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DM504A: Difference between revisions
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==Internals== | ==Internals== | ||
The DM504A has no rear interface I/O. | The DM504A has no rear interface I/O. | ||
The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and | The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and a 1N827 temperature-compensated zener reference. There is a 93C46 EEPROM (cal constants?) | ||
The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 V<sub>AC</sub> windings. | The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 V<sub>AC</sub> windings. | ||