k-rite Posted September 21, 2005 Report Posted September 21, 2005 here's my situation:- i was able to upload mios- then my midibox stopped working- i didn't know if my pic was bad or if i somehow fried my core, so i got a new core and put it together- i don't remember which is the old pic and which is the new pic- with one of the pics i get no midiout- with the other pic i get this:what is this? can someone please help me troubleshoot? Quote
pay_c Posted September 22, 2005 Report Posted September 22, 2005 Does your 7805 get very hot? What power supply do you use (enough power? Voltage?) ?Did you check the main voltage? +5 Volts (+/- 0,2 Volt max) / Ground? Quote
k-rite Posted September 22, 2005 Author Report Posted September 22, 2005 I'm using a core and sid from smash tv with an original c64 psu.i have 5v going to the core and 9v going to the sid. i tested IC1 on the core it has about 4.25V at:mclr(1)-Vss(12)Vdd(11)-Vss(12)Vdd(32)-Vss(31)IC2:8-IC2:5i wanted to trouble shoot the midi in, so i hooked up a 220 resistor and diode to IC1:Vss(31)-IC1:RX(26), but it just stays lit continously???any suggestions? Quote
pay_c Posted September 22, 2005 Report Posted September 22, 2005 Ooooops... 4,25 Volt are to less. Did you connect the +5 Volt as shown on UCapps.de? http://www.ucapps.de/mbhp/mbhp_4xsid_c64_psu_optimized.pdfLooks like you connected the 5 Volts to the In of the 7805?Anyhow: Does your 7805 get very hot?I *think* the PIC gets to less voltage and so goes into a boot loop - so it is sending MIDI data all the time. Quote
raphael Posted September 23, 2005 Report Posted September 23, 2005 Ooooops... 4,25 Volt are to less.pay_c is right. The brown-out feature of the PIC will reset the core, if the voltage is lower than 4.5V. So you end up in a reset loop.... Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.