+---__---+ VSS 1 | | 40 VCC (+5V) N.C. 2 | | 39 TEST 1 ANALOG_B 3 | | 38 ANALOG_A ANALOG_C 4 | | 37 DA0 N.C. 5 | | 36 DA1 N.C. 6 | | 35 DA2 N.C. 7 | | 34 DA3 DA7 8 | | 33 DA4 DA6 9 | | 32 DA5 DA5 10 | KC89C72| 31 GND IOB7 11 | | 30 CLK (Clock In) IOB6 12 | | 29 BC1 IOB5 13 | | 28 BC2 IOB4 14 | | 27 BDIR IOB3 15 | | 26 RESET IOB2 16 | | 25 IOA7 IOB1 17 | | 24 IOA6 IOB0 18 | | 23 IOA5 IOA0 19 | | 22 IOA4 IOA1 20 | | 21 IOA3 +--------+ Use code with caution. Critical Control Bus Lines
: Places the data lines into a high-impedance mode.
) : Directs the chip to treat the data pins (DA0–DA7) as an internal register address. Write Data ( kc89c72 datasheet
Features an 8-bit A/D converter, 16-bit timers, and 8-bit I/O ports for diverse interfacing.
What makes the KC89C72 datasheet truly interesting, however, is what it omits. It does not tell you that this chip, when overclocked, produces a gritty, aliased distortion that modern musicians covet. It does not mention that the envelope generator has a quirk—a hold time that is slightly shorter than the Western original, giving Soviet-made music a unique rhythmic lilt. It provides no history of the factory workers who assembled these chips with outdated lithography machines, breathing microscopic dust that would later be diagnosed as a rare lung disease. +---__---+ VSS 1 | | 40 VCC (+5V) N
: Three independent software-controlled mixers combine the tone outputs and noise generator outputs into three discrete audio streams (Channels A, B, and C).
: Like the original, it includes two 8-bit parallel I/O ports, which were often used in old systems to read joystick inputs or control disk drives. 6 | | 35 DA2 N
For engineers attempting to repair hardware utilizing the KC89C72, the following electrical parameters are critical reference points.