2 ms·
I don't think the Amiga has either parallel / per plane chip memory, or any need for backwards compatibility with CGA.
by fredoralive 6mo ago
I don't think the Amiga has either parallel / per plane chip memory, or any need for backwards compatibility with CGA.
- ZFH 6mo agoIt was all about saving RAM on the Amiga.
- amiga386 6mo agoIndeed. As per this timing diagram, Denise accesses each 16-bit word of each bitplane sequentially. Any bitplanes you turn off, the more cycles available for blitter... or CPU! Fun fact! The Amiga Workbench is 4 colour hires by default, because hires is impressively businessy... but 8 or 16 colour hires would lock out the CPU most of the time, as the chipset would have to dip into the 68000's even cycle RAM accesses and stall it. 4 colour hires lets the CPU (on a chipmem-only system) run at full speed! http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node02D4.html http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_gui...