8870 Adventures

© Joe Farr, 2011 – 2024

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  • TC550 Memory Datasheet

    The TC550 is a 256 word by 4 bit memory and two of these memories are usually found inside a DAP4 CPU board 1528-xx. They are extremely low power CMOS memories and as such are used as NVR (None-Volatile RAM) by the CPU board to store user changeable configuration data.

  • LFI List

    Everything in a Nixdorf machine has an LFI plate stamped or stuck on it; basically a unique part number. This list will give the main LFI numbers for 8870/Quattro machines and those for any other machines I’ve discovered. 1526-xx 8890 DAP4 VDU CPU Processor 16K RAM 1528-01 8870 DAP4 VDU CPU Processor 16K RAM 1528-03…

  • AY-3-1015 Datasheet

    The AY-3-1015 is a Universal Asynchronous Receiver/Transceiver IC (UART) and controls the data communication between the ALME channel and the connected device. 1882-00 and 1882-01 ALME

  • MC14411 Datasheet

    The MC14411 is a bit rate generator IC and is used as the master clock rate generator within the 1882-00 and 1882-01 ALME

  • 2114 Datasheet

    The 2114 SRAM (Static Random Access Memory) chip is a 1024 word x 4 bit memory. Four of these memories are found inside the DAP4 CPU boards (1528-xx) configured as 2Kb x 8 bits and used for the video display buffer. SRAM is useful as it doesn’t require a constant refresh signal from the CPU,…

  • When the Logfile is full

    At some point the system logbook or logfile is going to fill up and need to be printed. Some operating system version offer a reset logfile program, usually available on the Manager or System selectors, but it’s not available on all operating system versions, and unless you are running your system in a live environment,…