Hi thank you, it is just a normal 48k spectrum issue 2, was not aware there were different issue 2s? It is using stock ULA and has been recapped/7805 replaced with switching unit. Loading from tape on an old Panasonic rebranded tape player from the 80s, tried different tapes just in case but it made no difference.
I have also run zxdiag rom soak test for several hours just to check everything but it is fine. It is only this game that crashes that I have found.
sorry, my mistake, I read your post too quickly and thought you meant +2. Could you try the following for me:
PRINT PEEK 2815 : PRINT PEEK 2816
And tell me the results. keyboard shortcut for peek is caps+symbolshift + O
If you don't get 34 and128 then you have a non-standard ROM which could be the cause of the issue. If not, I'm somewhat stumped!
thanks!
So I built a Spectrum Issue 3b from scratch using all new parts, it works perfectly. But this game crashes in exactly the same way as on the original Issue 2. So the only thing in common hardware wise is the original (1980s) Ram Turbo Joystick interface... unplug that and the game works fine. Maybe some bug in the joystick controller?
right, I think I understand the issue - I'm afraid the game is not compatible with certain old joystick interfaces which don't actually follow the correct protocols and cause an issue with the interrupt. In the 80s, coders would create a 257 byte lookup table to account for this issue as it was a fairly common issue, but this is the first time I've had anyone have this issue.
