Poll - 8Mhz expansion | MSX Resource Center (Page 1/6)

By sunrise

Paragon (1091)

30-07-2009, 23:06

Me !

By RetroTechie

Paragon (1563)

31-07-2009, 04:32

Just as interesting:

Ofcourse a faster computer is always nice, but what specific applications / uses would you *use* the turbo setting for? That is: most important reason(s) for a speed upgrade, apart from 'want to have' or 'use it on turbo all the time' ?

By Leo

Paragon (1236)

31-07-2009, 08:14

1-
when i do 'dir' in dos it is much faster and convinient with 7MHz
this is not a joke ! very frustrating to see that slow text scrolling.

2- I want to try a new idea for a game dev for instance , quickly, in
basic and i know it is not asm and optimized but i want a bit faster
speed to get something closer to optimized asm running @ 3.5MHz

3- Compilation time : i use gen80 / turbo pascal and i do many
iterations : like little modifications + compilation ( can last few minutes )
and after using a turboR or 7Mhz or even 5MHz it is har to get back
to normal speed. of course from time to time i see what i looks on normal
speed msx's.

4- Boost disk speed ; when you deal with 32kb/64kb images for instance
or EVA player ... backup an entire directory , copy many files ...

5- Symbos

6- i am sure there are others , like few games like dungeon & dragons ....

By Erikie

Champion (324)

31-07-2009, 08:52

I can get the z80 working on 10Mhz and the clock generator chip
In fact I ordered a couple of them already and hope to have them soon.
If anyone is interested in these chips or a working expansion then let me know

By mohai

Paladin (1007)

31-07-2009, 10:22

I can get the z80 working on 10Mhz and the clock generator chip
In fact I ordered a couple of them already and hope to have them soon.
If anyone is interested in these chips or a working expansion then let me know

Is this mod compatible with any MSX model?
Are there big modifications to do inside or just replace Z80, solder awire here and there?

As 7 Mhz mods, is sound affected from this?

As MSX base speed is 3.579545, i suppose your kit should run at about 10.738635, doesn't it?
This means speed x 3. Nice...

By the way, how much does it cost?

By Erikie

Champion (324)

31-07-2009, 11:26

Well the part I ordered are just the most important parts for that standard 7Mhz kit.
But these are the very hard to get parts. The rest is easy (caps, resistor, x-tal)
if you just want the 2 chips it will cost you 20 euros.
I have no kit yet as I first want to expirement with it in one of my 8250s

and instructions about this can be found at HansO: http://msx.retro8bits.com/clock-upgrades.html
Only problem is that Hans is temporarily out of bandwidth :(

By Leo

Paragon (1236)

31-07-2009, 12:26

I have installed once a kit in a vg8235 , what is painfull is to de-solder the old z80.
I have a hb700 i hope it is just on a socket !
...
BTW i was looking into into this recently , because there are z80 clones that are
able to execute one instruction per cycle ( instead of 4 ) like the r800 so you gain
a lot at the same clock speed , it would be more simple just to replace the chip without
extra wire , the problem are :

- you can't switch back to normal speed : if you have many msx's you can have one stuck at high speed.
- as many as i have seen, all these clone are not available in dil40 package , pin compatible ... you
have to make a smal pcb adaptor .. not easy ...

For instance there is the kawasaki kl5c80A12

By HansO

Paladin (672)

31-07-2009, 12:36

Only problem is that Hans is temporarily out of bandwidth

Will be back August 1, which is tomorrow.
I am grateful the site is so popular, its not just one stupid downloader.
Julio Marchi from MSX ALL, who supplies the MSX sites and bandwidth for free, gives us more and more each month

More uploads tomorrow also, found some interesting material again.

By msd

Paragon (1515)

31-07-2009, 15:54

Also lots of games gain from the extra speed up.

By SMDNearDark

Master (136)

31-07-2009, 18:00

I'm also making a small circuit to make the fmpac and musicmodule play correctly on 8mhz (already tested and working)
I just give them their own clock signal of 3,579 mhz. Unfortunately the PSG is built into the engine so i cant do that one (I'll try to find some other way to fix that)

Undeadline is the best example with its flashing sprites it will play much better with the 8mhz expansion.

Ofcourse I also can build it in your msx for you.