View source for OSWORD &77

[[Category:OSWORD]]
OSWORD &77 (119) - Perform sector access to RamFS

==Specification==
{| cellpadding="0" cellspacing="0" 
| || align="left" | '''On entry:''' || align="left" | '''On exit:'''
|-
| colspan="3" | '''Control block'''
|- align="left" valign="top"
| align="center" | XY?&00   || Drive                    || 
|- align="left" valign="top"
| align="center" | XY!&01   || Data address             || 
|- align="left" valign="top"
| align="center" | XY?&05   || Command                  || 
|- align="left" valign="top"
| align="center" | XY?&06   || Number of parameters (n) || 
|- align="left" valign="top"
| align="center" | XY+7...  || Parameters               || 
|- align="left" valign="top"
| align="center" | XY?(7+n) ||                          || Result
|}

No contents of the control block should be relied upon on exit other than
the result byte. Some systems update the control block, some systems do not.

This call takes and returns exactly the same parameters and results as
[[OSWORD &7F]] but accesses RAMFS. If the specified drive is not present
then a result of &1E (not present) is returned. If the command is not
supported, then a result of &?? (bad command) is returned.