If your MEGA65 was manufactured before 2024, then choose
C64MEGA65-V5.1-R3.cor otherwise choose C64MEGA65-V5.1-R6.cor.
We are supporting these MEGA65 models: R3/R3A, R4, R5 and R6. Use
the following table to ensure that you select and flash the correct .cor
from the ZIP file.
| MEGA65 model | Years | File name | Comment |
|---|---|---|---|
| R2 | 2019-2020 | <none> | R2 is a very rare pre-series model, only 20 of them were built. The C64 for MEGA65 core does not run on R2 machines. |
| R3/R3A | 2020-2023 | C64MEGA65-V5.1-R3.cor | R3 is the "DevKit" (100 were built) and R3A are batches 1 and 2. If your MEGA65 was manufactured before 2024 then you have an R3 or R3A machine. |
| R4 | 2023 | C64MEGA65-V5.1-R4.cor | Development board on our way to the R6. Only 10 of them were manufactured (board only, no complete machines). |
| R5 | 2023 | C64MEGA65-V5.1-R5.cor | Upgraded version of R4 that contains new circuits for the expansion port. Only 10 of them were manufactured (board only, no complete machines). |
| R6 | 2024+ | C64MEGA65-V5.1-R6.cor | Latest and greatest MEGA65. Manufactured from 2024 on. |
Navigate to the MEGA65 Filehost and read this article, if you are interested in more details about the MEGA65 model history. Also contains technicals specifications and photos.
Only use *.bit files if you know what you are doing.
| Number | Topic | Details | R3/R3A | R4 | R5 | R6 |
|---|---|---|---|---|---|---|
| 1 | Bug: HDMI backpower issues | Learn more, what wide range of problems and strange effects HDMI backpower issues are creating and how to avoid these issues. | yes | no | no | no |
| 2 | DAC for analog 3.5mm audio jack | While on R3/R3A machines the analog audio that comes out from the 3.5mm audio jack is "OK" and sometimes is plagued by hissing and humming, the newer machines feature a high-quality audio digital to analog converter (DAC) that leads to a crystal clear output. | standard | DAC | DAC | DAC |
| 3 | Hardware cartridges: Bi-directional reset signal | Makes the core compatible with even more cartridges. Two examples that stand out are: (1) You do not need the "reset workaround" for the Kung Fu Flash (KFF) any more (2) Reset buttons and "special" buttons at most freezer cartridges are working now. | no | no | yes | yes |
| 4 | Supercapacitor for Real-Time-Clock (RTC) | Ensures that the MEGA65 remembers the date/time even if you did not install a CR2032 battery. | no | yes | yes | yes |
| 5 | Bug: Limited ability to pull Expansion Port's RESET to GND | R5 boards contain a bug that reduces compatibility as described here: #118. Can be fixed by "modding" the board. Needs some soldering skills. | no | no | yes | no |