17 September 2022, 23:41 | #81 |
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Nice, looks like now is a good time to refurbish the good old A2000!!
Chris |
18 September 2022, 00:06 | #82 | ||
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18 September 2022, 00:09 | #83 | |
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you can't ignore two things - something need be designed in advance to be produced and later available on market so 1 year difference is huge amount of time when comparing products (it is more appropriate to check available config for 1991/1992 than one year later). second thing is also important - most of listed VGA/SVGA chips doesn't support any HW acceleration (except linear addressing), they are more primitive than old uPD7220 - some PGC/IBM 8514 successors (ATI MACH, S3) are equipped with HW acceleration but still they popularity is limited (limited software usage of the HW acceleration) - those chips are used mostly as framebuffer - there is limited number of drivers (mostly Windows and AutoCAD, sometimes other DOS software like editors, spreadsheet etc). For many PC users those cards are simply not different than plain VGA/SVGA. So graphic performance is limited by CPU and bus type... this is completely opposite to Amiga where you get HW acceleration supported in each software you can imagine just out of the box (perhaps except poorly migrated multiplatform titles). In fact PC software doesn't use HW acceleration so widely until Windows 95... where WinG/DirectX begin to be truly popular. |
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18 September 2022, 02:32 | #84 |
mä vaan
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It is nice that they have made this possible, but only important question is "when I can buy one?".
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18 September 2022, 07:12 | #85 |
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Hell, I'll take the whole set, can't find the pic but "Take My Money"....
Chris |
18 September 2022, 08:06 | #86 |
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18 September 2022, 08:25 | #87 | |
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18 September 2022, 08:51 | #88 | |
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If they only put out the 1200 a year or two earlier and had a few good devs really put its resources to good use... On topic, I really love what you are doing here. Feels more Amiga to me than putting in a card that does RTG and a fast CPU. YMMV off course. No chance of this coming to the A600 I guess? Would so love to have an AGA capable 600 sitting on my table. |
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18 September 2022, 09:10 | #89 | |
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Looks as it would be a bit better than a stock A1200. and you have not even added a good 030/50 accelerator on it yet! Chris |
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18 September 2022, 17:38 | #90 |
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Mostly, it's not 100% simply because we can't magically give CPUs a 32-bit bus to chip RAM. The 3000 will probably be the MOST compatible because of this. So there are a couple of shortcomings and some bonuses. In a nutshell, CPU access will be a little worse, but chip access will be a lot better and we're hoping that the balance of this provides good compatibility.
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18 September 2022, 18:28 | #91 | ||||
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Our general plan is: 1. get drop-in ECS compatibility working first, this should allow any combination of Agnus, Denise and Paula to work with Willoe, Faith or Harmonie with zero compatibility issues 2. add in the 2x and 4x prefectch modes with compatible chips so get Willoe-to-Faith communication working at 2x and 4x; get Willoe-to-Paula-and-back communication working at 2x and 4x; this will remain at ECS feature level though and should still work as drop-in replacements for any chip combination 3. add in AGA compatiblity; wide-sprites, HAM8, etc Since I made a sort of "universal" DIP board, this design can be easily adapted to any DIP 48, 40 or 28 chip, so we're also planning on making ROMs with in-system reprogramming, 6502's, CIA chips, etc. Some of this may be in parallel, some may not. Adapting this to a smaller PLCC-52 footprint is easy. One of the great things about our design is that there are no series-resistors or level shifters eating up board space. Basically, drop in a two-channel regulator, some capacitors and we're good. |
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18 September 2022, 18:30 | #92 |
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On 16-bit machines, the CPU will have less bandwidth than AGA does but the chipset will have more, so be sure to disable FBLIT like extensions.
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18 September 2022, 22:09 | #93 |
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Does the new memory nudge into Zorro 8 meg space, I only use 4 meg max anyway but curious. I know nothing about the addressing here.
Chris |
19 September 2022, 17:15 | #94 | |
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19 September 2022, 17:49 | #95 | |
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If you install Xander, then you can have up to 2MB on all systems. If you then enable 4MB or 8MB of chip, then yes, that would cut into Zorro RAM as chip RAM is always contiguous (e.g., all 8MB would need $000000 to $7FFFFF). |
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21 September 2022, 11:26 | #96 |
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Jeroen Vandezande of the Blegian Amiga CLub has done a socketed version of the A1200
https://www.amigaclub.be/projects/amiga1200plus Would it be practical to do versions of these chips and do 32-bit/AGA chip replacements from them? Or another idea, would it be possible to do 32-bit versions of these and build a replica A1200 board from them? Not asking you to do that btw, just curious. |
21 September 2022, 13:36 | #97 | |
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Really looking forward to putting a full set of replacements in at least one of them! by the way: How will this play out with Amber? I guess it will be obsolete and there will be some breakout on Faith itself? Or could we replace Amber with some better version as well? (thinking of Graffiti, HAM-E, DCTV functionality ...) Last edited by Gorf; 21 September 2022 at 13:42. |
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21 September 2022, 15:07 | #98 |
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Sorry if I missred something or for my ignorance, but where are we in the development of this project (Willoe) ? Beginning, middle or close to the end ? I cannot find the info.
Congratulations for this project that I will foloow for sure. |
21 September 2022, 17:22 | #99 | ||
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Willoe is built, code is being worked on, Nonarkitten is better to give an approximation of completion. The Willow project is intertwined with some other projects. Here is info on Faith... http://eab.abime.net/showthread.php?...30#post1565930 Quote:
Last edited by kipper2k; 21 September 2022 at 17:30. |
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21 September 2022, 18:15 | #100 |
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If the board that has been built is based on this schematic then it is missing a PLL, which is probably needed for the logic to work (I pointed this out to nonarkitten earlier).
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