Maintenance
1705A Spectrum Monitor 6-5
selected by moving the cursor to a point adjacent to t he test name and pushing
the INPUT push button.
USE SPANKEYS TO MOVE CURSOR,
PRESS INPUT KEY TO SELE CT
TEST
MEMORY
>DAC
LED
KEY
EXIT
Figure6 -2: 1705A Testmenu, displayed when Test is the Main menu selection
The NOVRAM (Non VolatileRandom Access Memory) test is s elected from the
crt-displayedTest menu by pushing the VIDEO push button. When this test is
selected, the crtfirst displays a message that gives the memory version and
copyright dates.
The test then proceeds to check the NOVRAM and the Electrically Eraseable
ProgrammableMemory (EEPROM). The test goes through three steps, each
with its own message displayedon the crt starting with:
NONVOLATILE<2444> RAM TEST
Its first actionis to write to and read out of memory; during this step there is a
message that the microprocessoris:
WRITING AND READING 2444
This test checksthat all lines and the NOVRAM are operating correctly. Ifthe
microprocessorcan not establish Read and Write communications with the
NOVRAM (U812), the following message will be displayed on the crt:
ERROR : CANNOT WRITE TO 2444
Memory Test