Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

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dp11
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Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Postby dp11 » Fri May 18, 2018 5:06 am

Pi3b+ is much faster.

Timings from memory for fast 6502

Pi2 slower than pizero
Pizero 290MHz
Pi3 290MHz
Pi3B+ 336MHz

I have some more speed increases in the pipeline that take the 3b+ to 340MHz.

The original acorn external 6502 copro was 3MHz so 3b+ is over 110 times faster.

Other cores see a speed increase with the 3b+ too.

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Elminster
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Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Postby Elminster » Fri May 18, 2018 8:38 am

Great thanks. Perhaps I need another Pi 3B+ then. Trouble is I already have 15 RPIs. Perhaps I shall have to have a clear out soon!

dp11
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Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Postby dp11 » Fri May 18, 2018 5:35 pm

Just tried running CLOCKSP on native ARM and rpi3b+. Unfortunately it is too fast and gives a divide by zero error as the time for the floating point test <10mS . I guess the speed result to be around 19-20GHz as bas135 floating point is much faster than BASIC II on a beeb.

northernbob
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Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Postby northernbob » Sun May 20, 2018 2:25 pm

dp11 wrote:Pi3b+ is much faster.

Timings from memory for fast 6502

Pi3 290MHz
Pi3B+ 336MHz

I have some more speed increases in the pipeline that take the 3b+ to 340MHz.

.


i realise this is getting a bit silly, but have you tried overclocking the 3b+ ? or does this just mess things up?

https://youtu.be/RxBaEiQHzLU

guide to overclocking the beast.....1.6ghz max
https://youtu.be/aT0OX8TXRCM