C64
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- http://www.linusakesson.net/scene/lunatico/misc.php
- http://www.linusakesson.net/programming/poems-for-bugs/index.php
- http://www.aaronbell.com/secret-colours-of-the-commodore-64/
- https://www.metafilter.com/114704/Demoscene-The-Art-of-the-Algorithms
- https://digitalerr0r.net/2011/04/30/commodore-64-programming-6-raster-interrupts/
- https://csdb.dk/forums/?roomid=11
- Black PSU - 5.1v/10.3v - 5.13v/10.40v
- White PSU - 5.15v/10.2v - 5.19v10.43v
- Remove ICs
- Heatsinks
- #11 "Zero Insertion Farce?" — Installing ZIF Sockets on a C64 Motherboard
- Sells Nordic Replays, C64 Reloaded Motherboards, SuperPLA
- EEPROMs as ROMs
- Using the USB Logic Analyzer with sigrok PulseView
- C64 Video Cables
- https://github.com/fdivitto/FabGL
Dead Drive
- https://www.lemon64.com/forum/viewtopic.php?t=64021
- https://www.youtube.com/watch?v=CDj6JEqPkzA
- C15 Capacitor
Dead C64
- Black Screen Guide
- Another Black Screen Guide
- https://www.youtube.com/watch?v=Mn1keRFXX7I
- Test Fuse
- Test for 5 volts on chips
- check +12V on pin 13 of the VIC
- 5 volts on userport
- https://github.com/jamarju/c64_test_tools
- Commodore 64: how to repair it, step by step
- Replacement PLA, local (more expensive), Alternative, cheaper from the store
- Replacement Capacitors
- #01 "A Change of Heart" — Commodore 64 Black Screen Repair
- aphexteknol
- the 250425 board should in fact boot to the familiar blue BASIC screen just fine without U1 and/or U2. (However, with U1 gone, e.g. the keyboard obviously won't work and with U2 gone, e.g. the serial port won't work).
VIC-II
- [1] - £23.84 (AUD$45.19)
- Commodore 64 VIC-II MOS 8565 R2 PAL video chip 5v (*TESTED*)! WRONG CHIP. Also dodgy and more expensive...
RF Mod
TODO
- Black Screen. Pulses monitor/pops when turned on.
- Power supply seems ok (5.18v). Fuse replaced (I managed to blow it while poking around with the multimeter :/)
- Nothing shows up when toggling on and of rapidly (PLA check).
- Disk drive spins up when turning on.
- Load "$",8 does nothing (not sure the disk drive is working, had to replace a capacitor). Tried poke commands to make sound without success.
Check VIC-II Vcc is 5v. pin 40 is 5vyou're looking for the RESET line to be grounded for half a second during powerup. Pin 3 of userport.RST line goes high after half a sec (and stays high)- No ram chips over heat. Only hotish chip is 6510
- Clock in on 6510 (pin 1) *seems* to be toggling (unsure, multimeter measures it lower than 5v but not ground).
- Clock out from 6510 seems to be stuck at 5v
- Address lines 0-11, seem to be under 5v but not GND. Except for pin 12, 13, 14, 15 which are 5v.
- Can I use Chroma/Luma on a composite monitor (ie for just black & white image)?
PLA
Dead Monitor(s)
- https://www.lemon64.com/forum/viewtopic.php?t=28565&%3Bstart=30
- https://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.html
- "found that CP2 has disintegrated! It`s a paper capacitor next to the power switch that has exploded, so that needs replacing.", "the x2 cap is a common failure"
Power Switch
- https://www.youtube.com/watch?v=g2lrrXp-Zn8
- http://www.retro-commodore.eu/2014/04/12/c1084-power-switch-replacement/
- https://randommayhemstuff.blogspot.com/2016/11/finally-swapped-power-switch-on.html 1084
- https://www.wagneronline.com.au/pcb-mount/switches/electronic-components/swp583-2978/347/pd/ PCB MOUNT PUSH SWITCH $11.50
- http://www.telespares.com.au/index.php?main_page=product_info&products_id=312936 (Much cheaper, not sure if the same)
- https://www.thefuturewas8bit.com/1084switch.html (OUT OF STOCK)
- https://au.element14.com/c-k-components/ne18-2a-ee-sn-p-6amp/switch-pushbutton/dp/2435346 - Maybe this is the same
- https://www.lemon64.com/forum/viewtopic.php?p=667259&sid=d8a1ae892e1436641358a9501da82ad1
Games
https://www.youtube.com/channel/UCnhr67lnXf3ZtcKLrr9-hSA/videos
Repair
I'm trying to repair my C64. It is a PAL, ASY 250425
It black screens.
- I have tried a deadtest cart but it still blackscreens.
- The power supply is under 5.2v.
- The voltage regulators on the board are outputting the right voltages.
- The reset line stays low then goes high after a few secs.
- I have replaced the PLA with a PLAnkton.
- Replaced the VIC-II with a new one.
- Replaced the clock generator with a TOLB (I'm fairly sure I broke the original while poking the crystal with a multimeter :/).
- Removed the SID
- Removed one of the CIA's (the other is socketed)
- I am getting 984.9 Khz clock in and out on the 6010.
- There is activity on the CPU's datapins.
I have tried using poke commands to generate sound without success. Also tried to make the disk drive do something via load (but I'm not %100 sure the drive is working). Is there something I can do with the tape drive?
None of the chips feel particularly hot (The VIC-II's get a bit hot but afaik thats normal).
I don't have another C64 to swap things with. I have a multimeter+freq checker. A logic probe. (No Oscilloscope).
My current next possibilities is to either: Remove the M1 RF Modulator and replace it with a hand built one. Remove the other CIA and the ROM chips and try the deadtest cart again (Since it doesn't need them). Remove all the ram chips and test them with an Arduino.
TODO
- Diagnostic guide RAM Check...
- Replace CIA and try typing poke commands again...
- Remove more chips...