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.
- Screen does 'pop' when turned on and it's a different level of 'black'. No borders. No sparkles. Just black.
- The power supply is under 5.2v.
- The voltage regulators on the board are outputting the right voltages.
- Removed the SID
- Removed one of the CIA's (the other is socketed)
- 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 :/).
- The reset line stays low then goes high after a few secs.
- 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 with no response (but I'm not %100 sure the drive is working). Is there something I can do with the tape drive? (When I press Play it spins continiously).
None of the chips feel particularly hot (The VIC-II's get a bit hot but afaik that's normal).
I don't have another C64 to swap things with. I have a multimeter with freq meter. A 8ch 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
- German stuff
- "if the 60Hz can be found on _IRQ, the KERNAL was able to program the CIA timer"
- Investigate that 'himem' bodge wire...
- Diagnostic guide RAM Check...
- Replace CIA and try typing poke commands again...
- Remove more chips...