*Up to 192 KB of RAM and 20 KB of ROM (16 KB on the smallest model) on a 16-bit address bus was implemented using special hardware. As a consequence, certain RAM areas shadowed by ROM could only be used for data storage and the video memory had a green and alternative green bank that could be switched by a hardware register.
*For sound it had a simple (6-bit) DAC. A comparator was included to serve as an ADC (primarily used for reading from tape drives).
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