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7A42: Difference between revisions
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A 555 timer implements a 15 ms "real-time clock" and watchdog reset, another drives a beeper. | A 555 timer implements a 15 ms "real-time clock" and watchdog reset, another drives a beeper. | ||
An internal jumper enables partial compatibility with a [[7854]] mainframe in storage mode (displaying any single channel, 1+2 in ALT, or 3+4 in ALT only). There are no restrictions with the 7854 in analog mode. | |||
==Pictures== | ==Pictures== | ||