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- Apple 2 Emulator
- ~~~~~~~~~~~~~~~~
- (written and put into the public domain by Claudio Nieder)
-
- Version 0.1, 03-Jan-1993
- ~~~~~~~~~~~~~~~~~~~~~~~~
- This is the first version of an Apple 2 emulator I'm writing.
-
- Although this is a alpha test version, it is quite stable. It doesn't
- produce any enforcer or mungwall hits. It doesn't loose memory.
-
- The emulator is written in Modula-2 and was compiled with M2Amiga V4.1.
-
- What you need
- ~~~~~~~~~~~~~
- You should have a fast Amiga. I am using it on a 25MHz Amiga 3000.
-
- You should have at least 0.5 MByte contiguous memory free, when
- loading the emulator.
-
- You should have at least Workbench 2.04.
-
- You should have an Apple 2 from which you can transfer the ROMs and the
- contents of your Apple 2 floppies to the Amiga.
-
- You need a cable to connect the annunciator ouput port 0 (AN0 on the game
- paddle connector) to the receive data input of the Amiga serial port.
-
- You need a way, to transfer the audio output from the Amiga to the Apple 2.
- This can be either done, by first recording the output of the Amiga on a
- tape, and then playback it to the Apple, or by a direct cable. I have tried
- the first method only, using two different tape recorders, so I didn't need
- to get a special cable.
-
- What it does
- ~~~~~~~~~~~~
- Currently it emulates an 48K Apple 2 with two disk drives. Only the text
- page can be displayed until now.
-
- It runs BASIC programs at about 1/10 the speed of an original Apple 2.
- Disk access can be as slow as 1/60 of an original Apple 2. So you have to
- be patient when booting. This may take 5-6 minutes.
-
- The disk drives are also emulated, i.e. you don't connect directly your
- Apple 2 disk drives to the Amiga. You can use your Apple 2 to tranfer the
- contents of a floppy to the Amiga. On the Amiga you can use the floppy
- for reading and writeing, but at the moment it is not possible to save
- back a floppy.
-
- Setup
- ~~~~~
- First unpack the archive, if you haven't already done it. The archive
- should contain these files:
-
- Apple
- Apple.info
- AppleComm
- AppleComm.info
- Readme
- Readme.info
- Bugs
- Bugs.info
- TODO
- TODO.info
- AmigaComm.source
- txt.info
- txt/Apple.mod
- txt/Apple.mod.info
- txt/AppleComm.mod
- txt/AppleComm.mod.info
- txt/AppleScreen.def
- txt/AppleScreen.def.info
- txt/AppleScreen.mod
- txt/AppleScreen.mod.info
- txt/ACASLReq.def
- txt/ACASLReq.def.info
- txt/ACASLReq.mod
- txt/ACASLReq.mod.info
- txt/ACGadgets.def
- txt/ACGadgets.def.info
- txt/ACGadgets.mod
- txt/ACGadgets.mod.info
- txt/Base37.def
- txt/Base37.def.info
- txt/Base37.mod
- txt/Base37.mod.info
-
- The programs you need are Apple and AppleComm, which should be placed in
- the same directory. Bugs and TODO are text files. The directory txt/
- contains the source of the Apple 2 emulator. The file AmigaComm.source
- contains the assembler source for the Apple 2 program which can send
- Disks and ROM contents from the Apple to the Amiga.
-
- As a first step, we have to bring the program AmigaComm onto the Apple.
- Connect a tape recorder to the Amiga audio output. Start the program
- AppleComm on the Amiga. Start the recorder, and click on the "Send AmigaComm"
- gadget. When the status line "Sending AmigaComm(31xxx)" disappears, you can
- halt the tape recorder.
-
- Now connect a tape recorder to the Apple 2. On the Apple enter the monitor
- (CALL -151) and type 8000.8586R. Play back the recording you have just
- made.
-
- When playback is finished, you have the program "AmigaComm" on the
- Apple 2. This program allows you to send the contents of the needed ROMs
- and the contents of floppies to the Amiga. You should save the
- Program to a floppy with
-
- BSAVE AMIGACOMM,A$8000,L$587
-
- so you can use it later.
-
- As next step you need to transfer the contents of the BASIC ROM and of the
- PROM on the disk controller. For this you need to connect the annunciator
- output 0 to the Amiga serial port receive data line. You have to start
- the AppleComm program on the Amiga, and the AMIGACOMM program on the
- Apple. Click on the "Receive ROM" gadget on the Amiga, and press the
- "R" key on the Apple. This will transfer the two ROM contents, and save
- them in the appropriate files.
-
- If you want run programs you already have on Apple 2 floppies, the you
- can tranfser them too, using AppleComm/AmigaComm. Click on the "Receive
- Disk" gadget on the Amiga, and after that press "D" on the Apple. After
- the transfer of the disk, a requester will ask you for a name, on which
- the disk contents shall be stored. Each floppy will currently use
- approx. 230kByte. Future version of this emulator will probably
- store those files in a compressed form.
-
- Some explanation to the program Apple
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Menu
- ~~~~
- The Project menu contains only the function Quit. As I'm still debugging
- this program, this function will not immediately terminate the emulator,
- but pop up a requester. Click on the gadget "abbrechen" to terminate the
- emulator.
-
- The Disk1 and Disk2 menus are identical. They provide functions for loading
- a disk, unloading a disk, and write protecting a disk.
-
- NOTE: Unloading does not save back the diskette on the file. So at the
- moment you can't keep changes you've made.
-
- Keyboard
- ~~~~~~~~
- The only special key of the Apple 2 is the RESET key. On the Amiga
- you have to press HELP.
-
-
- Bugs & Questions
- ~~~~~~~~~~~~~~~~
- If you have any bugs to report or questions to ask:
-
- Before March 1, 1993, you can send me mail (claudio@chuug.ch).
-
- After March 1, 1993, you should ftp the newest AppleOnAmiga.readme
- from ftp.eunet.ch [146.228.10.15] to see, if the program was updated.
-
- claudio
-