Nice video! :) You resistor value worry me a bit. You should multiply them by 10 before you test any more 6507's. The databus is probably fine since you have RW tied high but I'd still put 10k in case it does something funky during powerup. The address pins should not be sourcing > 6mA - that'll let the magic smoke out if it's close already or at least burn the NMOS gate pullup. Also, remember there's no 65C07 - the 6507 will start losing register data < 10kHz. From experience the program counter is a bit more resilient than that so for the NOP test here, you might get away with it. It's a quick, cheap and easy way to test if a 6507 is likely to work but of course it won't test registers.
@@TimsRetroCorner It even tests the 6530 and 6532 (!) chips in a Pet 4040 Floppy drive control board. I've use it to test 6504s, already. I really liked you showing the difference between the 6504 and the 6507. I thought the Atary 2600 used the 6504, now I have learned - almost, just missed it by 3 - heh heh
Nice video! :)
You resistor value worry me a bit. You should multiply them by 10 before you test any more 6507's. The databus is probably fine since you have RW tied high but I'd still put 10k in case it does something funky during powerup.
The address pins should not be sourcing > 6mA - that'll let the magic smoke out if it's close already or at least burn the NMOS gate pullup.
Also, remember there's no 65C07 - the 6507 will start losing register data < 10kHz. From experience the program counter is a bit more resilient than that so for the NOP test here, you might get away with it. It's a quick, cheap and easy way to test if a 6507 is likely to work but of course it won't test registers.
Always learning :)
...or a BackBit Chip Tester Pro
Sure, if you've got a spare couple of hundred bucks and don't mind waiting for transatlantic shipping ;)
@@TimsRetroCorner It even tests the 6530 and 6532 (!) chips in a Pet 4040 Floppy drive control board. I've use it to test 6504s, already. I really liked you showing the difference between the 6504 and the 6507. I thought the Atary 2600 used the 6504, now I have learned - almost, just missed it by 3 - heh heh
Well, I'm taking a different approach to testing the 6532.... but that's for another video!