Ben Grimmett's SD Loader and 128K RAM Expansion

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Ben Grimmett joined our VZ200 Facebook group and offered to make an SD Loader. The final product included 128K RAM and SD card load and save capability for SD cards 2GB and larger.

The product was available at https://bennvenn.myshopify.com/products/vz300-sd-loader?variant=31028143456359 but is currently sold out.

The design uses an Altera Max II CPLD for addressing and other logic, a couple of 16 bit transceivers, a 128K RAM chip and a 27C64A EPROM.

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