Sega Mega Drive/Genesis Collected Works

MintyTheCat · Post by **MintyTheCat** » Mon Dec 15, 2014 11:31 pm

My copy arrived today. It is pretty big! Yes, I wish that there was a bit more about the technical side but I suppose for a book aimed at the general MD reader the technical aspects are out weighed by other things.

A nice book to have and I can recommend it to people.

It will take me ages to read it all though as I like to read page by page from the start

BigEvilCorporation · Post by **BigEvilCorporation** » Mon Jan 05, 2015 3:31 pm

Nemesis wrote:Oh man, pity there aren't any more pages of that VDP manual visible, it'd be great to see the full official register list, might give us answers about the few VDP register settings we still don't understand.

Author is @keefstuart on Twitter, might be worth a poke about his sources and if he has more of the doc available.

Eke · Post by **Eke** » Tue Feb 10, 2015 4:05 pm

For those who don't have that book, one of the most interesting interview (in my opinion) has been recently published entirely on this website :

http://www.polygon.com/features/2015/2/ ... i-ishikawa

We wanted the Mega Drive to have the basic performance of the preceding system boards — the System I, System II and System 16 — and we wanted to preserve compatibility with the Mark III. In fact, even SG-1000 II titles were playable on the Mega Drive. The top priority was the Mark III compatibility

The biggest hurdle was the size of the chip. We wanted to include enlarging and minimizing capabilities as well as sprite-spinning functionality, but the circuit design was becoming too large to fit on one chip, which would have lowered the production yield rate and hiked up costs, so we had to remove it from the spec. The number of available colors was also limited by the size of the circuit structure.

The complex circuit designs were FIFO memory, read/write of one line buffer method for drawing, and interlace display.

Interesting how interlaced mode seemed so much important to him, yet it was only used in 2 or 3 games. I guess most people now would have prefered improved color RAM over this feature

TmEE co.(TM) · Post by **TmEE co.(TM)** » Tue Feb 10, 2015 6:38 pm

...aaaand the idea of running out of silicon to have more CRAM got confirmed... *le sigh*