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SG-1000 to ColecoVision ports
Post Posted: Wed Apr 04, 2007 7:48 pm
Some people are porting SG-1000 games to ColecoVision. Some interesting technical infos posted along the way.
See:
http://www.atariage.com/forums/index.php?showtopic=104734
http://www.atariage.com/forums/index.php?showtopic=104706

Maybe it could give ideas and motivation to do porting in the other way :)
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Post Posted: Wed Aug 01, 2007 4:56 pm
Porting the other way is a bitch. I tried this. Colecovision games use BIOS routines quite often, so you need to port the BIOS as well...and the memory map is slightly different. Its a challenge.

I got the BIOS to boot on the SMS though :D
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Post Posted: Sun Aug 05, 2007 9:18 pm
Bock wrote
Some people are porting SG-1000 games to ColecoVision. Some interesting technical infos posted along the way.
See:

[links removed so I can post]

Maybe it could give ideas and motivation to do porting in the other way :)


Do you suggest porting CV games to the SG-1000 or to the SMS?
How many SC-1000 or SMS gamers are still out there waiting for new games?

Philipp
 
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Post Posted: Mon Aug 06, 2007 12:55 pm
Well, porting to the SG-1000 would actually be the easier way, but porting to the SMS would allow you to enhance the graphics later. ;)
BTW, it seems that Bruce Tomlim (the one who's porting Black Onyx to the SG-1000) made available the commented ASM code for his port. Maybe it could be used for making an SMS-enhanced version of Black Onyx.
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Post Posted: Mon Aug 06, 2007 1:23 pm
"Porting to the SMS" at first can mean taking advantage of SMS additional RAM. This could be helpful to store a hacked copy of ColecoVision BIOS functions, making a straight port easier. Rewiring the game to take advantage of SMS graphics is another thing.
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Post Posted: Mon Aug 06, 2007 1:53 pm
Hacking an SG-1000 game to have SMS graphics is one of my many "what-if" ideas. However, the major differences between the video modes would be quite a challenge, although probably easier on certain games.
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My abandoned Gyruss port
Post Posted: Mon Aug 06, 2007 3:44 pm
Much to sniff at here. I'm proud of the BIOS portion, but the game rom disassembly just got way too difficult, at least with SMSExamine and DasmX.

Hopefully there are some good ideas in there for others to build on.
041505 halt2ei.zip (69.78 KB)
Aborted Gyruss port

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Post Posted: Wed Aug 22, 2007 7:04 pm
Mike,
Does this code assemble into something that does.. something?

Did you do the BIOS disassembly? Seems very well commented.
Where are those comments from?
; Author: Coleco Industries Inc.
; Advanced Research & Development - Software Engineering
;
; UserID: OS
;
; Starting date: A long long time ago in a galaxy far far away . . .
;
; Prom release date: 24 Nov 1982. For internal use only
; Prom release rev: 7B
;
; Prom release date: December 28, 1982
; Prom release rev: 7PRIME
;
; Header Rev: 2
;
; ****************************************************************************
; * *
; * ColecoVision Operating System *
; * Absolute Listing ( REV 7PRIME ) *
; * ® Coleco Industries 1982 *
; * *
; * *** Confidential *** *
; * *
; ****************************************************************************
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Good question!
Post Posted: Wed Aug 22, 2007 8:40 pm
First off, I should note that I obtained a complete BIOS listing from... somewhere. I forgot. It certainly looked like it was the original sourcecode and not a disassembly. I will post it if there's interest; I just assumed that it was common. If you're looking for a task that will completely fail to challenge you, try telling which comments come from me and which come from the original author.

As for Bock's point about what, if anything, this does: well, it does display the intro screen of Gyruss, with bonus glitchiness. In Meka. If you squint real hard. If you cut all of the Gyruss bits out and just assemble the BIOS, you'll get the BIOS screen. So I've got that going for me.

Anyway, I just thought I'd share what I had to show one way of converting Colecovision games, specifically with respect to remapping ROM and RAM.
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Post Posted: Fri Jan 17, 2020 5:32 am
Here's my attempt at porting Gyruss to SG-1000
Gyruss.zip (17.96 KB)

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Post Posted: Tue Mar 17, 2020 8:27 pm
under4mhz wrote
Here's my attempt at porting Gyruss to SG-1000


That's awesome! FWIW I included a patch in my latest SG2GG package to get this running on the Game Gear using an EverDrive:

https://www.smspower.org/forums/16912#103058

P.S. For best results, leave the file extension as .sms rather than .gg, so it runs in the Game Gear's GG-SMS mode with an uncropped viewing area
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Taylor Stokes' MSX2SMS Ports
Post Posted: Yesterday at 10:38 pm
under4mhz wrote
Here's my attempt at porting Gyruss to SG-1000


Hello there under4mhz. This is a really good conversion for the SG-1000, I'm going to compare it to the original file if that's okay with you.
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Post Posted: Yesterday at 10:42 pm
Last edited by Stokes on Yesterday at 10:55 pm; edited 1 time in total
under4mhz wrote
Here's my attempt at porting Gyruss to SG-1000


ColecoVision BIOS works well. Thanks for your hard work. :-)
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Post Posted: Yesterday at 10:52 pm
under4mhz wrote
Here's my attempt at porting Gyruss to SG-1000


I got Donkey Kong's intro working.
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Post Posted: Yesterday at 11:25 pm
Does anybody else have any ideas for putting Coleco on the SG-1000 or the Master System or even the Game Gear? Maybe an emulator supposing?
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Post Posted: Today at 12:28 am
Stokes wrote
Does anybody else have any ideas for putting Coleco on the SG-1000 or the Master System or even the Game Gear? Maybe an emulator supposing?


Possibly heuristics to rewrite the machine code & allow per-game manual overrides for when the heuristics fail + a tiny porting library to deal with the "more different" parts, mainly input handling? This is a super ignorant guess on my part though
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Post Posted: Today at 11:21 am
Stokes wrote
Does anybody else have any ideas for putting Coleco on the SG-1000 or the Master System or even the Game Gear? Maybe an emulator supposing?

If you're hoping for some magical code that you can just paste onto the ROM and have it run (like the MSX ports) then the answer is no. Even though the hardware is very similar, the way it's setup is too different.

Now, the closest analog for porting Colecovision games to me seems to be the GG2SMS process. So, if you're patient and lucky, you *might* be able to get passable results with find-and-replace hex editing (that's a very big "might", because the memory map is basically completely different, which makes this harder than GG2SMS). But if you want to actually do a decent job of it, you'd want to disassemble the game.
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