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-
-
- The Minus/4 Emulator V1.1!
- Copyright Mike Dailly 1996,97
-
-
- E-Mail me on
- mike@scotch.demon.co.uk
-
-
- The latest relase can be found at
- www.scotch.demon.co.uk
-
-
-
-
- DISCLIAMER
-
-
- THE BORING BIT! THIS PRODUCT IS FREE. AND AS SUCH I
- ACCEPT NO RESPONSIBILITY FOR ANY DAMAGE DONE BY THIS
- PRODUCT. IF YOU USE IT, ITS YOUR FAULT. IF SOMETHING
- HAPPENS COZ YOU USED IT, ITS YOUR FAULT. IF THE EARTH
- EXPLODES WHILE YOU USE IT, IT'S YOUR FAULT. IF I HAVE
- A BAD DAY COZ YOU USED IT. YOU GUESSED IT - ITS YOU'R
- FAULT! ALL IN ALL - YOU USE IT AT YOUR OWN RISK!
-
-
- Whats NEW now!!
- ---------------
- For V1.1
- ---------
- 1) It now doesn't crash in windows!
- The last one featured a new memory system with a fudge I
- thought would "NEVER" cause any problems... unless you had
- 2 GIGS of memory! :-)
- however, windows being windows... it messed it all up!
- This is now fixed. It still crashes in the debugger if
- you trace for a while at high speed. (not in DOS)
-
- 2) Timer1 is now 100% in SLOW and FAST mode!
- In FAST mode it will add exactly HALF the cycles.
- (including fractions) This fixes the delay problems in the
- last version. Many demos now work correctly.
-
- 3) I have settled on 57 and 114 cycles for fast and slow mode.
- This fixes EXACTLY a few demos that seem to use timer loops.
- It also matches a text file I have on the speed on the system.
- "Genetic Fault" Now doesn't work in the Plasma section. I have
- A few Ideas about this.. and some other "glitching" could be
- due to the delay before drawing the screen...
-
- 4) Added "ASO" instruction. ACE2 (version I have) now decompresses
- and runs correctly.
-
- 5) Its getting a bit slower on Pentium machines... but faster for
- 486 ones... Some feed back on this would help folks! :-)
-
- 6) errr...Im sure I did something else <g>
-
-
- For V1.0
- ---------
- 1) Fixed a bug in the keyboard routine. the "?" key now
- works... stupid bug...sorry. :-)
-
- 2) The emulator now runs at almost Plus/4 speed on my P100!!!
- In mode 13 it runs faster! cool! The CPU emulation is still
- in "C" - but after doing some in assembler, it seems that
- it kills the cache and slows it down?!?!
- So I'll prob leave it in C. Its far easier to maintain
- anyway!
-
- 3) This isn't "IN" as such, just lots of ground work...
- I have decided to "try" and get hardware 1541 emulation
- This means I will emulate the full ROM/CPU of the drive,
- along with the hardware GCR reader. This will still work
- with .D64 files. (I'll just translate this into GCR data)
- This will take a LONG time to implement. BUT it should work
- with EVERY loader!!! I also don't know how fast it'll be as
- I'll be emulating 2 machines at once!
-
- 4) The timer is now 100% in 1Mhz mode. It even runs the demo I
- thought it never would! :-)
- In 1.78Mhz mode...I don't know how I'll work this one!
- It may end up close...but not exact...
-
-
- Thanks to everyone that e-mailed me about releasing small
- versions... You all want it so! Here you go!
-
- This version is mostly a speed up... But theres still a
- LONG way to go. The CPU is okay, but the screen render is
- CRAP!!! Thats next I think! :-)
-
-
- I may be helping on the VICE project soon as well. This
- is a very cool project to emulate ALL C= machines in one
- project. It already has C64,Vic and Pet! AND It does
- hardware 1541 emulation! (very nice too!)
- I have been asked to help and add Plus/4 support - which
- I'm going to try! It runs mostly on Unix (linux, Irix etc)
- but they are doing an MS-DOS port as well..
-
- As a result... development may slow down on THIS version,
- as I try and do that one... And in the end, this one may
- STOP altogether! (If the other one is better, they why carry
- this on?) The other version is also doing SID emulation..
-
- Any worries, questions.. e-mail me!
-
-
- For V0.9
- ---------
- 1) I'm trying a new approch to the keyboard. (again).
- But as I still don't know how it all works, Im still
- playing. This "seems" to be better.. but still not right
- as games like Elite STILL don't respond to keypresses..
-
- 2) I've switched off VBLANK syncing by default. This speeds
- things up a bit. If you want to use the 360x240 mode, your
- video card MAY insist on VBLANK syncing.. use the -v
- command line option.
-
- 3) Thanks to Luca/FIRE for pointing me to a NON standard
- opcode program. I have now added quite a few non-standard
- opcodes. Many more decrunchers now work fine! Theres still
- a few left, but some may never work as they EOR with the
- timer!!?!??!? I may get it, but no time soon..
-
- 4) Added register $ff1e correctly. This solves MANY raster
- glitches. $ff1f has not been added yet...
-
- 5) Timers now work. $ff00 and $ff01 work at a resonable speed.
- But not 100% correct. Its right for the single clock mode
- only.. Timer 1 will also reload correctly. Timers 2 and 3
- just count down and set IRQ bits 3 and 4. they DON'T
- generate IRQ's just yet. Anyone have a game/demo that uses
- this? Timer 0 DOES generate IRQ's.
-
- 6) Added ECM mode. "Genetic Faulty" now seems to work
- correctly. This is the ONLY thing I found that uses ECM!
- anyone got any others??
-
- 7) Added the ECM+MCM screen black out. Again "Genetic Faulty"
- uses this.
-
- 8) Added a VIEW current frame in debugger, Lets you see what
- the screen is like so far. This is updated every scan line
- so you can watch each raster being drawn. Quite cool.
-
- 9) Added a picture saver! It saves .BMP's Sorry its not
- something like .PCX or .GIF, but BMP files are just SO
- simple to write, no compression, no problem. you can use
- Paint Shop Pro or something to convert it.
-
- 10) Changed and added some keys in the debugger. See below for
- a complete list.
- Any requests? Anything more you'd like to see? FULL break
- points? anything? Im not promising, but you never know!
-
- 11) Added this history.txt file. It was getting a bit big!
- I also moved the other file around a bit.
-
-
- On the whole, its getting quite good now. It seems to be able
- to run 95% of stuff now. I did speed it up quite a bit, but
- then I added a whole load of stuff, so its back to where it
- was... typical! :-)
-
-
- Sorry for all these "little" releases. But Im just doing this
- when I've got time! V0.7 took SOOO long to come out that I
- don't want that to happen again. So, whenever I add something,
- I'll release it. If you don't think this is a good idea,
- e-mail me. I don't know unless you tell me!!!
-
-
-
- For V0.8
- --------
- 1) Fixed a NASTY bug in the debugger (of all things:-)
- Was crashing the machine. Sorry!
-
- 2) remapped GO key to F8 in the debugger.
-
- 3) Added a Loader. Now when you press F10, you are presented
- with a list of files to load!
-
- 4) The loader can now load .D64 type files, and will list the
- disk directory when selected. Unless there is a real need,
- I don't think I'll bother with .T64 files... who uses them?
-
- 5) Added a bit of a delay to the raster IRQ's. This was
- causing some glitching in games like "The Hobbit" and cool
- demos like "Genetic Faulty". I don't actually know the delay
- the Plus/4 has on interupts, so I've guessed a little. It
- doesn't fix EVERY glitch... but its much better.
-
- 6) The command line has changed. You no longer specify the
- GAME on the command line, but the directory where your
- games are. I'll add a directory system in later.
-
-
- This relase is really just a fix for the debugger bug. It was
- quite nasty, but I wanted you to have another reason to get
- the latest version, so I added some other bits. Besides,
- thanks to "Marco Polo" I now a CD FULL of Plus/4 .D64 files!!!
-
-
-
-
- For V0.7
- --------
- 1) The biggest change is that I have added MODE-X support.
- This allows for a strange mode of 360x240. It also gives me
- a 20 pixel area each side to draw the border. It even
- allows for the effects of text in the border (which now
- seems to work on some intros!).
-
- 2) The joystick can now be used by pressing F5(on/off).
- The keys are up,down,left,right and space. However
- theres still some real problems with this...
-
- 3) I have added some processor timings, meaning that its about
- the same number of cycles a frame, it also helps some demos
- work better.
-
- 4) And a bad one.. Its a bit slower now because of the Mode-X
- screen flip. This must be synced with the VBLANK, and it
- was free running before.. so its a bit slower...sorry.
- you CAN switch this off if you don't care about the
- borders.
-
- 5) Command line options!
- Not much just now. /? for a list, and -x to disable mode-x
- The first command line option MUSt be a game! then the
- options
-
- 6) Y smooth scrolling. At last. This is more or less in. I
- never used this when writing stuff on the Plus/4 myself,
- so I don't know exactly how it works. The basic screen
- and split screen works, but You get garbage in the middle
- on split screen games. Anyone know how this works?
-
- 7) Keyboard routine has be rewriten. BUT! My keyboard routine
- sucks! So you cant press RIGHT-SHIFT then the "/?" key!
- as the "/?" key wipes the shift?!?!? anyone know how to fix
- this? Im also having problems with games like Elite and
- Mercenry and key presses. They don't work! Well, elite sort
- of does...at the start? Any clues??
- Caps-Lock is now Run/Stop BTW
-
- 8) F12 now acts as the soft reset (so F12+CAPSLOCK will give
- the monitor) Does NOT wipe memory!
-
- Sorry theres not more in. Im finding it hard to find time
- to do more.
-
-
- For V0.6
- --------
- 1) Added "DOS4GW.EXE" to the archive... sorry chaps!
-
- 2) Added screen "BLANKED" mode ($ff06, bit 4)
-
- 3) Register $ff1c and $ff1d are now, read write. (I hope!)
-
-
-
- For V0.5
- --------
- 1) Most games now seem to work! whaahay!
- Still can't get the processor speed quite right (cycles per
- scan line). Some require about 61, and others about 100!
- Ah well, I'll work it out..
-
- 2) The packer problem in V0.4 turned out to be corrupted
- files! great! the best kind of problem!
-
- 3) I've added scrolling in X, but not Y yet...
-
- 4) Fixed up small problems in the raster system...
- I still seem to get a glitch in graphic mode 2
- (BASIC's split screen graphics). There shouldn't be
- a black line there... Mmmm..
-
- 5) Fixed some crashes, but it still happens now and then...
-
-
-
- For V0.4
- --------
-
- 1) Well, I've added the bit maps modes. Hires, and Hi-res
- multi colour! What this means, is games like 3DPOOL now
- work!
-
- 2) I've also added a command line option to allow you to load
- any game (.PRG file) you want! Most still dont work, so
- don't get too excited! but the problems seem to be with the
- packers, and not the games...
- I'm still working hard on it, so don't worry!
-
- 3) working games so far... (that de-crunch that is..)
-
- All basic programs seem to work...
- Finders keepers (default game)
- Trailblazer (the file called "a" in the .ZIP??)
- Airwolf - except the scrolling....(Next?)
- 3DPool!
- if you find any more, let me know!
-
-
-
-