New answers tagged amiga
1
Answering my own question as a way to spur up discussion two years later...
Based on this question and its accepted answer here: What are the Ultra-Highres registers in ECS and AGA for? , namely, the fact that AGA, and perhaps ECS already, has a DUAL/UHRES mode that is meant to drive an external CLUT/DAC connected to Vram to generate a second, high-...
2
I think the idea behind UHRES was to have VRAM connected to an indipendent DAC/CLUT.
The VRAM has a second data port where it outputs the content of a row.
This output was connected to the DAC.
Agnus had the responsibility to configure the second data port at each scanline. For this reason, it emits, at the 2nd cycle, on the RGA bus a 078 (BPLHDAT) and on ...
1
I think you are not taking into account both of the new video modes supported by the Amiga ECS chipset using the higher dot clock:
Super-Hires Mode: 1280 pixel horizontal resolution, interlaced or non-interlaced lines, with a 15.7 kHz horizontal frequency.
Productivity Mode: 640 pixel horizontal resolution (same as Hires), 480 lines, with a 31 kHz ...
1
The ECS chipset appears to have had support for a new UHRES mode added, but it was never completed. It seems to be related to the Ranger chipset developed by Jay Miner.
The idea seems to have been to move display fetch off Agnus to a separate chip with its own VRAM, which was never completed. That would allow greater bandwidth to video memory, one of the ...
13
[Insert: Some site history
While the German subsidary (Commodore Büromaschinen GmbH), originally set in Neu-Isenburg near Frankfurt, had facilities for import handling and distribution, this was soon moved to a distribution center in Braunschweig and accomplished by a final assembly line and a development center. At the same time the company moved into ...
1
Hi we've started this project for new Amiga-style keyboards and mice here: https://www.simulant.uk/input/
Top 50 recent answers are included
