Q40 and Q60 video controller for flatscreen monitors
Posted: Tue May 01, 2018 9:36 am
Hi,
is there someone who wants to supply Q40 and Q60 users with an alternative video controller chip for flatscreen monitors? Derek has so much work with the Q68 already, maybe better if somebody else steps in.
The new video controller creates a 1024x768 signal for the monitor. The Q40/Q60 resolutions are matched to pixels exactly, with the consequence that one third of the screen remains black. The vertical refresh rate was reduced to 50 Hz. This alternative video chip can only be a compromise, and there will be no guarantee to work perfectly everywhere. However, on all tested flatscreen monitors there were acceptable results by now.
For this change, one of the socketed PLCC chips on the Q40/Q60 motherboard must be replaced, marked in blue:
Partname of the chip is ispLSI1016-80LJ44 (or ispLSI1016-90LJ44). A Lattice programming adaptor is required.
Peter
is there someone who wants to supply Q40 and Q60 users with an alternative video controller chip for flatscreen monitors? Derek has so much work with the Q68 already, maybe better if somebody else steps in.
The new video controller creates a 1024x768 signal for the monitor. The Q40/Q60 resolutions are matched to pixels exactly, with the consequence that one third of the screen remains black. The vertical refresh rate was reduced to 50 Hz. This alternative video chip can only be a compromise, and there will be no guarantee to work perfectly everywhere. However, on all tested flatscreen monitors there were acceptable results by now.
For this change, one of the socketed PLCC chips on the Q40/Q60 motherboard must be replaced, marked in blue:
Partname of the chip is ispLSI1016-80LJ44 (or ispLSI1016-90LJ44). A Lattice programming adaptor is required.
Peter