Read bytes from a file into memory
Function AddressDescription
DOS_WRITE 0115Write bytes from memory into a file


Write bytes from memory into a file, advancing the file pointer in the process.

Entry Parameters

Register Content
B File number 0…15
C Page number for addresses 0xC000…0xFFFF
DE Number of bytes to write. 0 means 64K
HL Address of where to read the bytes from

Exit Parameters

If OK:
Carry true
A corrupt
DE corrupt
Carry false
A = Error code
DE = Number of bytes remaining unwritten
BC HL IX corrupt, all other registers preserved.

The value of C is only used when HL is within the upper 16K of memory (0xC000…0xFFFF). If HL is in this range then C is the RAM bank to use. For most purposes C should be set to 0 which is the default RAM bank mapped to that region.

Last modified November 24, 2021: Start of +3DOS documentation (253d8cc)