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DECODE SYSTEMS
Many public safety and service agencies are converting their radios to trunking systems. Although Uniden is marketing their TrunkTracker, a number of enterprising computer enthusiasts are using specialized software to decode the trunking messages transmitted between mobile handsets and base stations. RCA COS/MAC MICROPROCESSOR TRAINERS The RCA CDP1802 COSMAC microprocessor is a one-chip CMOS 8-bit register-oriented central processing unit introduced in 1976. Although the 1802 is now more than 30 years old, it continues to prove itself in many industrial and commercial applications.COMPUTER RESCUE
Location: (Primary) Maryland, midway between Baltimore and Washington, D.C. (Alternate 1) Illinois, Chicago area (Alternate 2) Michigan,Grand Rapids area
HEATHKIT ET-3400 MICROPROCESSOR TRAINER The following are titles and excerpts from manuals related to the ET-3400: 595-2021 (-05), Heathkit Manual for the Microprocessor Trainer Model ET-3400, 1977 The ET-3400 Microcomputer Learning System is a practical, low cost microprocessor trainer; designed as a learning tool to teach microprocessor operation, programming, andapplications.
OLD DISPLAYS
This is a nine-digit LED display with a part number of OND P19. It has 19 connectors along the bottom, apparently designed to be plugged intoa larger device.
CLOCK INTEGRATED CIRCUITS Clock circuit using LED displays, powered via AC or DC. When AC power fails, MCD-2 optoisolator senses voltage drop and makes Schmitt trigger force strobe input of clock chip to ground, blanking display and reducing current drain from 200 mA on AC to 12 mA on 9 voltstandby battery.
HEATHKIT CLOCKS
Time is kept from a Mostek MK5017 PAA integrated circuit.The 5017 had several variants (MK5017AA, MK5017P and MK5017A) but was always a 24-pin dual-inline package (DIP). It was Heathkit part number 443-601.OLD SEMICONDUCTORS
This is a Texas Instruments SN76477N complex sound generator sold by Radio Shack as catalog number 276-1765. I had two of these, still in the package - they were traded for some other interesting old items. DIAGNOSTIC INTERFACE FROM THE MOVIE _RED PLANET_ The 2000 Warner Brothers film Red Planet featured a Russian sample-and-return spacecraft as an integral plot device. Although improbable that such an automated probe would have a built-in diagnostic terminal as pictured below, the user interface has some interesting design elements: 0.5 ” NUMERIC LED DISPLAY E. LD50X2-11 F. LE50X2-11 G. LN50X3-12 Absolute Maximum Ratings at T A =25 °C REVERSE VOLTAGE PER LED CHIP (Details
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