ZOLL PD 2000 - 6 Strip Chart Recorder

SERVICE MANUAL
6. STRIP CHART RECORDER
The strip chart is a General Scanning AR-42. Data are transferred in either
direction on an eight bit bus. Control lines are:
STR_XWR writes data to strip chart
STR_XWRRDY ready to receive data
STR_XRD reads data from strip chart
STR_RDRDY data ready to be read
STR_ERR error has occurred
XSTR_RST resets strip chart
STR_SYNC generates interrupt to CPU
STR_RDBK(0) indicates which status word is available
STR_RDBK(1) indicates which status word is available
The strip chart is controlled by the CPU and receives all its data from the
CPU. The CPU buss is made common to the strip chart through the bi-
directional buss chip U15. The recorder communicates STR_SYNC
(interrupt) and two status bits indicating which of four status bytes is
available direct to the CPU or CPU gate array. The CPU provides a direct
line to reset the strip chart (XST_RST). Read and write signals are
provided only when needed. Three control signals, STR_XWRRDY,
STR_XRDRDY, and STR_ERR are provided when strip chart control latch
U24 is selected by the CPU.
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