Mio Operating Variables - Yamaha Mio Service Manual

$D668 RAMSIZE
$D680 DRITYPE
Address Symbol
(HEX) Name
$D6C1 CPRINPG
$D6C3 PRINPG
$D6C5 CPROFFS
$D6C6 PROFFS
$D6C7 BADBUFF
$D6C8 PRIRQ
$D6CA PRPAUSE
$D6CB PCOPYT
$D6CC SPOOLGO
$D6CD XON
$D6FC CURPAGE
$D6FD SMISC
MIO Service Manual
1 Total number of RAM pages (high byte)
64 Configuration data for SASI hard drives
+0: Number cylinders on drive (MSB,LSB)
+2: Numer heads on hard drive
+3: Cylinder to start reduced write current
+5: Precompensation value (usually 0)
+7: ECC burst length (usually $0B)
Table 5-5. MIO Operating Variables
Length Function of operating variable
(Dec)
2 Printer queue character entry pointer.
(memory page number) (LSB,MSB)
2 Printer queue character exit pointer.
(memory page number) (LSB,MSB)
1 Printer queue entry page offset.
1 Printer queue exit page offset.
1 If 255, this indicates that the queue has wrapped, thus
repeat copies are invalid.
1 If 128, then parallel IRQ is enabled. This byte gets copied
to $D6E2 when ROM exited.
1 If 0, then the printer spooler is paused.
1 Number repeat copies to be printed (normally zero unless
they get stacked)
1 Master spooler start/stop flag (255=go)
1 XON/XOFF flag for serial printer handshake. 255=on
0=off.
1 Shadow for $D6E0. Needed for IRQ operation.
1 Shadow for $D6E2. Needed for IRQ operation.
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