Sinclair ZX80 / ZX81 / Z88 Forums

I rewrote both the EPROM and the firmware and nothing has changed, I still have error 9 when I try to load the Zedragon

A problem with the AY unit perhaps? I only say this as it's one of the few games to feature sound effects and music and if your other games work it would suggest the ZXpand is not faulty.

Have you tried changing the 64/128 jumper on the UDG unit to see if that has any effect?

Moggy wrote: ↑Wed Jun 27, 2018 1:18 pm A problem with the AY unit perhaps? I only say this as it's one of the few games to feature sound effects and music and if your other games work it would suggest the ZXpand is not faulty.

No, I'm using only ZXpand and UDG4ZXpand, no other interface.

Have you tried changing the 64/128 jumper on the UDG unit to see if that has any effect?

No, this not make sense but I will try it anyway

Thanks Moggy

kmurta wrote: ↑Wed Jun 27, 2018 7:10 pm

Moggy wrote: ↑Wed Jun 27, 2018 1:18 pm A problem with the AY unit perhaps? I only say this as it's one of the few games to feature sound effects and music and if your other games work it would suggest the ZXpand is not faulty.

No, I'm using only ZXpand and UDG4ZXpand, no other interface.

Have you tried changing the 64/128 jumper on the UDG unit to see if that has any effect?

No, this not make sense but I will try it anyway

Thanks Moggy

If you have no AY unit attached then I think that could be the problem as the STC (music) file player built into ZEDRAGON ,I think, will be looking for that device and if it is not there it may be why it is throwing out the hardware error code 9.

Andy is best placed I think to answer that question.

Um I'm pretty sure the music player will just carry on regardless... Unless Charlie made some special code to try and detect zon-x Vs Mr X as they are on different ports.

The player itself just sends data out to ports it doesn't care if the port does not exist the data is just lost and nothing bad happens.

Regards andy

Andy Rea wrote: ↑Thu Jun 28, 2018 12:32 pm Um I'm pretty sure the music player will just carry on regardless... Unless Charlie made some special code to try and detect zon-x Vs Mr X as they are on different ports.

The player itself just sends data out to ports it doesn't care if the port does not exist the data is just lost and nothing bad happens.

Regards andy

Yep just tried it on Eighty One without the Zonx and it works so if the emulator is accurately following the real thing then it should be ok on a real zeddy also.

Will dig out my oldest Xpand tonight and see if I can recreate kelly's problem.

Tried it out on an issue 1 and 3 Xspand and alls well at my end so not sure what's going on with kelly's Xpand.

now then.... IIRC zedragon writes a hi-score to the EEprom on the BigFatPic wonder if that EEprom has become corrupt ? the question is how to test / reset if that is the case ?

We could really do with the master himself...

if you wanna trawl a zillion lines of code its on github.. a quick google search should find it or Click Here

regards Andy

I have discovered that error 9 is given only when the autoboot is enabled (CONFIG "C=7F"). With autoboot disabled, I have only the K cursor. My conclusion is that the program load is not completed and so the zeddy is restarted. I'm going to use another ZX81 and ZXpand from a friend to try isolate the source of the problem, if it is on the ZX81 or if it is on ZXpand.

Thank you very much, Andy and Moggy, for your precious attention.

I'm sure the autoboot is only there to load the MENU.p file for ZXpand commander so perhaps it's that p file that's corrupt?

Just a thought.


Here's my working menu file for comparison.