CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Information and news about the 68SEC000 64MHz booster.
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 3:58 pm

Currently tweaking the layout a lot as I am trying to get space to snake out 4 IO pins so the next SEC board can plug into the SRAM boards..

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Tue Jan 28, 2020 4:25 pm

What about fitting an SMT Oscillator?
If it ain't broke, test it to Destruction.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 4:34 pm

PhilC wrote:
Tue Jan 28, 2020 4:25 pm
What about fitting an SMT Oscillator?
I do want to do that, but problem being like I had with the STE boosters, not all CPU's can overclock the same, and I don't know top speed unless I try it out on every CPU. So if I went SMT, I would have to do them all as 50MHz and hope for the best.
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Tue Jan 28, 2020 4:37 pm

exxos wrote:
Tue Jan 28, 2020 4:34 pm
PhilC wrote:
Tue Jan 28, 2020 4:25 pm
What about fitting an SMT Oscillator?
I do want to do that, but problem being like I had with the STE boosters, not all CPU's can overclock the same, and I don't know top speed unless I try it out on every CPU. So if I went SMT, I would have to do them all as 50MHz and hope for the best.
Yeah I did think about that. I've only tried the one SEC the you've sent me and will get myself some other oscillators to test on it but so far it looks good for either 32 50 and 64. So not too much messing around if you change them with hot air. Obviously not as easy as through hole though.
If it ain't broke, test it to Destruction.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 4:45 pm

PhilC wrote:
Tue Jan 28, 2020 4:37 pm
Yeah I did think about that. I've only tried the one SEC the you've sent me and will get myself some other oscillators to test on it but so far it looks good for either 32 50 and 64. So not too much messing around if you change them with hot air. Obviously not as easy as through hole though.
I am hoping 64 will work on all. Though trying 3 oscillators may not sound much, but do it like 50 times and .. well.. nope :)

I may see if I can put the SMT footprint on the rear of the PCB though anyway.
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 5:08 pm

Managed to squash it under the DIP OSC. Also moved it all to the right so I can try and route the 4 pads to the PLD for the SRAM controls.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Tue Jan 28, 2020 5:15 pm

Now that looks like a plan.
If it ain't broke, test it to Destruction.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by Icky » Tue Jan 28, 2020 7:20 pm

exxos wrote:
Tue Jan 28, 2020 5:08 pm
Managed to squash it under the DIP OSC. Also moved it all to the right so I can try and route the 4 pads to the PLD for the SRAM controls.
Nice! :thumbup:

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 7:28 pm

Managed to squash it all in..

Need to tweak the firmware as I moved a load of pins around on the PLD :roll:

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EDIT:

For those not keeping up, those 4 headers are the IO drive to the fast-ram board... viewtopic.php?f=18&t=1789&p=21813#p21813
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Jan 28, 2020 8:04 pm

@Icky Did a render of the fast-ram boards a while ago... I am still waiting for these to come back from fab :roll:

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