CompuServe Messages

The C= chip designers did a great job maintaining compatibility between the enhanced chip set and the current one. All the current amiga modes behave the same with the new chips and are deinterlaced by the flicker fixer. The new mode (640 x 400, non-interlace, 4 colors out of 64) can be used with an appropriate monitor attached to the 23 pin video connector. While the new mode is in use, the flicker fixer does not operate. The board does not need to be removed. The new mode is similar to the flicker fixer deinterlacing a two bitplane screen. The differences are that the flickerfixed screen can use the normal 4096 color palette and does not use additional chip memory bandwidth. The bandwidth difference will be significant on the workbench screen. I expect that screens operating in the new mode will not slide. Both the new mode and flicker fixer require monitors that can handle 31.5 KHz horizontal. Any monitor which can use the new mode should be able to operate with flicker fixer. Since flicker fixer converts all modes to the higher scan rate, it can be used with VGA single-frequency monitors. These monitors would not be a good choice for use with the ECS since all modes other than the non-interlace one will run at 15.75 KHz. Peter.