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Good stuff Ed and thanks for taking the time to explain it as well. Very enjoyable seeing the results actually working in reel time. (see what I did there). I'll get me coat!

Proof Of Concept Established, now for the purists Next step is to put the credits back to 50p for 5 plays and modify the code to enable a limit on the gamble to £100. So the steps that need to follow for changes to the gamble limit will be: Change the limit detection from being £5 which is 50 on the M0087 - units ram address to a new setting of £100 which is 10 on the M0086 - tens RAM address. The challenge is that when a gamble is above £100 the machine will auto collect. However the machine will pay out whatever the gamble value is calculated to be, so if we gamble £70 x 2 the win will be £140. We want to limit this to £100. So we need to add a step after the win is recognised to reset the win value back to a maximum of £100 This is done by when the value of M0086 (the tens RAM address) is greater than or equal to 10 then the auto collect function is called, but we need to add an additional step to set the value of M0086 to 10 and M0087 to 00 from whatever it was before. Now making the payout £100. This is done by adding an additional Sub Routine to set the values then when complete to return to where it was before to payout. First step, put the 50p credit back to 05 which is 5 credits, this value is in HEX so you can change this to whatever you want. i.e. 20 in HEX is 14. Now change the RAM address used to check for the auto collect to the tens address of M0086 and change the value to 10. We also see the code below BHI Z6EE8. Branch to a new address if the argument above is higher or equal to the operand. i.e M0086 is greater or equal to 10, then go to address Z6EE8 This is the line before: After the changes: Now look at Z6EE8 and make some changes to jump to a spare RAM address where we can accommodate some new code. This is what Z6EE8 looked like before: Now we change the code to switch the LDA command and the JSR, so we jump to the sub routine first, do what we want and then return to complete the LDA command and carry on with the code on the line. Our new line will be created at RAM address Z7718, this is what it looks like before: Now we can insert a sub routine to set the values of M0086 and M0087 to 10 and 00 respectively. So load accumulator A (LDA) with 10 and then store accumulator A (STA) in to M0086, then repeat for M0087 with 00. Then return back to the line Z6EE8 to carry on with the LDA #$80 command and then carry on with the code. These are the changes made and of course we can call the jackpot jingle from the line Z7718 if the line that executes the jingle can be found. Here's is the new code running on the emulator and you can see where I change the RAM values to create a £55 gamble pot and then to gamble x 2 which generates a win of £110. The code then jumps to my new line of Z7718 and is stopped for test with a breakpoint, you can then see the new code in the debug view. Then we restart and the machine pays out £100. Here's the decompiled code with the changes I made and also the new rom file for an 8k eprom 2764 based on the original SPLS9F dump from my machine. I will burn this later and try it in my machine, but now if you are lucky enough you can pretty much gamble any win to £100 except the no lose gamble game. For example If there is a £10 win, this plays the jackpot jingle and then allows you to gamble on the roulette wheel. spls9f2 £100 limit.rtf spls9f 5 credit £100 Limit V1.bin.zip

I had something similar happen to mine once, a RAM clear seemed to fix it. Use DIP switch 8 on SW2 (left hand). Mine is fitted with a coin cell so I just popped it out to clear the RAM.

This is just about perfect Ed. You've done a brilliant job and yep that jp jingle is the icing on the cake .just a further point to not having a larger gamble is the fact that the tubes only hold about £60 each of 50p s so would be incapable of paying more than £120 and at a push another £15-20 in 10p s .so the £100 limit is perfect .just one further mod to make would be to get the no lose gamble feature play the jp tune if the £10 is awarded .at the moment it doesn't do this which is a little disappointing .not sure weather it's a good idea for the no -lose £10 to self collect after the jungle or not or weather its too much work to do anyway ..Will the machine recognise % s with the added gambles and wins?

This is great stuff. Good job Eddie