CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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

Post by PaulJ » Mon Nov 19, 2018 2:28 pm

Forgottenmyname wrote:
Mon Nov 19, 2018 11:30 am
Will let you know when I get my hands on one. Aren't the CPU sockets the other way round? So should clear it?
Looks like it will fit because the major over hang is toward the prom chips. The issue looks like the fast rom card will conflict. We can make that work.

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

Post by JezC » Mon Nov 19, 2018 3:29 pm

exxos wrote:
Sun Nov 18, 2018 11:26 pm
https://www.mouser.co.uk/ProductDetail/ ... xJG56nE%3d

Only really those as a option.. has to be 5V... no 16bit, so have to use 2 of those for 16bit. either TSOP or PLCC.... PLDD is cheaper.. I guess it depends which is easier to physically fit on the PCB.
Well, if the programming algorithm for those is the same as the AMD29F040, it might be pretty easy...those are the first flash devices l used almost 30 years ago... :lol:

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

Post by PhilC » Mon Nov 19, 2018 5:29 pm

PaulJ wrote:
Mon Nov 19, 2018 2:28 pm
Forgottenmyname wrote:
Mon Nov 19, 2018 11:30 am
Will let you know when I get my hands on one. Aren't the CPU sockets the other way round? So should clear it?
Looks like it will fit because the major over hang is toward the prom chips. The issue looks like the fast rom card will conflict. We can make that work.
It's got on board Rom and Flash, so no more fast rom board required :-)
If it ain't broke, test it to Destruction.

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

Post by PaulJ » Mon Nov 19, 2018 8:20 pm

Forgottenmyname wrote:
Mon Nov 19, 2018 5:29 pm
PaulJ wrote:
Mon Nov 19, 2018 2:28 pm


Looks like it will fit because the major over hang is toward the prom chips. The issue looks like the fast rom card will conflict. We can make that work.
It's got on board Rom and Flash, so no more fast rom board required :-)
Initially exxos wan't going to put the rom on but just a decode line out to the fast rom board. I haven't been watching that close so its nice he added the rom on. :excited: :excited: :excited:

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

Post by PaulJ » Mon Nov 19, 2018 8:22 pm

Mega has the 1.5 in a socket so it will be quick swap. One question though, will the mega still need the 16 mhz clock cleanup board or is that handled on the booster also?

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

Post by exxos » Mon Nov 19, 2018 8:24 pm

PaulJ wrote:
Mon Nov 19, 2018 8:20 pm
Initially exxos wan't going to put the rom on but just a decode line out to the fast rom board. I haven't been watching that close so its nice he added the rom on. :excited: :excited: :excited:
I think you are confusing this SEC booster with the V2.2. booster... The V2.2 booster needs a external ROM board now..
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Mon Nov 19, 2018 8:27 pm

That is a good question. I can see there is an oscillator on the board but wouldn't be surprised if we would still need the buffer board so it plays nicely.
Is all the Ram, Rom and Flash run at the same speed as the CPU Exxos?
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PaulJ » Mon Nov 19, 2018 8:32 pm

Could be, I see an 68000 dip foot print it works for me. I'll take a 2.2,2.5,2.7,3,1,9.2... what ever you put on your site as long as it plugs into a 64 pin dip... :excited: :excited: :excited: :excited:

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

Post by exxos » Mon Nov 19, 2018 8:34 pm

Forgottenmyname wrote:
Mon Nov 19, 2018 8:27 pm
I can see there is an oscillator on the board but wouldn't be surprised if we would still need the buffer board so it plays nicely.
The SEC booster wouldn't need the MEGA ST buffer board.

Forgottenmyname wrote:
Mon Nov 19, 2018 8:27 pm
Is all the Ram, Rom and Flash run at the same speed as the CPU Exxos?
Yes, for arguments sake, all at 50MHz.
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Tue Nov 20, 2018 11:10 am

OK so I labeled stuff up..

Capture.JPG
Capture.JPG (175.82 KiB) Viewed 1114 times


As said before, eventually the PLCC ROM will go, but not during these prototype testing phases (plus no software to program the flash so one reason the PLCC remains there).

The flash is 45ns, ROM 55ns, So the likely maximum speed is 50MHz. As tested before, the CPU maxed out at 58MHz anyway.

It is a "stand alone" board so nothing else is needed to make it work. BUT if fitting on a MEGA ST/STF/M it will need the 10K SILs changing to 2.2k. We already have 2.2K on the STF remake (or 4.7K is fine there also).

Ultimately this booster will be integrated on the STF remake board, but that is a long long way away. For the next MB revision, it will have a DIP 68000 CPU socket to plug this booster into the MB.

Longer ahead, the fast-ram won't be needed, the whole 14MB ST-RAM area will be "fast-ram" but that is long long way in the future.
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