Author Topic: Can CPC games be converted to PCW?  (Read 3942 times)

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Offline Starglider

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Can CPC games be converted to PCW?
« on: 01:06, 03 August 19 »
Hi, Star Wars by Domark was released for the CPC but never the PCW. Can it be modded to run on the PCW? This is for a new video I'm working on. Thanks!


https://www.myabandonware.com/game/star-wars-d7#Amstrad%20CPC
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Offline robcfg

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Re: Can CPC games be converted to PCW?
« Reply #1 on: 01:26, 03 August 19 »
It can be ported, like Habi did with PacMania, for example, but it would be a lot of work.
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Offline GeoffB17

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Re: Can CPC games be converted to PCW?
« Reply #2 on: 23:38, 03 August 19 »
Just to spell it out, the CPC machines have quite sophisticated graphics systems, with I understand various 'modes', built in, and supported by ROM code to allow programmers access to this, plus the ability to do things with machine code.   The PCW in effect has nothing, although it does support bit-mapped graphics which may in some regards be 'better' than the CPCs but there is ZERO ROM support for this and a programmer would need to do EVERYTHING regarding graphics from scratch.   Which I assume is what 'Habi' did in the game mentioned above, also consider what was done for games like Batman and 'Head over Heels'.

Oh, there's the matter of colour as well.   The PCW has none, as I'm sure you know, although you might do wonders with variations of grey-scale.

So, to take a 'normal' CPC game and create a version for the PCW you'd need to remove ALL the graphics code and re-create EVERYTHING from the ground up.   Maybe possible, for SOME games, but it would be a LOT of work.

Geoff
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Offline torrind

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Re: Can CPC games be converted to PCW?
« Reply #3 on: 21:45, 04 August 19 »
Sounds like the gauntlet has been thrown! - But don't look at me.  :-X  My best programming effort was a writing quiz program for the Spectrum written in basic for a school competition: Example of it here:

10 PRINT "What is the capital of the UK?"
20 INPUT A$
30 IF A$="LONDON" PRINT "CORRECT":GOTO 60
40 PRINT "WRONG ANSWER"
50 END
60 ......etc etc etc

I didn't win the competition BTW.



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Offline asertus

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Re: Can CPC games be converted to PCW?
« Reply #4 on: 09:54, 06 August 19 »
PCW graphics are not "less" powerful than CPC, just different @Habi knows a lot about that and has converted games like "La Abadía del Crimen" and others:

http://www.habisoft.com/pcwwiki/doku.php?id=es:nuevos:indice


there is a podcast speaking about that and those conversions, but in Spanish.


And here you have a list of "preserved" PCW games...


http://www.habisoft.com/pcwwiki/doku.php?id=es:juegos:indice


« Last Edit: 23:51, 06 August 19 by asertus »
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Online GUNHED

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Re: Can CPC games be converted to PCW?
« Reply #5 on: 17:43, 06 August 19 »
Games:


- No game uses stuff from ROM. You do it by yourself or you're slow.
- Use a MODE 2 game to be converted to PcW, that's relatively easy.
- Also MODE 1 games can be converted, use dithering to emulate 4 colors. Results may vary.


Example: Take a look at Starglider.
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Offline Starglider

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Re: Can CPC games be converted to PCW?
« Reply #6 on: 19:36, 06 August 19 »
Can anyone clarify in very simple terms what the pcw is lacking for games compared to the CPC, and vice versa; what the pcw had that the cpc lacks?


And what if the story with Starglider? Funny enough that's the game I'm featuring for my video.
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Re: Can CPC games be converted to PCW?
« Reply #7 on: 22:14, 06 August 19 »
Well, they don't "lack" IMHO. They are just different. But what do we have in common:


- RAM (even Expansion RAM) can be used in relative similar ways (first 64 KB and E-RAM at &4000, 16 KB blocks)
- FDC (identical)
- Z80 (identical)
- speed (nearly identical)
- PSG (can be put to the PcW IIRC)
- Monochrom mode (similar resolution, but yes, different to program).

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Offline Starglider

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Re: Can CPC games be converted to PCW?
« Reply #8 on: 22:25, 06 August 19 »

Interesting. So what about these differences?:

the CPC machines have quite sophisticated graphics systems, with I understand various 'modes', built in ... The PCW in effect has nothing, although it does support bit-mapped graphics which may in some regards be 'better' than the CPCs ...
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Offline Starglider

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Re: Can CPC games be converted to PCW?
« Reply #9 on: 23:44, 08 August 19 »
If anyone can clarify what the differences are, referenced in the post above this one, it would greatly help with the video which I am finishing up today and tomorrow  ;D  I'll be sure to give thanks in the video description also.  ;)
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Offline robcfg

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Re: Can CPC games be converted to PCW?
« Reply #10 on: 09:08, 09 August 19 »
As far as I know, video memory on the CPC is organized as character rows, while on PCW you can make use of a ‘roller ram’ table that contains addresses in memory for each scanline. You should be able to do nice scrolling by only changing the addresses in that table rather than copying all data to screen every frame.


I’m most probably forgetting more differences...  :D
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Offline P5ychoFox

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Re: Can CPC games be converted to PCW?
« Reply #11 on: 13:04, 09 August 19 »
It’s always intrigued me how many games are dual format and run on both CPC & PCW. Some are even triple format and will run on CPC, PCW & Spectrum Plus 3.
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Offline Starglider

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Re: Can CPC games be converted to PCW?
« Reply #12 on: 00:32, 10 August 19 »
Thanks guys. I kept the explanation a little loose as it seemed to be unclear what the main differences were, but here's the vid (it goes public tomorrow but please enjoy early access:)
https://www.youtube.com/watch?v=bwuH09S5YSE&feature=youtu.be
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Offline menegator

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Re: Can CPC games be converted to PCW?
« Reply #13 on: 22:28, 30 October 19 »
Thanks guys. I kept the explanation a little loose as it seemed to be unclear what the main differences were, but here's the vid (it goes public tomorrow but please enjoy early access:)
https://www.youtube.com/watch?v=bwuH09S5YSE&feature=youtu.be
Great video, thank you.


PS: Your voice is even greater!!!
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