maprom 1.8 working on TT

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Steve
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maprom 1.8 working on TT

Post by Steve »

I just decided to try @agranlund 's maprom on my TT and it makes it marginally faster :) some slight decrease in vdi but overall faster. @tuxie

Gembench Vs itself before/after
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exxos
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Re: maprom 1.8 working on TT

Post by exxos »

I think maprom really needs fast alt-ram to give speeds boosts.
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czietz
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Re: maprom 1.8 working on TT

Post by czietz »

Is it any faster / different that what ROMSPEED would do on the TT?

https://seimet.de/atari/files/rmspd311.zip
https://github.com/uweseimet/atari_publ ... r/ROMSPEED
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Badwolf
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Re: maprom 1.8 working on TT

Post by Badwolf »

That's a bit strange. 2x speed on ROM access, but display routines are only just break even, some getting worse?

Is there something clever going on under the hood of TOS3 normally?

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
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exxos
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Re: maprom 1.8 working on TT

Post by exxos »

Badwolf wrote: Tue Feb 23, 2021 5:39 pm That's a bit strange. 2x speed on ROM access, but display routines are only just break even, some getting worse?
Never noticed that.. maybe @Steve can try without caches on to see if it drops ?
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Steve
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Re: maprom 1.8 working on TT

Post by Steve »

Wow @czietz thanks for the tip, romspeed is amazing :)
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stephen_usher
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Re: maprom 1.8 working on TT

Post by stephen_usher »

Remember that the ROM access on the TT normally is 32 bits wide, which speeds it up somewhat. The TT-RAM interface is faster than the ROM but also 32 bit, so it doesn't make as much difference as it would on an ST+TF, which changes slow+16bit (two read cycles) to fast+32bit (one read cycle).
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czietz
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Re: maprom 1.8 working on TT

Post by czietz »

EDIT: I see that I'm too late.

This is with ROMSPEED mentioned above - where the reference (=100%) is my TT running TOS from ROM:
IMG_4645.JPG
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The absolute numbers are different from your TT because mine is accelerated to 48 MHz.
Steve
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Re: maprom 1.8 working on TT

Post by Steve »

@czietz guys you gotta sort me out with a speedy already! 8-)
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Badwolf
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Re: maprom 1.8 working on TT

Post by Badwolf »

I had a go comparing the both on the Falcon @48MHz (speed relative to same configuration with hardware ROM).

As I expected, the results are pretty much the same.

MAPROM:
dfb1_maprom.jpeg
dfb1_maprom.jpeg (132.61 KiB) Viewed 2864 times

ROMSPEED:
dfb1_romspeed.jpeg
dfb1_romspeed.jpeg (129.37 KiB) Viewed 2864 times

So does that imply MAPROM doesn't like the TT? (I have looked at the sources before, but it's all Greek to me :D )

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
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