110398     LSI-11 Audio Cassette Utility  Version: June 1979
Submitted by: Digital Equipment Corporation
Operating System: Stand-alone  Source Language: MACRO-11  Memory
Required: 512 words RAM or ROM  Hardware Required: Any cassette
recorder/player (or equivalent device) interfaced via a bus interface
(user-supplied).  Keywords: LSI-11, Utilities - Tape
Abstract: The Audio Cassette Utility (ACU) program is designed for
use on LSI-11 systems for loading and saving memory
images of programs and data on audio cassette tapes. The
recorder/player is interfaced to the system via a simple
interface circuit that connects to a DLV11 Serial Line
Unit. Other media (e.g., paper tape) and device
interface hardware can be used with this program as long
as device registers are compatible with the DLV11.
Three ACU commands are provided for reading (loading),
writing (dumping), and verifying (non-memory modifying
read) program tapes in absolute loader format. In
response to operator commands, ACU displays parameters
that the user can change or insert before actually
executing the requested operation.
One additional command effects a continuous series of
alternate 1 and 0 bits to be output as an aid in tuning
or testing audio cassette interface hardware.
All ACU code is PIC allowing the program to be
relocated, starting on any word address. All ACU code
can be loaded in either RAM or ROM; only 512 locations
are required. ACU automatically establishes a four-word
stack at the top of read-write memory, regardless of
system size or location of the ACU program. Two
start/restart addresses are provided, allowing ACU to be
loaded in 512X4 PROMs as used on the MRV11-AA PROM
module. Detailed loading and operating instructions are
included in the ACU User's Guide documentation, (listed
below as "Write-Up and Listing (DA)").
Notes: The binary tape supplied contains position-independent
code and can be loaded at any starting address in RAM or
ROM. Included in the write-up and listing is a LST-11
audio cassette interface. This interface is designed to
connect the DLV11 20 ma I/O to the audio cassette
recorder ear and AUX (or MIC) jacks.
Media (Service Charge Code): Write-Up and Listing (DA), One RX01
Diskette (KA)  Format: RT-11, 600' Magnetic Tape (MA)  Format: RT-11

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Created: December 26, 1998