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Phil Bennett
L'Emuchat
Reged: 04/20/04
Posts: 888
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Re: Yet an other set of (small) questions...
04/14/10 11:21 AM


> Before submiting my changes to the dev team, I'd like to check some arbitrary choices
> I made...
>
> 1. driver name
> Game is named "Space Ship", and I choose "spaceshi" as driver name. Everybody is
> happy with it ?

I'd choose spaceshp personally - it's a matter of taste.


> 2. file names in .zip file
> I tried to follow Sega games naming convention in Mame.
> I used "sega_reference_for_prom DOT chip_number_on_pcb".
> On the Space Ship PCB, Sega uses a single "chip counter" to identify chips (IC1 to
> IC140) ; on more recent PCB, Sega uses "line/column" locating convention.
> It gives :
> pr03.85 <= chip labelled "PR03" by Sega, located at "IC85" on PCB
> pr17.138 <= chip labelled "PR17" by Sega, located at "IC138" on PCB
> I noticed that later Sega will use "EPR-xxxx" (with a "-") but there's not "-" sign
> on Space Ship PROMs (except two of them)

That's fine.


> 3. Mame-"useless" CCPU PROM dumps
> There are 6 PROMs used only for internal CCPU control.
> They are useless for Mame.
> Should them be referenced by the driver ?
> I think "yes", because it is done in this way for spacewar.
>
> 4. Redundant CCPU PROM dumps
> 5 of the 6 PROMs for CCPU internal control are exact bit-to-bit copy of
> Cinematronic's PROMs for CCPU.
> Only chip reference (on Sega naming convention and on PCB) are different.
> Should these 5 files be in the .zip file ?
> One Sega CCPU PROM is different from Cinematronic.
> I'm sure it is not a dump error, neither a partialy dead chip.
> Differences are in bits that don't affect CCPU behavior.
> For example, while reading an input, Sega does not select some chips just before the
> ALU heart of the CCPU.
> Should this file be present in the .zip ?

Yes, include all the PROMs in the .zip







Entire thread
Subject Posted by Posted on
* Need ROM_LOAD_NIB_HIGH and ROM_LOAD16_BYTE f4brice 04/12/10 11:54 PM
. * Yet an other set of (small) questions... f4brice  04/14/10 08:54 AM
. * Re: Yet an other set of (small) questions... Phil Bennett  04/14/10 11:21 AM
. * Re: Yet an other set of (small) questions... R. Belmont  04/15/10 05:38 PM
. * Re: Need ROM_LOAD_NIB_HIGH and ROM_LOAD16_BYTE Phil Bennett  04/13/10 04:53 PM

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