Peter z80.eu
Experienced Member
- Joined
- Apr 21, 2016
- Messages
- 84
I was able to get an ATI EGA Wonder card for my IBM PC Portable. So I tested what video modes are possible with the build-in composite monitor.
CGA graphics and text modes working fine, as expected. I was also able to switch to enhanced EGA text modes with the help of "SMS.COM", ATI's utility to select several video modes. I was not able to get a good result with an EGA video mode capable game, vertical sync wasn't working correct, picture is scrolling continuosly down, it flickers and there are also additional retrace lines across the whole picture, making it impossible to work with it.
Does EGA graphics mode even interlaced not work with the composite monitor of an IBM PC 5155 ?
The monitor selection is done as recommended in the ATI manual page 13, SW1-8: ON ON ON OFF ON ON OFF ON .
Vertical hold adjustment seems to be a solution, but I am NOT aware of any adjustment possibilities of the build-in monitor...
CGA graphics and text modes working fine, as expected. I was also able to switch to enhanced EGA text modes with the help of "SMS.COM", ATI's utility to select several video modes. I was not able to get a good result with an EGA video mode capable game, vertical sync wasn't working correct, picture is scrolling continuosly down, it flickers and there are also additional retrace lines across the whole picture, making it impossible to work with it.
Does EGA graphics mode even interlaced not work with the composite monitor of an IBM PC 5155 ?
The monitor selection is done as recommended in the ATI manual page 13, SW1-8: ON ON ON OFF ON ON OFF ON .
Vertical hold adjustment seems to be a solution, but I am NOT aware of any adjustment possibilities of the build-in monitor...