 8x1 mode the VDC won't activate the display and you only get a blank screen. The trick to force the VDC to display is to watch bit 5 of$d600 (VBLANK) and switch register 9 to one rasterline right after the VLANK-period has finished and back to any other value once VBLANK starts again. This fools the VDC into displaying the 8x1 mode. However since the VDC now has to fetch the character- as well as the attribut-byte for every rasterline you can only address a screen of 60 chars wide (=480 pixels), otherwise the screen gets garbled. The register 9-switcher is realized as a quick and dirty 47 byte assembler routine. If you want to do it proper you will have to set up a VDC-raster-interrupt and for that you first need to measure your specific VDC-chip's speed. That is what "Risen from Oblivion" does when you start it.
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