Short: PiccoloSD64 ext. driver for ShapeShifter Author: fdoro@gpnet.it (Francesco Doro) Uploader: fdoro gpnet it (Francesco Doro) Type: misc/emu Architecture: m68k-amigaos PiccoloSD64 external 24 bit video driver for ShapeShifter 1996 by Francesco Doro (fdoro@gpnet.it) Public Domain SD64evd is an external video driver for the Macintosh emulator ShapeShifter. It supports only the 24/32 bit color mode of the graphics board PiccoloSD64. This driver uses the internal blitter of the SD64 for the refresh; that blitter is really powerful. A blitter done refresh gives the following advantages: - Speed: a 640x480 24 bit display takes 0.05 sec to be refreshed. - Doesn't need MMU. - It is CPU indipendent: the CPU has only to wait until the blitter finishes so the speed is the same on a 14 Mhz 68EC020 as on a 50 Mhz 68060 (but only the refresh speed is the same...). - It is bus' bandwidth indipendent: the refresh speed is the same for a Zorro2 installed board as for a Zorro3 (again, only the refresh speed). - Doesn't need Amiga's memory: both virtual and real display resides on the board's video memory. ...But gives also this disavantage: - Since both virtual and real display must reside in the video memory, a 2 Meg SD64 allows max a 640x400 24 bit display. *** Requirements: Besides a working Amiga and PiccoloSD64, you need a registered and correctly installed CyberGraphX and a recent version of ShapeShifter, whether registered or not. *** Features: At the moment SD64evd supports these screen modes: 512 x 384 x 24 bit 576 x 432 x 24 bit 640 x 400 x 24 bit 640 x 480 x 24 bit (only for 4 Meg SD64) 768 x 576 x 24 bit (only for 4 Meg SD64) 800 x 600 x 24 bit (only for 4 Meg SD64) 832 x 624 x 24 bit (only for 4 Meg SD64) The assembly source is included.