TF330 Performance Improvements

[Gooeyblob]

I have an idea on how to speed up the Akiko routine and also cure the screen corruption issues...

[pipper]

...turn off the data cache only during the Akiko C2P conversion?

[Gooeyblob]

No, data cache stays on!

[terriblefire]

Is this a tweek to the c2p routine?

[Gooeyblob]

Yes and it may be possible to use your boot rom to patch the graphics library so detection works.

[supaduper]

Just thought I would answer GadgetUK here as to his enquiry about MMU working on the TF330, so I swapped out the EC 68030 ( No MMU) for a full 68030 CPU ( with MMU, gold top)

I then installed the excellent Thomas Richter MMU libs which can be found easily on Aminet over my Classic workbench CF, then ran sysinfo just to get the results, I know sysinfo is not the best benchmark tool but for this purpose it will do fine, the results are blow , speed increase on the Drive is very nice indeed and the system works great with installed MMU libs

[terriblefire]

Nice work.

[8 Bit Dreams]

This is why ive shipped my TF cards with MC68030RP33 CPUs - to get muFASTROM working..
The next problem was CF adapters from china - these decelerated IDE on TF534i instead of increasing speed, SD to IDE works nice

Next problem is that i have now about 30x 33Mhz CPUs that are not running/or not even boot @50Mhz on TF cards, what annoys me - that these CPUs are running for hours on other cards without a single issue, maybe Stephen can explain better what causes that, i really have no explanation for that.

[supaduper]

This is why ive shipped my TF cards with MC68030RP33 CPUs - to get muFASTROM working..
The next problem was CF adapters from china - these decelerated IDE on TF534i instead of increasing speed, SD to IDE works nice

Next problem is that i have now about 30x 33Mhz CPUs that are not running/or not even boot @50Mhz on TF cards, what annoys me - that these CPUs are running for hours on other cards without a single issue, maybe Stephen can explain better what causes that, i really have no explanation for that.

I am surprised you even get 33mhz CPU to run at 50hz, I have about 6 out of ten success rate with my 40mhz ones to run at 50htz, I will have to send you a few of my reject 40hz ones for you to try

[8 Bit Dreams]

Surprisingly CPUs with older masks are working @50Mhz without any problems, while newer mask CPUs are able to run @40Mhz only..

Following masks reject to work on TF's for me:
68030RP33B 04D66C, 09D66C, 62C74N

bought 10x MC68030RP33C with 01F91C mask, this is latest mask available, and these are NOT working @50Mhz on TF cards (TF330 nor TF534), however woking fine on Blizzard IV 1230 @50Mhz and also 68030 TK.. So Yeah, no idea why.. Maybe because of INT2 workaround (not sure if it present in TF330 firmware) hopefully Stephen can explain this.

2019-09-01 18.10.20.jpg

Ceramic CPUs are clearly rebranded, however these can do @50Mhz on Blizzard IV 1230