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- Commodore 64 Emulator Version 0.1 Readme
- (C) 1993-4 Earle F. Philhower III (st916w9r@dunx1.ocs.drexel.edu)
- You MUST own a Commodore 64 to use this program, as it contains
- the Commodore 64 ROMs, which are (C)CBM Corp., within its code.
-
- You should also have recieved this package with a file called
- "COPYING" which contains the GPL license which it is distributed under.
-
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ----- 0.1 README -----
- Read the 0.1 Beta section below first...
- Updates/Bug Fixes:
- Only a 68000 version supplied. The 020 version wasn't any faster. :<
- Improved Keyboard Mapping:
- DELETE = C64 delete
- ESC = RUN/STOP
- ` = RUN/STOP-RESTORE
- When in emulation mode, COMMAND-<key> is in effect, and you
- can now bring up menus w/o stopping the emulation.
- When placed into the background, emulation is automagically suspended.
- No longer hogs 100% of CPU time when emulating (for updates/network.etc)
- Window is snapped onto a BYTE grid horizontally for faster BITBLITS
- When an unimplemented instruction is encountered, only the C64 will
- crash, and not the whole MacOS (I was taking the emulation a bit too
- far ;-> )
- Hi-Res mode now works properly, and won't crash MacOS.
- Printer Support:
- Device #4 (CBM Printer) is directed to a Mac file called "PRINTER"
- in the directory the program is run from. This will be changed
- in a later release.
- Doesn't hog CPU when displaying ABOUT box.
- BRK instruction now jumps to the IRQ address, as it should!
- Unfixed Bugs/Unimplemented Features:
- ***The whole FILE and EDIT menus are just there for looks***
- ***I haven't written or debugged the code to do those functions***
- Hard Drive (#9) support seems to be flakey, and there are no $ or *
- support yet.
- 1541 (#8) still uses c1541 disk images. This WILL change to .D64
- images (not a big change, but will allow the use of all of the IBM
- transferred software (!!!) on the emulator)
- Typing a key 2 times in a row looks to the computer as if you had
- held the key down for 2x as long, not hitting the key 2x.
- Double-Clicking on a 1541 image starts the emulator, but I haven't
- added Apple Event support to load that image. Coming RSN!
- Keyboard is not fully mapped from MAC -> C64. This includes some
- CTL and all COMMODORE key combos.
- I'm looking into a pixel-doubling algorithm to make the VIC screen
- 2x normal size, so all you rich people with real Macs can run
- the emulator w/o eyestrain. ;->
- Possibly mapping in CHARROM to the processor space (via addr. 1) may
- do bad things. I haven't tested this yet.
- Undocumented opcodes aren't implemented yet. This too will change.
- SPEED SPEED SPEED SPEED:
- I have received the 68K source for a 6502 emulator from
- Pieter van Leuven, who has a Vic-20 emulator available for the Ami.
- I've looked at it, and I think I could either hack his, or write my
- own code w/o too much effort.
- Documentation:
- This documentation sucks. If you check the time on this file you will
- see that I am writing it at 12:20am on a Monday morning/Sunday nite.
- I'm not really keen on writing a lot of docs on a program that's
- being revamped every two weeks, so this README is all you're gonna
- get, spelling and grammar errors et. al!
- *****
- My email addresses:
- ephilhow@motown.ge.com: Will be valid until Mar 30, 1994.
- st916w9r@dunx1.ocs.drexel.edu: Valid until 1996.
- If you've got to get in touch with me, use the .ge.com address until Mar 30,
- but after that date I'll be using the .drexel.edu address.
-
- ----- 0.1 Beta README -----
- This is a *preliminary* version of my Commodore 64 emulator. This release
- is more of a "hacker's release" than a "end-user" one. Not all of the
- routines are bullet-proof, or even implemented :).
-
-
- To run the 64 emulator:
- If you have a 68000 series Macintosh (Classic, SE, Plus) run:
- Commodore 64-000
- If you have a 68020+ series Macintosh run:
- Commodore 64-020
-
- You'll be presented with a splash screen identifying the (C) and GPL,
- and then the Commodore 64 window will be brought up and run. Just type
- and fool around in your *very expensive* C64!
-
- The emulator has support for c1541 (x64) type floppy disk images. To
- attach a floppy to drive#8 simply use the "Devices" menu and select
- either "Select Floppy Image" or "Create Floppy Image" to create a blank,
- formatted 1541 image. After attaching an image, just do your usual
- LOAD "$",8; OPEN 1,8,0,"FILE,S"; etc.
-
- Also supported is a "hard drive" interface to your Macintosh HD. It is
- accessed via device #9 and *only* supports LOAD/SAVE/OPEN/PRINT# commands.
- No directory support is provided (LOAD"$",9 gives a "File Not Found" error")
-
- No joystick or paddle support is available yet, and the printer support
- is not nearly usable. There is no SID chip simulation, this may be done
- in the near future. ***There is no, and will not be, color support for
- the VIC chip unless someone else can program it as I only have a Mac
- Classic to work with.*** But if someone wants to donate an old LC or
- Mac II I'd be more than happy to reprogram my simulation ;>.
-
- The VIC chip doesn't have sprite/sprite or sprite/char collisions, but
- these would not be too hard to implement using my present code. VIC
- raster interrupts *are* simulated, but the screen is only updated by the
- full 200 lines, so split-screen gfx don't work well at all.
-
- ------------
- "Commodore 64 Emulator...
- It's not much, but it's the *only* Commodore 64 you can run on your Mac!"
-
- Any user suggestions, bug-fixes, updates please email to the above address
- (st916w9r@dunx1.ocs.drexel.edu). I'm especially interested in any 68000
- based 6510 simulators. The current code was written for portability
- (It took me all of 15 mins to get this code running on my 486 Linux box!),
- not breakneck speed.
-