A DRAM memory replacement using SRAM for Commodore 64 computers that only use two 32KB memory ICs (usually a 4464 or 41464) specifically for board assembly revisions 250466 and 250469. This is not my design but I have some flexibility regarding timing options.

If you have a non-standard glue-logic, you need to let me know. The standard memory replacement will not work if you're using combinations of HCT, AHCT, ALS, etc. It is mostly due to the 74257 chips you have, if they are not LS, you need to let me know. I can build this memory replacement with chips that will work for your system. You just have to tell me what you have in your C64 if you have modified the system for "low power" etc. These are extremely timing-sensitive.

• VSP bug fix
• Power savings