New features

Here are the features of the Open ROMs not found in the original ROMs from the 80s (many of them are configurable):

improved keyboard scanning, supports multi-key roll-over and rejection of spurious joystick input
joystick (port 1) can be used to move text cursor
uses RAM under ROM and I/O: 61436 bytes free
cold/warm start silences multiple SID chips - all $D4xx and $D5xx addresses
wark start due to BRK prints out the instruction address
extended LOAD command
- start/end addresses are displayed, in the Final cartridge style
- command with just the file name tries to use the last device if it's number seems sane; otherwise uses 8
- secondary address over 255 is considered a start address
DOS wedge (direct mode only) - @<drive_number>, @<command>, @$, @$<params>, @

NOTE: extra features and their syntax can change in the future!

Features missing

The following ROM features are currently missing:

most BASIC commands
BASIC variables
BASIC expression parsing
floating point routines
tape support
RS-232 support
breaking Kernal routines with RUN/STOP key
NMI andling is incomplete

API status

Status of the various APIs and variables from the original ROMs

Low memory locations (pages 0 - 3)

For the current status of the low memory location implementation andd usage check this file. NOTE: available vector to certain routine does not mean that this routine is fully implemented!

BASIC

TODO

Kernal

Note: only the jump table addresses are currently supported, real routine addresses are different!

Official Kernal routines

NOTE: Even the 'DONE' routines won't support features described as missing in one of the previous chapters!

Address	Name	Status	Remarks
`$FF81`	`CINT`	DONE
`$FF84`	`IOINIT`	PARTIAL	CIA initialization incomplete
`$FF87`	`RAMTAS`	DONE
`$FF8A`	`RESTOR`	DONE
`$FF8D`	`VECTOR`	DONE
`$FF90`	`SETMSG`	DONE
`$FF93`	`SECOND`	DONE
`$FF96`	`TKSA`	DONE
`$FF99`	`MEMTOP`	DONE
`$FF9C`	`MEMBOT`	DONE
`$FF9F`	`SCNKEY`	DONE	could be better integrated with ROM (aliases)
`$FFA2`	`SETTMO`	DONE
`$FFA5`	`ACPTR`	DONE
`$FFA8`	`CIOUT`	DONE
`$FFAB`	`UNTLK`	DONE
`$FFAE`	`UNLSN`	DONE
`$FFB1`	`LISTEN`	DONE
`$FFB4`	`TALK`	DONE
`$FFB7`	`READST`	DONE
`$FFBA`	`SETFLS`	DONE
`$FFBD`	`SETNAM`	DONE
`$FFC0`	`OPEN`	DONE
`$FFC3`	`CLOSE`	DONE
`$FFC6`	`CHKIN`	DONE
`$FFC9`	`CHKOUT`	PARTIAL
`$FFCC`	`CLRCHN`	DONE
`$FFCF`	`CHRIN`	PARTIAL
`$FFD2`	`CHROUT`	PARTIAL
`$FFD5`	`LOAD`	PARTIAL	no VERIFY support yet, no STOP key support
`$FFD8`	`SAVE`	NOT DONE
`$FFDB`	`SETTIM`	DONE
`$FFDE`	`RDTIM`	DONE
`$FFE1`	`STOP`	DONE
`$FFE4`	`GETIN`	PARTIAL	only some devices supported
`$FFE7`	`CLALL`	DONE
`$FFEA`	`UDTIM`	DONE
`$FFED`	`SCREEN`	DONE
`$FFF0`	`PLOT`	PARTIAL	cursor blink not handled
`$FFF3`	`IOBASE`	DONE

Unofficial Kernal locations