The Programmer's Guide to TRSDOS Version 6 - Tim Mann's Home ...

7.6.40 @HEX8 SVC-98
This SVC will convert a 1-byte number to hex ASCII.
Registers Affected: AF, HL.
Entry:
C Contains the value to convert.
HL A pointer to your 2-character buffer.
Exit:
HL Will point to end-of-buffer + 1.
7.6.41 @HEXDEC SVC-97
This SVC converts a 16-bit binary number into decimal ASCII.
Registers Affected: AF, BC, HL.
Entry:
HL Contains the value to convert.
DE A pointer to your 5-character buffer.
Exit:
DE Will point to end-of-buffer + 1.
7.6.42 @HIGH$ SVC-100
This SVC will alter or return the current value of HIGH$/LOW$. Note that neither can be
altered if bit-0 of the CFLAG$ is set. HIGH$ is a word containing the highest RAM address
usable by the system. User modules that need be protected from being overwritten are
placed in high memory. The module's last address should occupy the current HIGH$ and
HIGH$ is then lowered to correspond to the memory location just prior to the module. LOW$
needs to be set by those programs using @CMNDR that want to protect memory starting from
their lowest address (LOW$ defaults to X'2FFF').
Registers Affected: AF [HL if originally set to 0].
Entry:
B 0, SVC deals with HIGH$
B 1, SVC deals with LOW$
HL If a non-zero value is contained in HL, then HIGH$/LOW$ is changed the that
value. If HL contains a zero value, then the current value of HIGH$/LOW$ is
returned.
7.6.43 @INIT SVC-58
INIT will open an existing file. If the file is not found, it will be created according
to the file specification.
Registers Affected: AF.
Entry:
HL The 256-byte disk I/O buffer to be used during I/O.
DE File Control Block containing the file specification.
B Logical Record Length to be used while the file is open.
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