St-fm cpu overclock

[Nikolas]

Hi, i was thinking if there is good way to overclock my st to 16 mhz, i got 68000 p12 - 16 mhz cpus.
And was thinking why not.
Logic chips are cheap and i got lots of chips at home,
i just need good schematis,
good partlist for quality chips, to use H HC or else?

If this topic works ok, then we can put to wiki !

[Shredder11]

I've just got a MC68000FN12F 16MHz chip too and even though I have never attempted a project before, this may be a good one to try. Not sure how easy the rest of the upgrade components are to source. This will be for one of my STE computers but I want a project that does not hog the whole CPU slot to itself, i.e. I can still piggy back my existing IDE interface on top. Simbo in another thread (Replace Floppy thread in Guides section) was suggesting a few minor wires here and there, plus the chip for a cheap upgrade.

[[ProToS]]

have you look this ones
http://atari4ever.free.fr/#speed

[Nikolas]

Any ideas how to view-convert image file?
Once i create litle board with 3 chips. I add into my st, and oc didnt work, glue chip was dead, i was out of luck then.
I lost that litle board, so i need some picture shematic.

[Nikolas]

Any ideas how to view-convert image file?
Once i create litle board with 3 chips. I add into my st, and oc didnt work, glue chip was dead, i was out of luck then.
I lost that litle board, so i need some picture shematic.

16MHZ_ST.ZIP

Plz some one tell me wich program/tool i can open up those images with st or pc

[spiny]

[Nikolas]

Thnkas Mr.spiny !

Edit
I upload st-stfm complete shematic so ppl can wire they 16mhz mod

[Nikolas]

Can i take chips 74hc74 and 74hc00 ? instead of 74ls74 74ls00
It will works same or maybe better?
Wich ones will do best?

[wongck]

Just in case you guys missed this.
A 16Mhz 68000 on ebay.
http://www.atari-forum.com/viewtopic.php?f=33&t=18904

[Omikronman]

You can speed up the ST by using a IPL 4 ACC. It will be like a 8,16 Mhz ST when activated. That is 2 % faster. It may sound negligibly, but if you are raytracing a picture that needs 24 hours you can safe 20 minutes of time. :)

[simbo]

if you have the chip

do it !!!

[Nikolas]

I was thinking to overclock blitter with cpu. bouth to run on 16mhz
Is posible to overclock blitter too?

[Cyprian]

I was thinking to overclock blitter with cpu. bouth to run on 16mhz
Is posible to overclock blitter too?

you can boost blitter by overclocking main bus from 8 to 12MHz.

[wongck]

I was thinking to overclock blitter with cpu. bouth to run on 16mhz
Is posible to overclock blitter too?

you can boost blitter by overclocking main bus from 8 to 12MHz.

main bus?
That will boost everything, no?

[Nikolas]

Yes
I rather oc cpu and
if blitter will work on 16mhz ill leave it on 16 mhz

Now i need to make litle board for 2 chips...

[Nikolas]

My dad makes me litle board for 10eur :- ) got my cpu st68000cp12 at 16mhz now runing atari wery stable

[simbo]

as long as its 68000 me and frankb tried ones from ebay used 68010 16mhz plcc
just clocked at normal to test

it worked booted however hddriver was broken
maybe it detects the mpu type...??? i must send ure an email about it
and i need to try it with some games

then maybe if there is a fix do it
we came to the conclusion that there must be some opcode
or missing instuctions on 68010 that are on 68000
etc

but double to clock against mpu assert is the way,.,

[Nikolas]

Lethal xess dont work on 16mhz,works ok on 8mhz
Some games run ok now. I made shoter data wire lines (from atari board to overclock board), That help alot
still lethal xess not good on 16mhz.

[Nikolas]

16mhz is too fast for st68000cp12 cpu ?

[ralcool]

I would not think so... The Turbo 16 in the thread below has 12mhz cpu.

http://www.atari-forum.com/viewtopic.php?f=15&t=18769

I have tested my 16mhz board i built- like yours...my cpu is only rated 8mhz and it doesn't run @ 16mhz

Circuit is tested with frequency counter and is working 8 or 16mhz output ok. But cpu only boot 8 with disable jumper. (booted randomly with 3 or 4 bombs @16mhz..usually black screen)

There is 68HC00016 on ebay i will buy. Only $10.

[Nikolas]

Thanks for info, need to get 16mhz original..

Mine st68000cp12 boot and works on 16mhz for hours and sysinfo saying 8mhz and benchmarks saying from 120%-180% thats on 16mhz. it working well on 16mhz.
I think is overheated, thats why sometimes it crash within hours. I need to put copper/aluminium plate size of cpu and put grey termal paste to make good cooling for cpu.

Brane Baderljica well known ex-atari hw moder he put one of mine atari st68000cp10 and it was working ok, and somehow stable i think. So st68000cp12 can work even better.

I test my machine and best performance/stability was to use good logic chips 74hcXX(i prefer expensive ones... and with golden pins..lol) and moust shortest lines to overclock_board and cpu.
I test stability with 74ls74 and 74ls00, st crash in 5 seconds
I put back new one 74hc74 and 74hc00 then was workin well.

[ralcool]

This may be part of my crashing then.

I have used a HC74 and a LS00.

Both the 8 & 16mhz clocks pass through the 74xx00. Maybe the LS type handles 8, but unstable at 16mhz. It does pass the 16mhz..my frequency counter says so- but maybe not clean.

I will try 74HC00.

[Nikolas]

Yes plz use 74HCxx series, i try with 74LSxx and aint good at all..

That is my atari with aded blitter and 16mhz cpu mod.


Uploaded with ImageShack.us

That is my 16mhz mod.
On buttom of mod board is pertinax plate and that plate is grounded with wire to main atari ground. So whole mod board sits on that plate.
I even put mini relay so 2 wires goto swich that control relay and relay sets 16mhz or 8mhz(remember..short lines)


Uploaded with ImageShack.us


Used logic chips that controls 8/16mhz for cpu..


Today i put aluminium plate on top of cpu, to cool down cpu. In midle of cpu there is silicium core and i put termal paste in midle of cpu and sides of aluminium cooler i glue it.


Uploaded with ImageShack.us

Once i glue cooler on top of cpu i swich to 16mhz and went to work and after 9 hours i come back and atari was still stable(mouse cursur moving, playing next map) playing populus2 from ultrasatan, lol i made it!
Working wery stable now and with ass kicking performance. Thats with 16mhz and blitter ON. Check bencmark picture



Uploaded with ImageShack.us

Guys i did it well if you got any question abut this topic plz let me ask, im glad to help you

[wongck]

Yes plz use 74HCxx series, i try with 74LSxx and aint good at all..

That is my 16mhz mod.

Guys i did it well if you got any question abut this topic plz let me ask, im glad to help you

This is so cool
will you be making some kits for the rest of the folks here??

[ralcool]

If you want......easy. Parts + postage.