home *** CD-ROM | disk | FTP | other *** search
- From asm332@cix.compulink.co.uk (Sean Eaton)
- From: asm332@cix.compulink.co.uk (Sean Eaton)
- Subject: VIC-20: How to load software.
- Date: Sun, 30 Jan 1994 14:49:07 +0000
-
-
- d3daniel@dtek.chalmers.se (Daniel Hansson) writes:
-
- > Anyone who's succeeded in loading any program into the VIC-20
- >emulator? I have downloaded some games from funet but the doc's doesn't
- >tell how to get them in the emulator! I've tried to put them in memory-
- >location $0401 in the configure file, but this gives me a guru.
- >
- > Any ideas?
-
- Ok, the files on funet can be loaded although the process is a little
- more complex than mounting them in the VIC's RAM on power-up.
-
- The best way is to show by example:
-
- * First of all remove the line which says "$0400 ram3" from the *
- * vic-conf file. Now when you run the emulator it should say "3583 *
- * BYTES FREE" and not "6655 BYTES FREE". You now have an unexpanded *
- * VIC and not one with a 3K ram-pack. *
-
- Let's say you've transferred vic-man from funet. The first thing you
- must do is find its start address. All the programs on funet are
- in the VIC's disk drive format which means that the first two bytes
- form the start address - low byte first, then high byte.
-
- You can find the start address very easily from Amiga DOS:
-
- 1> type vic-man opt h
- 0000: 01100C10 0A009E20 34313130 00000078 ....... 4110...x
- 0010: A97F8D1E 9120681B 209114A9 FF8D0590 ..... h. .......
- 0020: AD119149 FF2920F0 08AD0090 09808D00 ...I.) .........
- ***BREAK
-
- The first two bytes are 01 and 10. Swap them around to give 1001
- and that's your start address!
-
- 1000h (4096) is the start of BASIC on an unexpanded VIC.
-
- Run the emulator, making sure that you've removed the $0400 ram3 line
- from the config file, then type LOAD"VIC-MAN",8. You must make sure
- any files you wish to load are in the current directory.
- The VIC will respond by saying LOADING.
- Loading is not instantaneous; you'll have to wait about 15-20 seconds
- for a full 3K program.
- Once it has loaded, you can run it or list it or do whatever.
-
- Downhill, froggie, outpost and lucy_lizard are also unexpanded
- programs and are loaded in an identical way, though you might
- want to rename lucy_lizard to lizard or something without an
- underscore as the VIC doesn't have one.
-
- Screen-40 and othello_ii are examples of 8/16K programs:
-
- 1> type screen-40 opt h
- 0000: 01120C12 0A009E20 34363232 000000AD ....... 4622....
- 0010: 1F91C946 D007A91F A0122060 1A4C3E12 ...F...... `.L>.
- 0020: 930ED343 5245454E 2D34300D C6495845 ...CREEN-40..IXE
- ***BREAK
-
- Swap the first two bytes and you get 1201h (4609) - the start
- of BASIC on an 8 or 16K VIC.
-
- This time run the emulator with the command line:
-
- 1> run vic-20 $2000 ram8 (for a VIC with an 8K Ram pack)
- or
- 1> run vic-20 $2000 ram16 (for a VIC with a 16K Ram pack)
-
- It's probably best to use the 16K version. Once the VIC
- powers-up, type "LOAD"SCREEN-40",8 and settle down for a nice
- long wait.
-
- I haven't come across any games that need the 3K Ram pack yet
- but I would imagine they'd look like this:
-
- 1> type someprog opt h
-
- 0000: 0104.....
-
-
- In which case invoke the emulator with the command line:
-
- 1> run vic-20 $0400 ram3
- and load as before.
-
-
- You might like to check out ftp.hrz.uni-kassel.de.
- It is stuffed full of fossilised cartridge images.
- These can be mounted in the VIC's ram from the command line
- quite simply:
-
- 1> run vic-20 $a000 GORF (or whatever)
- and they auto-boot.
-
- Battleship is a 24K game; run the VIC with $2000 ram24 and type
- LOAD"BATTLESHIP.BIN",8 and sit back and have a cup of tea for
- 10 minutes.
-
- Incidentally, if you don't like hanging around for the programs
- to load you can cheat:
-
- Look at the dump of vic-man (above). See the 4110?
-
- Type 1> run vic-20 $0fff vic-man
- then type SYS4110.
-
- Subtract 2 from the start address: 1001h - 2h = 0fffh
-
- This will also work with programs that need a Ram pack:
-
- 1> run vic-20 $11ff screen-40 $2000 ram16
- followed by SYS4622
-
-
- (The Ram pack must come last on the command line, otherwise you'll
- get an unexpanded VIC.)
-
- This doesn't work with BASIC programs, though; these must be loaded
- the slow way.
-
- Hope this helps. (phew!)
-
- -Sean.
-
- By the way, the emulator appears to come supplied with the C64's
- character ROM and not the VIC's. I transferred the VIC's
- character ROM yesterday. I will upload it to aminet if anyone
- wants it.
-
- Has anyone else noticed that the emulator's screen is stretched
- slightly vertically whereas on a real VIC it is stretched horizontally?
-
-
-