169 lines
10 KiB
Markdown
169 lines
10 KiB
Markdown
# New features
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Here are the features of the Open ROMs not found in the original ROMs from the 80s (many of them are [configurable](CONFIG.md)):
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* improved keyboard scanning, supports multi-key roll-over and rejection of spurious joystick input
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* joystick (port 1) can be used to move text cursor
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* uses RAM under ROM and I/O: 61438 bytes free
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* cold/warm start silences multiple SID chips - all $D4xx and $D5xx addresses
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* wark start due to BRK prints out the instruction address
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* extended `LOAD` command
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* start/end addresses are displayed, in the Final cartridge style
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* command with just the file name tries to use the last device if it's number seems sane; otherwise uses 8
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* secondary address over 255 is considered a start address
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* DOS wedge (direct mode only) - `@<drive_number>`, `@<command>`, `@$`, `@$<params>`, `@`
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NOTE: extra features and their syntax can change in the future!
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# Features missing
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The following ROM features are currently missing:
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* most BASIC commands
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* BASIC variables
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* BASIC expression parsing
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* floating point routines
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* tape support
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* RS-232 support
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* breaking Kernal routines with RUN/STOP key
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* NMI handling is incomplete
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# API status
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Status of the various APIs and variables from the original ROMs
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## Low memory locations (pages 0 - 3)
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For the current status of the low memory location implementation andd usage check [this file](c64/aliases/,aliases_ram_lowmem.s). NOTE: available vector to certain routine does not mean that this routine is fully implemented!
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## BASIC
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### Official BASIC routines
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Note: vectors at `$0300` are not supported yet - for now only the locations below can be used!
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<br />
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| Entry | Unofficial | Name | Status | Remarks |
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| :-------: | :--------: | :--------- | :------: | :------------------------------------------------: |
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| `($0003)` | | `ADRAY1` | NOT DONE | |
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| `($0005)` | | `ADRAY2` | NOT DONE | |
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| `(00300)` | `$E38B` | `ERROR` | NOT DONE | |
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| `(00302)` | `$A483` | `MAIN` | NOT DONE | some implementation exists, but not connected here |
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| `(00304)` | `$A57C` | `CHRNCH` | NOT DONE | |
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| `(00306)` | `$A71A` | `QPLOP` | NOT DONE | some implementation exists, but not connected here |
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| `(00308)` | `$A7E4` | `GONE` | NOT DONE | some implementation exists, but not connected here |
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| `(0030A)` | `$AE86` | `EVAL` | NOT DONE | some implementation exists, but not connected here |
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| `($A000)` | `$E394` | cold start | PARTIAL | |
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| `($A002)` | | warm start | PARTIAL | |
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<br />
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### Unofficial BASIC routines/locations
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Not all of them - only these we want to have implemented.
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<br />
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| Address | Name | Status | Remarks |
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| :-------: | :----------- | :------: | :------------------------------------------------: |
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| `$A004` | revision str | DONE | |
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| `$A533` | LINKPRG | DONE | |
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| `$A659` | set txt ptr | NOT DONE | |
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| `$A68E` | RUNC | DONE | |
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| `$A7AE` | NEWSTT | PARTIAL | redirected to RUN command |
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| `$AB1E` | STROUT | DONE | |
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| `$BDCD` | LINPRT | DONE | temporary implementation |
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| `$E3BF` | INIT | NOT DONE | |
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| `$E422` | INITMSG | DONE | |
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| `$E453` | RVECT | NOT DONE | |
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<br />
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## Kernal
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### Official Kernal routines
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NOTE: Even the 'DONE' routines won't support features described as missing in one of the previous chapters!
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<br />
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| Address | Unofficial | Name | Status | Remarks |
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| :-------: | :--------: | :---------- | :------: | :--------------------------------------------------: |
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| `($028F)` | | `KEYLOG` | DONE | works differently on purpose, to improve kb scanning |
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| `$FF81` | `$FF5B` | `CINT` | DONE | |
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| `$FF84` | `$FDA3` | `IOINIT` | PARTIAL | CIA initialization incomplete |
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| `$FF87` | `$FD50` | `RAMTAS` | DONE | |
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| `$FF8A` | `$FD15` | `RESTOR` | DONE | |
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| `$FF8D` | `$FD1A` | `VECTOR` | DONE | |
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| `$FF90` | | `SETMSG` | DONE | |
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| `$FF93` | | `SECOND` | DONE | |
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| `$FF96` | | `TKSA` | DONE | |
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| `$FF99` | | `MEMTOP` | DONE | |
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| `$FF9C` | | `MEMBOT` | DONE | |
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| `$FF9F` | | `SCNKEY` | PARTIAL | future complete version has compatibility problems |
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| `$FFA2` | | `SETTMO` | DONE | |
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| `$FFA5` | | `ACPTR` | DONE | |
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| `$FFA8` | | `CIOUT` | DONE | |
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| `$FFAB` | | `UNTLK` | DONE | |
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| `$FFAE` | | `UNLSN` | DONE | |
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| `$FFB1` | | `LISTEN` | DONE | |
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| `$FFB4` | | `TALK` | DONE | |
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| `$FFB7` | | `READST` | DONE | |
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| `$FFBA` | | `SETFLS` | DONE | |
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| `$FFBD` | | `SETNAM` | DONE | |
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| `$FFC0` | `$F34A` | `OPEN` | DONE | |
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| `$FFC3` | `$F291` | `CLOSE` | DONE | |
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| `$FFC6` | `$F20E` | `CHKIN` | DONE | |
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| `$FFC9` | `$F250` | `CKOUT` | PARTIAL | |
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| `$FFCC` | `$F333` | `CLRCHN` | DONE | |
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| `$FFCF` | `$F157` | `CHRIN` | PARTIAL | |
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| `$FFD2` | `$F1CA` | `CHROUT` | PARTIAL | |
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| `$FFD5` | `$F49E` | `LOAD` | PARTIAL | not yet clear what's this entry doing |
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| `($0330)` | `$F4A5` | `LOAD` | PARTIAL | no VERIFY support, no STOP key, check $F49E addr |
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| `$FFD8` | `$F5DD` | `SAVE` | NOT DONE | |
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| `($0332)` | `$F5ED` | `SAVE` | NOT DONE | |
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| `$FFDB` | | `SETTIM` | DONE | |
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| `$FFDE` | | `RDTIM` | DONE | |
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| `$FFE1` | `$F6ED` | `STOP` | DONE | |
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| `$FFE4` | `$F13E` | `GETIN` | PARTIAL | only some devices supported |
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| `$FFE7` | `$F32F` | `CLALL` | DONE | |
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| `$FFEA` | | `UDTIM` | DONE | |
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| `$FFED` | | `SCREEN` | DONE | |
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| `$FFF0` | `$E50A` | `PLOT` | DONE | |
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| `$FFF3` | | `IOBASE` | DONE | |
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| `($FFFA)` | | NMI vec | PARTIAL | |
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| `($FFFC)` | | RESET vec | PARTIAL | |
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| `($FFFE)` | | IRQ/BRK vec | PARTIAL | |
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<br />
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### Unofficial Kernal routines/locations
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Not all of them - only these we want to have implemented.
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<br />
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| Address | Name | Status | Remarks |
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| :-------: | :------------------ | :------: | :------------------------------------------------: |
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| `$E544` | clear screen | DONE | |
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| `$E50C` | set cursor position | PARTIAL | |
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| `$E5A0` | setup VIC II & IO | PARTIAL | |
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| `$EA31` | default IRQ | PARTIAL | |
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| `$EA7E` | ack CIA1 + below | DONE | |
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| `$EA81` | ret from IRQ/NMI | DONE | |
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| `$FD30` | default vectors | DONE | |
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| `$FE47` | default NMI | PARTIAL | |
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| `$FE66` | default BRK | DONE | |
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| `$FF80` | revision byte | DONE | |
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