05 August 2012, 13:56 | #121 |
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Why would like to use the expansion port? The A500 is already (too) large.
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05 August 2012, 14:01 | #122 |
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I would like nothing...
You have better to read the topic instead of asking for things already answered. |
05 August 2012, 14:01 | #123 |
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I would prefer "you are on your own" and experiment with A570/A590/GVP and others...
Not to mention the zorro adapter available for the side port. |
05 August 2012, 14:52 | #124 | |
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Quote:
Remove the 68000,then plug kippers2k ram card, and on top of that, plug aca 500! In that case, fast ram will also comunicate directly with the aca 500's cpu at full speed of 14Mhz, isn't that right? Man, we are talking about serious stuff here... Multi floor amiga 500! |
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05 August 2012, 15:08 | #125 |
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I'm not sure, because it look that the new CMOS CPU, the IDE controller and the embedded RAM may be located on the riser card... (I don't see them on the main board shown on the first page)
Anybody can answer? |
05 August 2012, 16:53 | #126 | ||
electricky.
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Quote:
Quote:
Jens |
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05 August 2012, 17:08 | #127 |
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Thanks for clearing this up!
So if i get this right, once installed aca 500 you CANT USE ANYTHING ELSE (add on memory cards like keeper2k's,possibly other cards pluged on 68000 socket, or anything on the 86pin connector) except from trapdoor ram [YES] [NO] ? Btw, have you tested whdload with aca 500? Can the 68000/14mhz with 2mb ram, really handle whdload games, without any speed penalty? I'm asking this because if i'm going to buy this card for my Amiga 500, will be EXACTLY for that! Having the ability to enjoy at last, many multi disk games through whdload, without the endless disk loading and swaping! Last edited by ikonsgr; 05 August 2012 at 17:21. |
05 August 2012, 19:35 | #128 | |
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Toni has explain that in the afternoon. It's not exclusive to Paula. Sorry. |
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07 August 2012, 10:28 | #129 |
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Will be watching this space :-) Zeus68k / ACA500 very exciting times :-)
Hopefully will have enough saved for the release date, don't want to miss out :-/ |
16 August 2012, 17:54 | #130 | |
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Quote:
In summary B1220 default 28mhz = 4851 ACA1220 16.67mhz = 3321 ACA1220 25mhz OC = 4262 For me, I'd be happy with an OC ACA1220 with all that extra Ram!! Would have been a nice feature if Jens had given us a jumper block rather than needing to solder a wire in place (mk2 maybe???) |
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16 August 2012, 20:09 | #131 |
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A1220 MK2 with 28MHz 020 and a heatsink would be top stuff.
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16 August 2012, 20:12 | #132 |
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Only 1/2 and 1/3 divider from the 50MHz clock...
What can you do better with 3 more MHz in true??? EDIT: OK, reading the next post it's no more the case. Last edited by TotO; 16 August 2012 at 20:41. |
16 August 2012, 20:20 | #133 |
electricky.
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Thanks for those values. I have optimized chipmem access further, and I have found that I'm flushing the caches too often. The mass-produced board has a slightly different wiring for the logic chips, so I can precisely identify if I need to flush caches or not (to experts: Function code lines were pre-decoded in the other CPLD, and are now wired directly to the memory controller). This has already helped performance on the ACA620, and it'll bring the ACA1220 higher as well.
Further, I have decided to not use a canned oscillator, but a PLL to generate the main frequency. The PLL is kind-of programmable with SMD resistors (bridges). This will make overclocking easier, but I won't get tired to emphasize that overclocking is done at your own risk. Memory design is overclocking-friendly, but the CPU is rated 16MHz by Motorola, so that's the highest frequency I will guarantee Jens |
16 August 2012, 20:39 | #134 |
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OK, now the clock change not the divider... So, not only the CPU will run faster but the memory too.
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16 August 2012, 21:07 | #135 |
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So it looks like we'll have a ACA1232 card based on the ACA1220 design, that's nice.
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16 August 2012, 21:07 | #136 |
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I'd say it's a good idea to leave it for hardware mods, rather then jumper blocks, as it means the step to voiding your warranty is slightly larger. Also, it's slightly easier to see if someone fiddled with the pads, when your getting a fried accelerator back, and the buyer claims warranty.
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16 August 2012, 21:18 | #137 |
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16 August 2012, 21:54 | #138 |
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17 August 2012, 09:48 | #139 | ||
electricky.
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Quote:
Quote:
Jens |
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17 August 2012, 10:23 | #140 | |
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Quote:
Sure, it's always possible to hack the divider to 1/2, but it's not interesting because the available range are close and the user will lose much memory speed and risk to permanently damage the CPU, using a wrong jumper setting. But for the predicted ACA1232 Board, it may be interesting to switch it to 1/3 if it embed a 25Mhz certified CPU. Allowing to increase the RAM speed from 50MHz up to 80Mhz for a close frequency. Last edited by TotO; 17 August 2012 at 10:45. |
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