New features

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

improved keyboard scanning, resistant to ghosting and joystick interference (one variant even supports multi-keyy rollover), supports additional C128 keys
joystick can be used to move text cursor
pre-defined function keys
uses RAM under ROM and I/O: 61438 bytes free
cold/warm start silences multiple SID chips - all $D4xx and $D5xx addresses, configured addresses
wark start due to BRK prints out the instruction address
extended LOAD command
- start/end addresses are displayed, in the Final cartridge style
- command with just the file name tries to use the last device if it's number seems sane; otherwise uses 8
- secondary address over 255 is considered a start address
turbo tape load support (as device 7 or using ←L)
DOS wedge (direct mode only) - @<drive_number>, @<command>, @$, @$<params>, @

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

Features missing

The following ROM features are currently missing and are not planned due to space considerations:

full tape support - VERIFY, SAVE, sequential files; tape is considered a legacy medium, so it's support is going to be limited
mock 6551 emulation - this only complicates the RS-232 support for original ROMs, probably noone needs it

The following ROM features are currently missing:

most BASIC commands
BASIC variables
BASIC expression parsing
floating point routines
tape (normal mode) support
RS-232 support
NMI handling 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

Official BASIC routines

Entry	Unofficial	Name	Status	Remarks
`($0003)`		`ADRAY1`	NOT DONE
`($0005)`		`ADRAY2`	NOT DONE
`(00300)`	`$E38B`	`ERROR`	NOT DONE
`(00302)`	`$A483`	`MAIN`	NOT DONE	some implementation exists, but not connected here
`(00304)`	`$A57C`	`CHRNCH`	NOT DONE
`(00306)`	`$A71A`	`QPLOP`	NOT DONE	some implementation exists, but not connected here
`(00308)`	`$A7E4`	`GONE`	NOT DONE	some implementation exists, but not connected here
`(0030A)`	`$AE86`	`EVAL`	NOT DONE	some implementation exists, but not connected here
`($A000)`	`$E394`	cold start	PARTIAL
`($A002)`	`$E3B7`	warm start	PARTIAL

Unofficial BASIC routines/locations

Not all of them - only these we want to have implemented.

Address	Name	Status	Remarks
`$A004`	revision str	DONE
`$A408`	REASON	NOT DONE
`$A453`	(unknown)	NOT DONE
`$A533`	LINKPRG	DONE
`$A644`	new	NOT DONE
`$A659`	set txt ptr	NOT DONE
`$A68E`	RUNC	DONE
`$A7AE`	NEWSTT	PARTIAL	redirected to RUN command
`$AB1E`	STROUT	DONE
`$AD9E`	FRMEVL	NOT DONE
`$BDCD`	LINPRT	DONE	temporary implementation
`$E3BF`	INIT	NOT DONE
`$E422`	INITMSG	DONE
`$E453`	RVECT	NOT DONE

Kernal

Official Kernal routines

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

Address	Unofficial	Name	Status	Remarks
`($028F)`		`KEYLOG`	DONE
`$FF81`	`$FF5B`	`CINT`	DONE
`$FF84`	`$FDA3`	`IOINIT`	PARTIAL	CIA initialization incomplete
`$FF87`	`$FD50`	`RAMTAS`	DONE
`$FF8A`	`$FD15`	`RESTOR`	DONE
`$FF8D`	`$FD1A`	`VECTOR`	DONE
`$FF90`		`SETMSG`	DONE
`$FF93`		`SECOND`	DONE
`$FF96`		`TKSA`	DONE
`$FF99`	`$FE25`	`MEMTOP`	DONE
`$FF9C`		`MEMBOT`	DONE
`$FF9F`		`SCNKEY`	DONE
`$FFA2`		`SETTMO`	DONE
`$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
`$FFC0`	`$F34A`	`OPEN`	DONE
`$FFC3`	`$F291`	`CLOSE`	DONE
`$FFC6`	`$F20E`	`CHKIN`	DONE
`$FFC9`	`$F250`	`CKOUT`	DONE
`$FFCC`	`$F333`	`CLRCHN`	DONE
`$FFCF`	`$F157`	`CHRIN`	PARTIAL	no screen support, keyboard does not preserve .Y
`$FFD2`	`$F1CA`	`CHROUT`	DONE
`$FFD5`	`$F49E`	`LOAD`	DONE
`($0330)`	`$F4A5`	`LOAD`	DONE
`$FFD8`	`$F5DD`	`SAVE`	DONE
`($0332)`	`$F5ED`	`SAVE`	DONE
`$FFDB`		`SETTIM`	DONE
`$FFDE`		`RDTIM`	DONE
`$FFE1`	`$F6ED`	`STOP`	DONE
`$FFE4`	`$F13E`	`GETIN`	PARTIAL	no screen device support
`$FFE7`	`$F32F`	`CLALL`	DONE
`$FFEA`		`UDTIM`	DONE
`$FFED`		`SCREEN`	DONE
`$FFF0`	`$E50A`	`PLOT`	DONE
`$FFF3`		`IOBASE`	DONE
`($FFFA)`		NMI vec	PARTIAL
`($FFFC)`	`$FCE2`	RESET vec	PARTIAL	see IOINIT status
`($FFFE)`		IRQ/BRK vec	DONE

Unofficial Kernal routines/locations