Epson PX-8 User Manual page 123

Entry parameters
Register C = 82H - Alarm set
Register DE = Time descriptor address 10 bytes including message string
address.
Return Parameters
The contents of register pair DE are not changed.
TIMDAT (READ ALARM)
Function: Reads the Time Descriptor into the address required. Note that
the year byte (byte 1) will contain FFH and the seconds byte
(byte 6) contains FH in the lowest nibble (lowest 4 bits). This is
because neither the year nor the Is place of the seconds (i.e. it
can only be set in 10 second intervals) is relevant for alarm
setting.
Entry parameters
Register C = 84H
Register DE = Starting address to load the 11 bytes of the
Time Descriptor
5.7.9 BIOS Subroutines related to the Serial Port
The Serial Port is not supported by the BIOS.
5.7.10 BIOS Subroutines related to memory
The memory of the PX-8 consists of 64K bytes of RAM and 32K of ROM.
By means of bank switching it is possible to read addresses OOOOH to 7FFFH
from either RAM or ROM.
In the following routines when references are made to system bank and user
bank they correspond to addresses as follows:
System bank: OOOOH to 7FFF (ROM)
8000H to FFFF (RAM)
User bank:
OOOOH to FFFF (RAM)
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LOADX is the entry point for the subroutine which reads 1 byte of data from
the specified memory bank.
Entry address: WBOOT
+
5AH
Entry parameters
Register C = - 1 - System bank
C = 0 - User bank
Register HL = Data address
Return Parameter
Register A = Data read
This routine does not change the contents of the other registers.
.. 'IIUD
(Ordinarily, this entry is not used by the user.)
STORX is the entry point for the subroutine which writes 1 byte of data into
the user bank.
Entry Point: WBOOT
+
5DH
Entry parameters
Register C = 0 - User bank
Register A = Data
Register HL= Data address into which data is to be written;
Return Parameters
This routine will not change the contents of the other registers.
.._11;'1
(Ordinarily, this entry is not used by the user.)
LDIRX is the entry point for the subroutine which transfers data from the speci-
fied memory bank to the user bank.
Entry Point: WBOOT
+
60H
Entry parameters
Register HL= Starting address of the memory area from which data is
transferred
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