The red marble was fully programmed and behaves the same as the blue marble. Marble Madness has an unfinished two-player mode. Graphics for selecting 1 player / 2 players are present at offset 0xD229, and are loaded into VRAM at the "Roll marble to choose" screen. However, the corresponding tile map indexes are not present in the ROM, and the top part of the graphics was overwritten by the used logo. 5 Unused No Input Message Screen FunctionsĪn earlier Digital Eclipse logo is present at offset 0xC0BAC, and is loaded into VRAM at address 0x30:0x402A. #C64 marble madness music serial#Might also be that there was some funny ground loop that killed it since I also had a Raspi hat for a Pi1541 emulator connected at the same time, and the IEC serial is driven by the same chip. It could be that different revs of the C64 have different risks–this was a 250407 board lacking the protection diodes CR100-105 that are present in other designs. Being super cheap I used a $0.99 TTL converter and an RS232-USB adapter that was maybe $3.00 (both from China on eBay). Since everything initially looked good on the scope I don’t know what happened, but maybe there is a lesson in that not all of these RS232/TTL adapters are the same. However, when I then attached the TTL converter to a USB-Serial adapter on my PC, the C64’s CIA at U2 died. I was working pretty methodically using the scope to make sure everything was safe. So I put one together with stuff from my junk bin toady and it looked like everything was cool–had Novaterm running and I could see that everything on the C64/adapter side was working on an oscilloscope (I could see characters being sent when I typed them). I had this same idea to use a cheap TTL-RS232 module to adapt the user port to RS232 on my C64, so I was happy to see this page as a sanity check. This entry was posted in Commodore 64, Retroputing. If it doesn’t, make sure you have a null modem adapter (test it on another machine to confirm) and double check your connections.Īs with any tutorial you find online, be responsible and double check my work and your work before proceeding. You may need to also use a gender changer and/or a 9 pin to 25 pin adapter depending on your modem.įire up CCGMS, Novaterm or Striketerm, set the baud rate to 2400, set the port to the user port and give it a few “AT” commands. Once you’ve got it connected, add the null modem adapter and connect your modem. I used a small bit of CAT5 solid core wire. For GND and RXD you’ll need to jumper two of the pins together on the user port connector. For wire I used female jumper wire that I cut one end off. Observe which side of the user port connector is the top (it’s the one with numbers– letters are on the bottom). I’m providing this warning so you can make your own decision! I’ve had zero problems with mine as listed here. Update! Alwyz from 1200baud suggested that connecting VCC isn’t necessary and potentially dangerous.
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