Hopper 6502 SBC: now has I2C and serial EEPROM 

No. I used the same PLD in my previous design too and it never got warm on that board either.

@@biggertigger Wonder what i could be doing wrong then. My design works peerfectly but the PLD gets pretty damn hot.

What's the part number of your PLD and what speed are you running the CPU at? Mine is the F22V10C-7PX (7ns propagation delay) and I'm running at 8MHz (125ns clock cycle period). The slowest 22V10C would be around 25ns propagation delay. Clock period for a 14MHz 6502 would be 71.4ns - at that point that's a significant chunk of the clock cycle being allocated to glue logic. I still think it shouldn't get warm (the negative effect should be unreliable behaviour). Another possible reason for heat could be overloading one of the output pins by trying to drive too much. Have you shared your schematic anywhere? I searched for generic overheating reasons for CPLDs. Maybe one of these triggers an idea of what's going wrong: - applying a higher voltage than specified can increase power consumption and heat generation - driving too many loads or driving outputs that require more current than the PLD is rated for can cause excessive current draw and heating - connecting too many inputs to a single output (high fan-out) can increase the load on the output driver, causing it to draw more current and generate more heat - if the internal logic of the PLD is poorly designed, it can lead to unintended oscillations, which can increase power consumption

@@biggertigger Thank you for being so incredibly helpful, it's difficult to find information about these old plds haha. The part im using is ATF22V10C-10PU. I don't have the schematic in digital form unfortunatley, but basically it's just simple glue logic, I'm using all the IN pins as adress input and the I/O pins as outputs. I run the system at 8mhz, same as you. The last thing you point out there might be the culprit. "if the internal logic of the PLD is poorly designed, it can lead to unintended oscillations, which can increase power consumption" But I looked at your PLD code and it's pretty similar to mine. I am however not using pin 1 as the input for the clock, the clock is connected to another IN pin. The output is connected to at most 5 CMOS inputs, which should be within spec. The system runs at 5V. When meassuring with a heat camera the PLD stays at a constant 50degrees celsius or 122degrees farenheit