5.3 KiB
5.3 KiB
New features
Here are the features of the Open ROMs not found in the original ROMs from the 80s:
- 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 4 SID chips - assumes addresses $D400, $D420, $D440, $D460
- extended
LOADcommand- start/end addresses are displayed, in the Final cartridge style
- command with just the file name tries to use the last device if it's number seems sane; otherwise uses 8
- secondary address over 255 is considered a start address
- DOS wedge (direct mode only) -
@<drive_number>,@<command>,@$,@$<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
- BRK handling; NMI/IRQ handling is incomplete
Features currently being worked on:
- IEC support needs more work; alternative drive ROMs (JiffyDOS, DolphinDOS, etc) usually don't work with current implementation, SAVE / VERIFY are not implemented, etc.
API status
Status of the various APIs and variables from the original ROMs
Page 0
TODO
Pages 2 & 3
TODO
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 |
NOT DONE | |
$FFDE |
RDTIM |
NOT DONE | |
$FFE1 |
STOP |
DONE | |
$FFE4 |
GETIN |
PARTIAL | only some devices supported |
$FFE7 |
CLALL |
DONE | |
$FFEA |
UDTIM |
NOT DONE | checking for STOP key present in SCNKEY instead |
$FFED |
SCREEN |
DONE | |
$FFF0 |
PLOT |
NOT DONE | |
$FFF3 |
IOBASE |
DONE |
Unofficial Kernal locations
TODO