Irem G-101

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naruko
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Irem G-101

Post by naruko » Wed Oct 02, 2013 10:14 pm

メジャーリーグの例外的実装を調査しました。
http://w.livedoor.jp/famicomcartridge/d/Irem%20G-101

メジャーリーグでの要点は下記です。
- nametable mirroring は #1 固定の配線
- $9000 のレジスタはハード側で 0 に固定される

他に質問や間違いがあったらお知らせ下さい。

etabeta
Posts: 109
Joined: Wed Nov 29, 2006 10:11 am
Location: Trieste, Italy

Re: Irem G-101

Post by etabeta » Sun Feb 09, 2014 11:05 am

thanks a lot, naruko!
thanks to your notes, I have found out that I was not handling correctly the fixed PRG banks in MESS for this board: once I fixed those, Ai Sensei no Oshiete finally started to work!

I think I spot a mistake, though
[program ROM #0 or #2 bank mode and mirroring register]
bit assignments
---------------
1 VRAM mirroring (0:V, 1:H)
0 select switchable bank (0:#0, 1:#2)
isn't this the opposite, i.e. bit 1 for selecting PRG bank to switch and bit 0 for mirroring?

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naruko
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Re: Irem G-101

Post by naruko » Sun Feb 09, 2014 4:13 pm

Hello,
This is my mistake. I'll fix my document. Thank you.

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