Jump to content

Polybius's Photo


Member Since 1 Jul 2009
OFFLINE Last Active Sep 16 2016 9:29 PM

Posts I've Made

In Topic: Z80 vs. 6502

Fri Sep 16, 2016 9:30 PM

So how come the Z80 shines on SMS but on Spectrum it all looks like regurgitated toe nails?

That has to do with the SMS Graphics chips and parser compared to the spectrum. The SMS had additional chips to help with the load, while on the Sinclair machine, the Z80 is responsible for practically everything on a Spectrum, from drawing the graphics, tracking movement, and even parsing text.  Plus, the sprites in memory were stored on the spectrum in black and white, and the color was added to the screen as it was drawn. 

In Topic: Colecovision Vs. NES in graphics.

Fri Sep 16, 2016 9:13 PM

CPU wise, back in 1997 - four years before the first MiniGame compo - there were a series of programming battles between the Commodore 64 (1 MHz 6510, running 6502 code) and the ZX Spectrum (3.58 MHz Z80) to see which computer/CPU would be most efficient on various tasks and algorithms, counted in clock cycles. If I understand the conclusion right, it ended with the C64 had a 3:1 advantage, which evens out due to the ZX running at a higher frequency. You can find some of the results here: http://www.ffd2.com/fridge/speccy/

Of course many of those programs utilize the vast RAM of respective computer, perhaps to a bigger extent on the C64 as the 6502 has much fewer registers than the Z80 has. The ColecoVision has the same 3.58 MHz Z80 and 1K RAM, while NES has a 6502 near clone from Ricoh running at 1,66 - 1,79 MHz and 2K RAM + possibility to add RAM on the cartridge. Properly coded, the NES would even do calculations a bit faster than the ColecoVision, ignoring everything that has to do with graphics and sound output.

It is a common mistake to just look at the MHz when comparing processors of different architectures. Just look at how Apple desperately tried to convince buyers that a 1+ GHz G4 was at least as powerful as a 2+ GHz Pentium 4, although the numbers themselves would suggest otherwise.



True, the big reason for the commodores advantage, despite the slower clock speed, was due to its graphics proccessor and a slew of other chips that worked alongside it, where Sinclair computers used the main processor for everything, one chip handled everything on screen.  If Sinclair had additional chips for the graphics and text, it would have been a much faster machine than a lot of machines, but also vastly more expensive than it was. 

In Topic: Next Atari Flashback?

Fri Sep 16, 2016 5:27 PM

I would really like if they made one with a Cartridge slot, or at the very least, an SD card slot.  That would be awesome!

In Topic: Do you play with your collection

Fri Sep 16, 2016 1:50 PM

For the most part, I do play with my collection, although when I play a piece may be a while between playings. 

In Topic: Abandoned arcades, decaying arcade machines (Make Arcades GREAT Again)

Wed Sep 14, 2016 9:54 PM

It's saddening, yet eerily Heartbreaking, like looking at an abandoned car, or closer still, an abandoned amusement park. Is it odd I find a strange beauty in ruins?