The CTS256A-AL2 is a microcontroller with on-board ROM and RAM. It’s programmed to implement the text-to-speech algorithm. It’s a big 40-pin dip package. It interfaces to external chips through a multiplexed address/data bust (i.e. if ALATCH is active, then address bits will be latched, otherwise the bus containers data bits). There’s also an additional 8 address bits, giving it a 16-bit address space.

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