Sharp mz-3500 Manual For Use page 289

Section B: Hardware interface
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15 - Check Printer State
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On entry:
On exit : AL = 0 or 0FFH
If all output devices mapped via the LSTOUT: vector to the printer are
ready to receive a character, A and L are set to 0FFH, otherwise 0.
Example:
LD C,50 EOS function code
LD
DE,PARAMS Parameters
CALL 5 Call EOS to execute function
OR A
Test result
JP NZ, PRINT Non-zero means ready
PARAMS: DB
15
Hardware function No.
DB
0
ow
0
DW 0
ow
0
EOS System manual Daeumling & Zimmermann
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