I made a Ram expander for my Apple-1 replica. It has a 4K ROM with BASIC burned in and 32K static RAM, 2000h to 9FFFh address space. Memory addressing is performed by a properly programmed 74S188 PROM enabled by a NAND gate. The original 8K dram is set to 000h - 1FFFh.The expander works perfectly, currently the final PCB is in production.I'm going to make a demo video on Youtube where I'll post the documentation, along with the ROM and PROM content to burn. It may also be available for sale.
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Always good to see folks with new developments for the old hardware. Looking forward to it.
I look forward to your video.
Any thoughts on price point?
I did not think about the exact price, because my goal is not to make money. But it can be around $ 60- $ 70. The documentation will be public so you can do it yourself ...
https://www.youtube.com/watch?v=DpyRFtjFqnQ&feature=youtu.be