Nearly there..
Posted: 24 May 2019, 23:19
I assembled my Gigatron and powered it up.
The flashing LEDs are running and the Menu appears on my monitor.
If I select anything from the Menu which requires graphics, I get problems:
Snake - brief flash of random pixels, then screen blanks, displays "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Racer - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" causes LEDs to freeze and system lock-up.
Mandelbrot - screen fills with random pixels, blanks, "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Pictures - the screen blanks, displays "no VGA signal" and stays blank. LEDs freeze and system locks-up. Pressing "start" has no effect.
Credits - appears to work fine: credits text displayed in different colours. Press "start" to reset.
Loader - displays "Ready to load" and a red stripe + a line of random pixels. Press "start" to reset.
Tetronis - brief flash of random pixels, then screen blanks, displays "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Bricks - brief flash of random pixels, then screen blanks, displays "Bricks" on a blue background. LEDs keep flashing. Press "start" to reset.
TicTacToe - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" to reset.
BASIC - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" to reset.
WozMon - - screen part filled with random pixels, plus fragments of previous display. LEDs keep flashing. Press "start" to reset.
The Gigatron is plugged in to an Asus VE249H LCD monitor. Have I found the first incompatible monitor?
The flashing LEDs are running and the Menu appears on my monitor.
If I select anything from the Menu which requires graphics, I get problems:
Snake - brief flash of random pixels, then screen blanks, displays "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Racer - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" causes LEDs to freeze and system lock-up.
Mandelbrot - screen fills with random pixels, blanks, "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Pictures - the screen blanks, displays "no VGA signal" and stays blank. LEDs freeze and system locks-up. Pressing "start" has no effect.
Credits - appears to work fine: credits text displayed in different colours. Press "start" to reset.
Loader - displays "Ready to load" and a red stripe + a line of random pixels. Press "start" to reset.
Tetronis - brief flash of random pixels, then screen blanks, displays "no VGA signal" and stays blank. LEDs keep flashing. Press "start" to reset.
Bricks - brief flash of random pixels, then screen blanks, displays "Bricks" on a blue background. LEDs keep flashing. Press "start" to reset.
TicTacToe - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" to reset.
BASIC - screen fills with random pixels, blanks, fills with random pixels. LEDs keep flashing. Press "start" to reset.
WozMon - - screen part filled with random pixels, plus fragments of previous display. LEDs keep flashing. Press "start" to reset.
The Gigatron is plugged in to an Asus VE249H LCD monitor. Have I found the first incompatible monitor?