STE BOOSTER V1 32MHZ & FAST-TOS

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STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Thu May 05, 2016 10:34 am

As people keep asking about STE boosters this is the V1 series which should be up and running fairly soon. I am just waiting for the prototype boards to arrive so I can do final tests before production.

This booster is similar to the V1.5 on the STFM, only the STE seems happy to run at 32mhz. Like my tests in this thread http://www.atari-forum.com/viewtopic.php?f=15&t=28974 Only this is a proper PCB of it.

This kit is a solder in type and will offer 32mhz CPU and 32mhz ROM.

n.jpg


It will also need my Fast-ROM STE adapter.
25_n.jpg


This is dual TOS so TOS1.62 and TOS2.06 will be included as default. The TOS board is available to purchase at a discount price (pre-ordering) from my store for £18 http://www.exxoshost.co.uk/atari/last/store.htm. Pre-ordering for the STE booster will come at a later time.

People have also asked about a plug in version. While this will need another PCB doing, it also needs a expensive adapter which are somewhere around £40+ and seem hard to find.

For UK people, it might be cheaper just to send me your motherboard to fit it and get some other mods done while its here also ;) Though I am unsure if the PLCC adapter socket will be reliable with 32mhz speeds. Any slight bad connection somewhere and things start to fail very quickly. So I am not sure its a good idea to even go down that route.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby GadgetUK164 » Sun May 08, 2016 2:04 pm

Great news! You mentioned its a solder in mod, does that mean you've got to desolder the CPU socket, and this board solders into the position of the old socket? Presumably the TOS board is required for the faster ROM access, so it's not an option but required if you want the v1.5 in your STE?

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Sun May 08, 2016 2:17 pm

GadgetUK164 wrote:Great news! You mentioned its a solder in mod, does that mean you've got to desolder the CPU socket, and this board solders into the position of the old socket? Presumably the TOS board is required for the faster ROM access, so it's not an option but required if you want the v1.5 in your STE?


This version you need to unsolder the CPU and solder the booster board in. Its switchable back to 8mhz so it can run as a stock machine as before.

The fast-rom board is where 50% of the speed gain comes from. It can be run with or without it, but without the fast-rom board there will be a huge speed drop from the booster. So the board is really not optional.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby MM41 » Sun May 08, 2016 3:06 pm

Very impressive, great work Exxos :D,
It's possible to see a video to compare STe 32Mhz and 8Mhz? (with a game or other prg)

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Sun May 08, 2016 4:28 pm

MM41 wrote:Very impressive, great work Exxos :D,
It's possible to see a video to compare STe 32Mhz and 8Mhz? (with a game or other prg)


The results below are with blitter on and off at 32mhz.

STE32mhz_BOFF_BONsm.jpg
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Mon May 09, 2016 1:55 pm

STE with TOS206 and NVDI, 8mhz vs 32mhz.

NVDI_32mhz.jpg



Then without NVDI - stock 8mhz machine vs 32mhz.
32mhz.jpg
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby GadgetUK164 » Mon May 09, 2016 10:58 pm

How come integer division is only coming out at 148% at 33Mhz? I swear mines faster than that at 16Mhz?
Yes, just checked it came out close to 200% which is what you would expect with the integer division. It should now be ~400%, not 148%?

EDIT: I think you've got your images mixed up or something? If I look at the images on the post before those show 364% I think which is about right.

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 2:51 am

GadgetUK164 wrote:How come integer division is only coming out at 148% at 33Mhz? I swear mines faster than that at 16Mhz?
Yes, just checked it came out close to 200% which is what you would expect with the integer division. It should now be ~400%, not 148%?

EDIT: I think you've got your images mixed up or something? If I look at the images on the post before those show 364% I think which is about right.


Your mixing up GB5 vs GB6 test results. GB6 is a totally different benchmarking app. You can't interchange results between GB5 and GB6. GB6 tests may look the same as previous versions, but thats where the similarity ends.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby krupkaj » Tue May 10, 2016 8:25 am

What EPROM are you using? How fast they are?

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 12:30 pm

TOS adapter arrived :)

STE_TOS.jpg
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby joska » Tue May 10, 2016 1:26 pm

GadgetUK164 wrote:Yes, just checked it came out close to 200% which is what you would expect with the integer division.


If you test this on a machine with 16MHz RAM or cache, then I would also expect 200%. Without cache and fast-RAM I would *not* expect 200%. Such a result would indicate a broken benchmark test. Don't forget that without a cache the CPU has to fetch each individual instruction from RAM, and when RAM is running at standard speed (and let's not forget that it's shared between the CPU, shifter and DMA) only *parts* of the instruction execution will run at double/quadruple speed.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 1:44 pm

Joska is right. I should also add that GB4/5 int-div test likely used a really easy number to crunch. I had a chat to d.m.l about this a while back as he re-wrote the test in assembly. Now while I don't know how the code works exactly, the number which is crunched now takes a lot longer. Its a lot "tougher" test than GB4.

Similar is with the blitter tests. Blitter tests generally will show about 600% whereas before in GB4 they would show 700%. That is because the test is now a lot "tougher". GB4 should be viewed as a "light weight" test. GB6 is a more "heavy weight" test.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 2:11 pm

Talk about a tight fit...!

DSCN3177.JPG
DSCN3176.JPG
DSCN3174.JPG
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby qq1975b » Tue May 10, 2016 8:32 pm

8O Ooohhh! I haven't noticed the pac-man drawing!! Cool! :P
Trying to learn...

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 8:48 pm

qq1975b wrote:8O Ooohhh! I haven't noticed the pac-man drawing!! Cool! :P


Your probably the first ;)
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby dml » Tue May 10, 2016 9:07 pm

exxos wrote:I had a chat to d.m.l about this a while back as he re-wrote the test in assembly. Now while I don't know how the code works exactly, the number which is crunched now takes a lot longer. Its a lot "tougher" test than GB4.


Well, yes it is different code and it should spend a decent proportion of its time doing division and less time on the bus. However the 148% figure looks a bit suss to me, for 32mhz. It shouldn't be 400% for sure, but 148... does look on the low side IMO. Probably worth a second look to see whats going on there...

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 10, 2016 9:28 pm

dml wrote:
Well, yes it is different code and it should spend a decent proportion of its time doing division and less time on the bus. However the 148% figure looks a bit suss to me, for 32mhz. It shouldn't be 400% for sure, but 148... does look on the low side IMO. Probably worth a second look to see whats going on there...


I re-tested and came out the same. Base machine is 100% @ 8mhz. So I swapped to 16mhz and the result is still 148% :shrug:
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby dml » Wed May 11, 2016 9:05 am

I'll take a closer look at it here and see whats going on...

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby dml » Wed May 11, 2016 11:37 am

Yep, looks like I didn't configure the initial state properly, so the divide was going into overflow mode and only registering 10 cycles or so per op, which explains the low (but not zero) sensitivity to clock speed. Fixed that and traced through... working correctly now. I'll send over a fix.

This is an unfortunate special case for the divide tests. The other tests in the module won't encounter this problem. They look ok.

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Thu May 12, 2016 7:50 am

I've got updated code from dml, the problem seems to be solved now. The actual results for int-div are 193 @ 16mhz, 355 @32mhz. No other tests are effected. I will post a updated version of GB6 later today hopefully. http://www.atari-forum.com/viewtopic.php?f=28&t=29168
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Mon May 16, 2016 9:46 am

I've added the "guide" to fitting this.. not much to it!

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 17, 2016 6:06 pm

Prototype booster now working with a bit of hackery :)

20160517190415.png


The current layout bumps into the 6809 IC, so the new layout offsets the CPU to the left. Some changes to the design here and there, but this should pretty much be the final design (hopefully).

20160517190630.jpg


STEV1BNCHMRK.jpg
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby qq1975b » Tue May 17, 2016 7:15 pm

Do you know how much compatible it may be with current software? 9X%? And games? around 50%?
Trying to learn...

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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby exxos » Tue May 17, 2016 7:33 pm

qq1975b wrote:Do you know how much compatible it may be with current software? 9X%? And games? around 50%?


Other than raster type demos, everything should work as before, just faster.
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Re: STE BOOSTER V1 32MHZ & FAST-TOS

Postby troed » Tue May 17, 2016 9:17 pm

exxos wrote:Other than raster type demos, everything should work as before, just faster.


So, 99.99% of all demos will be more or less screwed up.

I like your work - but let's set the expectations at the right level :)

/Troed

(I would be in the market for a booster if it was software controlled .. compiling at high speed, running code at normal speed. A mechanical switch would make it quite cumbersome I think)


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