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I'm glad to hear that you got it fixed!

I've been following what's going on with Joey's 1000PX and hoping mine would not suffer a similar fate... Well, I finally dug back into it by first replacing all electrolytic caps in the power supply.

Source code can be downloaded at fiansa.com

Where can I download this? Thanks.

My understanding is this does not effect midi transmissions or hardware compliance. Midi1.0 is still useable. Just that any midi apps, like ObjectEditorX, will require code fixes to handle midi

I would hold off on CPU replacement - unless there is no E clock output (1 MHz). Focus on U45 - are you sure you have a 74LS02? Quad NOR gate part? If you used a different part, e.g.? 74LS08 (Quad

I tried it one more time?using a new IC and made sure that pins 1 and 10 are not connected or touching any other part. ? I got the same reading (low on both pins)?which is really strange. ?I was

Yes I agree with your conclusions.? Seems as if U45 is bad again - something damaged the output drivers (pins 1 and 10) Did you use a IC socket for U45 - swap in another IC,? leave pins 1 and 10

Does that mean that current class compliant usb midi devices will not work on OS11? [email protected]> wrote:

I just learned from a fellow K1000/1200 group user last week that there are issues using ObjectEditorX with Big Sur (OS11). On doing some research I discovered that Apple have completely revised

I lifted pins 1 and 10 from the socket and got the following readings:? Pin 1?? ??Low??no pulse Pin 10???Low I was?expecting pin 1 to?pulse H and L and was surprised that it

Vladimir, I do not have direct experience with K1000/K1200, but in my job as engineer, this is typically how timers work - generating periodic or event triggered interrupts to the CPU. At reset, I

Hello mjkirk12. Do I understand correctly that the timer chip during startup should generate a signal on U45 from high to low and vice versa? If this is so, then this explains a lot, I have

Pin 17 High Pin 18 High? ?- These are OK Pin 23 Low Pin 24 Low Pin 25 Low? ?These are active low interrupts (input to CPU). U45 C Pin 5 pulses H and L *This is OK - Timer is generating periodic

I am getting the following readings on the CPU: Pin 17??High Pin 18??High Pin 23??Low Pin 24??Low Pin 25??Low U45 C Pin 5???pulses H and L Pin 6???L Pin 4???pulses

Yes, these all should normally be high. Pin 17 HALT* must be high (stops CPU when low) Pin 18 RESET* must pulse low to reset CPU.? ?(stops CPU if held low) Pins 23-25 should normally be high, but

Hi.? I will try to probe?the logic circuits later today?but?would like to clarify first?if pins 17,18, 23,?24, and 25 of U17?should be high (meaning 3-5v) for the K1000 to

If RESET_IN is low, then U44 (74AC05) should invert to give RESET* as high signal to CPU Possible causes: 1) U44 not getting + 5V power 2) U44 is bad 3) Some other device wired to RESET* is shorting

Yes, RESET asserted low (0V) holds the processor in reset -it won't start up. to run it needs to be high (3V to 5V).

CPU Pin 18 is 0 volts at power up and does?not change.?Is this the reason why it doesn't boot?? Joey