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Anna Wu Offline OP
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Great work and screenshots, Barry.
Let me check some other games ...

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Anna Wu Offline OP
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Pegasus driver

It seems, I must make a clean compile because I am not able to load Tank.wav or Invaders.wav sucessfully.

Bios default
M
>L
Press Enter
Play Tape

The Tape counter never stop.

Last edited by Anna Wu; 04/27/10 02:14 PM.
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Some tapes just won't load. It seems that tapes made by one machine could not always load on another. I did get a Tank.wav that does work, but I could never load Invaders.

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Anna Wu Offline OP
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Originally Posted By robbbert
Some tapes just won't load. It seems that tapes made by one machine could not always load on another. I did get a Tank.wav that does work, but I could never load Invaders.


Thank you for your feedback. You are right, my .wav dumps was wrong.
Now, I have the right ones. Invaders.wav is working too.

Happy birthday, lord_philip ! wink

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r7918
Fujitsu FM Towns
Added CRTC Horizontal Adjust register, fixes some background offsets.



- Barry Rodewald
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One more for today smile

r7921
Improved VRAM address offset for 256-colour layers. Flashback is now playable.



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Anna Wu Offline OP
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SVN r7918
Fujitsu FM Towns

Syndicate (U) CD-ROM (CHD)

The startscreen, intro and the configuration are ok but if start the gameplay (Loading Game), I have sound and a black screen.





Last edited by Anna Wu; 04/28/10 09:11 AM.
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"[PEGASUS] Added decryption of bios and carts, if first byte is 02. Added notes. Removed commented-out printer."

This sounds.. ugly? Isn't this where you'd want the software lists, and a 'type' to indicate that they're encrypted.

Guessing if something is encrypted from a byte in a cart is a hack at best, and as bad as the 'guess the SRAM size' type hacks that hopefully the software lists will abolish completely.

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on the long term, yes. software lists might cover these things more easily (even if keeping this trick for non-softlist loading cannot harm, as long as the source documents why is there)

otoh, on the short term, there is still a lot of work to be done on software lists before they can be considered the suggested way to load games in MESS: we lack mirroring of rom for games which use it, we lack a standard way to handle per-game sram, etc.

as a result (and because pegasus emulation is in progress), this 'ugly' solution is imho perfectly fine at this stage.

btw, thanks Robbbert for getting in touch with the Pegasus guy at Mbee boards. I don't know when/how this system would have been otherwise preserved

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Yeah, it's lucky he posted about it, otherwise I would never have known of its existence. There were manuals and software, and the schematics revealed standard chips, nothing over-complex, so I realised that it could be emulated without much trouble.

As for encryption, as AnnaWu posted, it's really just that the address and data lines are swapped around, for convenience or annoyance who knows, in any case a single eprom always has 20 as the first byte in order to be recognised and appear in the menu. In the "encrypted" form, this becomes 02. So while appearing to be ugly, it means you can load a rom of either type and if it needs to be decrypted it will happen automatically. This even applies to the bioses, some are encrypted and some not. Obviously, we would like to have all encrypted ones if and when they become available.

Of course, software lists can be used somewhere down the track.

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