Schach RAM

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Schach RAM is a two-kilobyte block of extra RAM used in cartridge #20, Schach (Chess) for the Saba Videoplay. This consists of four 2114 chips (1K x 4 bits), and it starts at memory location $2800, and ends at $2FFF. This RAM is different than using the registers or VRAM, because it can be access directly in memory using the data counter.

Since most homebrew development carts are made from Schach cartridges, and MESS emulates it, modern homebrews can safely use it.