The Sinclair QL Forum

Help !!

I got a ql which only loads the minerva logo and does not continue any futher ( so the rectangle on the left with ram and time is not present ).

- tried several roms .
- left rom position
- 27c512 adapter board


Any ideas ?

If it comes that far, most of CPU, ROM and RAM must be functioning.

About at this point QDOS changes from linearly executing initialization code to becoming an interrupt-driven system. I'd check if the interrupt lines /IPL0-2 and /IPL1 on the CPU for pulses. The ZX8302 should generate a 50Hz signal on these lines, and If that's missing, the symptoms would look like what you're seeing.

Good morning techy!

Getting that far through the DRAM test to display the Minnie logo is typically (though not 100% of the time) indicative of an issue accessing the 8302 ULA whilst attempting to read its RTC.

Do you have a spare, known good ZX8302 to drop in and test?

at work right now ,

so quick test revealed ;

8302 -> no change
8301 -> no change
02 and 01 -> no change
processor -> no change
original rom's -> no change

it is an iss 7 board

Hi

In my experience, the Red Minerva Logo on the screen only, was a faulty 8049, so maybe worth trying that.

Thanks to all for trying to help me !!

@ derek ,


That was the problem .

Apparently the 8049 died .