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SainT

Upcoming Jaguar Game Drive Cartridge

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17 hours ago, rdemming said:

I do not know what bank-switch layout Saint used

Any of the 6x1MB banks at $800000-$D00000) can point to any of the 16 available banks in the SD "cart rom" - it is glorious :)

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1 hour ago, CyranoJ said:

Any of the 6x1MB banks at $800000-$D00000) can point to any of the 16 available banks in the SD "cart rom" - it is glorious :)

Well thats cool. How fast is accessing that vs main system memory?

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8 minutes ago, zezba9000 said:

Well thats cool. How fast is accessing that vs main system memory?

 Same speed as rom

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1 hour ago, SCPCD said:

and RAM is 2 cycle and ROM is 5 cycles min.

ROM is always 10 cycle for JagSD use (ie. standard commercial game spec).

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7 hours ago, SainT said:

ROM is always 10 cycle for JagSD use (ie. standard commercial game spec).

This is a hardware constraint or it can be lowered by software?, maybe it can be nice to have 1 cycle access time and put textures there instead of RAM.

 

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1 cycle isn't possible ; the speeds supported by the hardware are 2, 5, 6, 8 and 10 cycles. And 2 cycles is partially broken. Support for 5 cycles would be nice to give a speed boost to JagSD-only games.

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3 hours ago, Zerosquare said:

1 cycle isn't possible ; the speeds supported by the hardware are 2, 5, 6, 8 and 10 cycles. And 2 cycles is partially broken. Support for 5 cycles would be nice to give a speed boost to JagSD-only games.

OMG, do you mean that the Jaguar has hardware bugs? 😂

Edited by swapd0
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6 minutes ago, swapd0 said:

OMG, do you mean that the Jaguar has hardware bugs? 😂

Nope!

 

;-)

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8 hours ago, Zerosquare said:

1 cycle isn't possible ; the speeds supported by the hardware are 2, 5, 6, 8 and 10 cycles. And 2 cycles is partially broken. Support for 5 cycles would be nice to give a speed boost to JagSD-only games.

I don't believe it's possible, its pushing it a bit at 10. I'm using SDRAM, so there is some latency in random reads -- it's better suited for burst reads. Plus you have the refresh cycles to take into account for latency and the fact memory access is asynchronous, so there's no waiting for the cart ROM to return the correct value. You either get it there in time, or everything dies.

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12 hours ago, SainT said:

I don't believe it's possible, its pushing it a bit at 10. I'm using SDRAM, so there is some latency in random reads -- it's better suited for burst reads. Plus you have the refresh cycles to take into account for latency and the fact memory access is asynchronous, so there's no waiting for the cart ROM to return the correct value. You either get it there in time, or everything dies. 

Oh, the JagSD does not support 5 cycles rom access ? You did not test it?

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21 hours ago, SainT said:

I don't believe it's possible, its pushing it a bit at 10. I'm using SDRAM, so there is some latency in random reads -- it's better suited for burst reads. Plus you have the refresh cycles to take into account for latency and the fact memory access is asynchronous, so there's no waiting for the cart ROM to return the correct value. You either get it there in time, or everything dies.

That's unacceptable. I demand to get my money back!

 

 

Wait...

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9 hours ago, DEATH said:

Oh, the JagSD does not support 5 cycles rom access ? You did not test it?

Everything we have tested (and, believe me, that is a LOT) has worked.

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7 minutes ago, CyranoJ said:

Everything we have tested (and, believe me, that is a LOT) has worked.

Yes, it's my old mantra of supporting the software which exists, not the software that doesn't. It really helps to cut down the workload! :)

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11 hours ago, SainT said:

Yes, it's my old mantra of supporting the software which exists, not the software that doesn't. It really helps to cut down the workload! :)

It's like I was always told as a software developer - solve the problems you have, not the problems you don't have. ;-)

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A much enhanced version shall be waiting for you to test your shiney new SD cart with :)

 

320x200x4bpp + 21.9Khz 16 bit ADPCM audio
 

 

Video shows upload speed over USB

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15 minutes ago, LianneJaguar64 said:

Whoa, not reading through 97 pages... Can I get the cliffs notes version? 😁

Sure. There's an upcoming Jaguar SD cartridge.

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3 hours ago, madman said:

Sure. There's an upcoming Jaguar SD cartridge.

And there's no pre-order list, nor will there be one.

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11 minutes ago, flip said:

And there's no pre-order list, nor will there be one.

Well, not quite true! I’ll be opening orders when I have the first load ready to ship, then any orders which can’t be fulfilled by the initial stock will be pre-orders to be fulfilled. I’m trying my hardest to keep the backlog as small as possible and keep orders fresh with the JagSD.

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On 8/10/2019 at 11:53 PM, CyranoJ said:

A much enhanced version shall be waiting for you to test your shiney new SD cart with :)

 

320x200x4bpp + 21.9Khz 16 bit ADPCM audio
 

 

Video shows upload speed over USB

I have to quote that so I don't have to go back a page.

 

Unleash the Jag. I don't think I've tracked a thread on Atariage that has got me so excited before.

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