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I've noticed how Sega-Galaga is eerily similar, if not exact, to Casio's own release of Galaga on their PV-2000 system. Significantly, they share the same music arrangement, identical graphics, but what appears to be an older codebase that lacks the functions to draw the scrolling starfield present in the SG-1000 game.

However, the Casio release only credits Namco on the title screen, leaving things up to suspicion. If the two ports are internally identical, did Casio do work for a number of early SG-1000 titles produced by Sega, or was it the other way around?

Pictures for comparison:

Sega-Galaga, SG-1000/SC-3000

Galaga, PV-2000

casio pv2000 hardware is very similar to sg1000, colecovision, sord-m5 and msx1

They could just be ports from a common source but no shared resources other than that. The graphics chip imposes enough restrictions to make similarities likely. I'd expect significant code similarities if they were developed by the same company - which probably isn't Sega, more likely it's an uncredited third party.

I'd like to think a company like Tose did some of the early SG-1000 games. Champion Tennis is very similar to an MSX/Sord M5 game called Real Tennis.

CRV wrote

I'd like to think a company like Tose did some of the early SG-1000 games. Champion Tennis is very similar to an MSX/Sord M5 game called Real Tennis.

And yet that's credited to Takara. Weird. I suspect that Champion Baseball might also be also by an unknown third party, as it's around the early 1983 lineup. SEGA seemed to start their second R&D division around late 1983, and any later "Champion" titles are by SEGA themselves or Compile.

As a note, Super Pac-Man was never released on the SG-1000 but I'm going to take a guess that "Mr. Pack'n" for the PV-2000, or as what the Sord M5 release calls "Power Pac", are by the same presumably unknown developers for the versions of Galaga as seen above.

Until then, I have not yet tried to extract a routine I could compare easily to other games to see for any further results.

For the record, Galax for the Sord M5 is pretty much the same game as Sega-Galaga and PV-2000 Galaga.

Champion Baseball, Champion Tennis, Exerion, and Pop Flamer share about 400 bytes of code.

I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000?

Stokes wrote

I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000?

Maybe SMS or Game Gear (with palette setup) would work better? I think PV-2000 has 4k of Z80 RAM even in its unexpanded configuration, whereas SG-1000 has only 1k

FWIW Sord M5 also has 4K of Z80 RAM, plus it uses a Z80-CTC chip the SG-1000 lacks pretty extensively and interrupt mode 2 with interrupt handler prefix (z80 I register) pointed to a section of RAM

bsittler wrote

Stokes wrote

I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000?

Maybe SMS or Game Gear (with palette setup) would work better? I think PV-2000 has 4k of Z80 RAM even in its unexpanded configuration, whereas SG-1000 has only 1k

FWIW Sord M5 also has 4K of Z80 RAM, plus it uses a Z80-CTC chip the SG-1000 lacks pretty extensively and interrupt mode 2 with interrupt handler prefix (z80 I register) pointed to a section of RAM

Long time question finally answered. Welp, I will see if I could get some games to work and stuff with Casio's games on the SMS / GG.

Author	Message
kaz Joined: 29 Jun 2017 Posts: 6	Sega and... the Casio PV-2000?! Posted: Wed Jul 19, 2017 1:28 am
kaz Joined: 29 Jun 2017 Posts: 6	I've noticed how Sega-Galaga is eerily similar, if not exact, to Casio's own release of Galaga on their PV-2000 system. Significantly, they share the same music arrangement, identical graphics, but what appears to be an older codebase that lacks the functions to draw the scrolling starfield present in the SG-1000 game. However, the Casio release only credits Namco on the title screen, leaving things up to suspicion. If the two ports are internally identical, did Casio do work for a number of early SG-1000 titles produced by Sega, or was it the other way around? Pictures for comparison: Sega-Galaga, SG-1000/SC-3000 Galaga, PV-2000

nitrofurano Joined: 01 Aug 2012 Posts: 322 Location: Porto, Portugal	Posted: Wed Jul 19, 2017 8:47 am
	casio pv2000 hardware is very similar to sg1000, colecovision, sord-m5 and msx1

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14726 Location: London	Posted: Wed Jul 19, 2017 9:02 am
	They could just be ports from a common source but no shared resources other than that. The graphics chip imposes enough restrictions to make similarities likely. I'd expect significant code similarities if they were developed by the same company - which probably isn't Sega, more likely it's an uncredited third party.

CRV Joined: 02 Jan 2005 Posts: 668	Posted: Thu Jul 20, 2017 2:59 pm
CRV Joined: 02 Jan 2005 Posts: 668	I'd like to think a company like Tose did some of the early SG-1000 games. Champion Tennis is very similar to an MSX/Sord M5 game called Real Tennis.

kaz Joined: 29 Jun 2017 Posts: 6	Posted: Sat Jul 22, 2017 7:12 pm
kaz Joined: 29 Jun 2017 Posts: 6	CRV wrote I'd like to think a company like Tose did some of the early SG-1000 games. Champion Tennis is very similar to an MSX/Sord M5 game called Real Tennis. And yet that's credited to Takara. Weird. I suspect that Champion Baseball might also be also by an unknown third party, as it's around the early 1983 lineup. SEGA seemed to start their second R&D division around late 1983, and any later "Champion" titles are by SEGA themselves or Compile. As a note, Super Pac-Man was never released on the SG-1000 but I'm going to take a guess that "Mr. Pack'n" for the PV-2000, or as what the Sord M5 release calls "Power Pac", are by the same presumably unknown developers for the versions of Galaga as seen above. Until then, I have not yet tried to extract a routine I could compare easily to other games to see for any further results.

CRV Joined: 02 Jan 2005 Posts: 668	Posted: Sat Jul 22, 2017 8:57 pm
CRV Joined: 02 Jan 2005 Posts: 668	For the record, Galax for the Sord M5 is pretty much the same game as Sega-Galaga and PV-2000 Galaga. Champion Baseball, Champion Tennis, Exerion, and Pop Flamer share about 400 bytes of code.

Stokes Joined: 17 Feb 2020 Posts: 677 Location: United States	Posted: Wed Jul 15, 2020 6:11 pm
	I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000?

bsittler Joined: 22 Apr 2018 Posts: 530	Posted: Wed Aug 02, 2023 3:15 pm
bsittler Joined: 22 Apr 2018 Posts: 530	Stokes wrote I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000? Maybe SMS or Game Gear (with palette setup) would work better? I think PV-2000 has 4k of Z80 RAM even in its unexpanded configuration, whereas SG-1000 has only 1k FWIW Sord M5 also has 4K of Z80 RAM, plus it uses a Z80-CTC chip the SG-1000 lacks pretty extensively and interrupt mode 2 with interrupt handler prefix (z80 I register) pointed to a section of RAM

Stokes Joined: 17 Feb 2020 Posts: 677 Location: United States	Posted: Mon Aug 28, 2023 5:18 am
	bsittler wrote Stokes wrote I'm curious to ask this, but since they both use the same processors inside the systems like the Z80, TMS9918, and the SN76489, is there a way to convert or port the PV-2000 games to the SG-1000? Maybe SMS or Game Gear (with palette setup) would work better? I think PV-2000 has 4k of Z80 RAM even in its unexpanded configuration, whereas SG-1000 has only 1k FWIW Sord M5 also has 4K of Z80 RAM, plus it uses a Z80-CTC chip the SG-1000 lacks pretty extensively and interrupt mode 2 with interrupt handler prefix (z80 I register) pointed to a section of RAM Long time question finally answered. Welp, I will see if I could get some games to work and stuff with Casio's games on the SMS / GG.

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