Falcon ROM Wait States (Speed up your falcon ROM)

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exxos
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Falcon ROM Wait States (Speed up your falcon ROM)

Post by exxos » Mon Aug 28, 2017 11:28 am

FALCWS.JPG
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A lot of Falcon's had slower ROM's meaning Atari had to use "wait states" in order to slow the ROM access speed down. You can however update the ROM with a "Fast ROM" as sold in my store and update the solder links on the falcon to use the faster ROM access speeds. This will give your machine a small speed boost!

The image above shows the solder locations on U46 pads to enable zero wait states.

Below is a benchmark of before and after the fast ROM is fitted.

(click for larger image)
falc1300.png
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The jumper speed settings I have found as stated below.

Where 1 is soldered, and 0 is open. %= ROM speed test in GB5.

10010000 165%
10110000 196%
10100000 142%
10000000 196% (reserved)

While you can try this with your original ROM, I found after several hours of running the Falcon did not power up anymore. So I really do suggest updating your ROM for a "fast-rom" and also TOS404 is the best version of TOS to have on your falcon anyway, so well worth the upgrade if you have a less version.

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Re: Falcon ROM Wait States (Speed up your falcon ROM)

Post by dhedberg » Tue Jan 16, 2018 1:25 pm

exxos wrote:
Mon Aug 28, 2017 11:28 am
While you can try this with your original ROM, I found after several hours of running the Falcon did not power up anymore. So I really do suggest updating your ROM for a "fast-rom" and also TOS404 is the best version of TOS to have on your falcon anyway, so well worth the upgrade if you have a less version.
The original ROM gave up permanently due to lowering the number of wait states? Did it run too hot?
Daniel, New Beat - http://newbeat.atari.org. Like demos? Have a look at our new Falcon030 demo MORE.

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Re: Falcon ROM Wait States (Speed up your falcon ROM)

Post by exxos » Tue Jan 16, 2018 1:34 pm

dhedberg wrote:
Tue Jan 16, 2018 1:25 pm
The original ROM gave up permanently due to lowering the number of wait states? Did it run too hot?
The original ROM isn't fast enough. When I tried it, the Falcon worked for about 6 or 7 hours then refused to boot after that.

Possible putting the slower waitstates back could work.. but I never investigated it, I just put a faster ROM in instead ;)
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tuxie
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Re: Falcon ROM Wait States (Speed up your falcon ROM)

Post by tuxie » Tue Jan 16, 2018 2:08 pm

I use the settings like on the picture and i have a 55ns rom and also my memory is self made with fast Memorys so it works with 25Mhz bus speed for me without any crash

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Re: Falcon ROM Wait States (Speed up your falcon ROM)

Post by exxos » Thu Aug 09, 2018 8:47 pm

A better benchmark with GB6 to show the 0WS speed up...

This particular machine benchmaked all tests at 99% (hence RAM speed 99%) To lazy to get it all accurate, but gives the idea anyway...

0WS_result.png
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4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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