10 May 2024, 06:36 | #4141 | |||
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Bridgette's purpose in the A4000 is cost reduce A3000's several TLL chips bridging CPU bus and Custom Chip bus. Bridgette's purpose 1. Bridge CPU bus to Custom Chip Bus 2. Bridge CPU bus to expansion bus. R&D resources were wasted on "A1000Jr". Quote:
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A590 has SCSI and XT IDE interfaces with DMac DMA chip and memory controller for Fast RAM. A600's IDE is just 1986 era PIO Mode 0. Reference http://www.kaiiv.de/servicemanuals/A...Schematics.pdf |
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10 May 2024, 06:41 | #4142 | |
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Read A600's schematics on "byte swapped" with PCMCIA. You didn't get the purpose for Bridgette cost reduction against several TTLs. A600 has less profit margin when compared to A500. Last edited by hammer; 10 May 2024 at 06:46. |
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10 May 2024, 06:42 | #4143 | |
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Combine that boneheaded port placement with the squishy keys, stupid angled function keys and vent slots, and the ugly graunchy mouse, and you have a machine that just isn't nice to use. BTW if I see another ST with the mouse cord hanging down over the front of the desk I will spew. |
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10 May 2024, 07:13 | #4144 | |
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One of the projects I am looking at doing is a PCMCIA 'breakout' board for experimenting with various devices. I will be using the A600 for this because I would rather not blow up any of the custom chips in my A1200. If I damage a 74LS245 it's not a problem because they are readily available and dirt cheap (I have dozens of them salvaged off old PC motherboards). |
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10 May 2024, 07:14 | #4145 | |
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https://archive.org/details/AmigaFor.../n235/mode/2up 239 of 310, Jan 1992 GVP Series 2 Hard Disk Controller Frame is 169 UKP. ICD's AdSpeed/IDE is the low cost option for A500. |
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10 May 2024, 07:18 | #4146 | ||
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There are several TTLs that Bridgette has replaced. Not a major issue for my A1200 when I don't experiment with PCMCIA. Quote:
Last edited by hammer; 10 May 2024 at 07:47. |
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10 May 2024, 07:22 | #4147 |
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Commodore's goal? They didn't know it at all!
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10 May 2024, 07:31 | #4148 | |
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I mean, to this day I'm unsure if it's "just me" or is it what's happening to everybody? Because I have only used ST via FPGA, so not with a native mouse, and my real ST has an adapter for USB mouse, so also not native, and so maybe it's the user (ie me) error? |
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10 May 2024, 07:33 | #4149 |
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What should happen with relatively low risk:
1. A500 with IDE. Modified Gary into Gayle with IDE. Surface Mounted Chips can be applied. 2. A300 replaced C64c. ------------- Real timeline: 1. A300 evolved into A600 with PCMCIA and IDE. A600 has a higher manufacturing cost and less profit for Commodore when compared to A500. 2. Cancelled A500. 3. A600 was a sales flop. |
10 May 2024, 07:34 | #4150 |
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@hammer
Sorry Mate, but we know that datas, you're always post them: why? I don't get the point,a nd I would like to |
10 May 2024, 07:39 | #4151 |
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10 May 2024, 07:46 | #4152 |
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@hammer
A ok...Thanks |
10 May 2024, 08:20 | #4153 |
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They both are on a mission. Not sure either will ever be accomplished, but there we are.
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10 May 2024, 08:33 | #4154 |
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@TCD
Gotcha! |
10 May 2024, 18:37 | #4155 |
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Thanks all for the explanations about Jeff Franck and Jeff Porter. However Ali being the top manager, he can't be completely cleared.
It's certain that without drivers PCMCIA was useless. So it lead once again to the question why they did half the job? Why they didn't sold PCMCIA cards with the good driver at the launch of the A600 and A1200 !?? Would have be a very good point to market the machine and have articles written about this. They were not big enough to have the specs or what? And selling extensions is a good way to make bucks. So for me Ali can be blamed to have miss organized all that and not required the drivers from his team. Thanks @Hammer for David Pleasance's book extract and the Intel video. I don't know how you manage to have all that in mind! Finally do we know why the A600 was more expensive to manufacture than the A500? From what is said here, there was some TTL added to manage the IDE, the IDE connector and the PCMCIA connector. I don't understand how it can overtake the gain of the CMD process and the remove of the numeric pad. |
10 May 2024, 18:54 | #4156 | |||
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Tastes and colors
That said, over time, I've come across a lot of people who preferred the ST design in the Amiga community, like me. And despite everything, the design of the case is not everything, since I preferred to take an Amiga for what was inside. Quote:
But, in many ways the hardware inside is what should have been in the new generation of Amiga (chunky display, more sound channels (16 bit sound) and in addition a DSP). From my point of view, the Atari teams did their job better than those from Commodore on this generation (expect for the 030 on a 16 bit bus). Quote:
However, on another forum I had many discussions with the Falcon community about the DSP and also the comparison with the DSP3210. DSP connoisseurs explained me that the choice of the DSP3210 for the Amiga was quite curious. It is a scientific DSP at its core (floating calculations). To be equivalent in performance (MIPS) to Motorola's DSP 56001, it had to operate at higher frequencies. They also explained to me that Motorola's DSP was already well known at the time and therefore it was quite easy to find already well documented code for this DSP. The DSP3210 seemed less common and therefore less easy to program at first glance. Regarding Commodore's choice of DSP 3210. In reality Dave Haynie didn't look far as explained here : https://www.a1k.org/forum/index.php?.../76673/page-97 It's more of a coincidence that they thought of DSP in the Amiga. In fact, it was an Amiga user passionate about astronomy who had started to create a DSP card (AT&T DSP32) for his Amiga 2000 and who was friends with someone who had experience at Commodore. With the help of Commodore technicians he was able to build his DIY DSP32 card. Following this a meeting between AT&T and Commodore was arranged. After a demo, it was decided that the DSP3210 would be integrated into the future Amiga. But, it does not actually appear that the engineering teams have compared with others DSPs on the market. So maybe another DSP would have been better or more suitable. Motorola had a floating point DSP also, the 96000. Maybe it would have been as good or better? Perhaps software support would have been more widespread ? https://en.wikipedia.org/wiki/Motorola_96000 Do not be mistaken, I don't say that I wouldn't have been happy to have a DSP3210 in the Amiga. I've already said that I waited until the end for the DSP card promised for the 1200. It's just that if the DSP was considered in the Amiga, to me, it seems to me more of a coincidence than a real study about DSP advantage. I was very happy to learn about the recreation of the AA3000+ including the DSP and even happier to discover that enthusiasts had succeeded in making the DSP work. Quote:
Yes, the 3000 case for sure has style. But, from my point of view, it is a serious mistake not to have ensured that this case would be physicaly compatible with the flagship product (the videotoaster) which make miga desktops success in the United States. The Amiga 3000 was supposed to be the replacement for the existing desktop range, and this product can't fit the Videotoaster ! Proof that it was a serious mistake, Commodore will be forced to continue producing Amiga 2500 just for the Videotaoster. The link about the A2631 card show Dave Haynie must have half-heartedly admitted that in the end the 3000 was perhaps not as good design as he thought. |
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10 May 2024, 20:22 | #4157 | |
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The integrated flicker-fixer was of course a hack and should have incorporated the Hadley-Device, which would have given real high resolution options for CAD and ray-tracers ... A follow-up AA3000 as soon as the chips were ready (a whole year before the A4000) would also have made some impact. The technology was already there, but management missed the opportunity. |
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10 May 2024, 21:14 | #4158 |
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Why are almost all mad for DSP? Numbers aren't actual performance
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10 May 2024, 21:22 | #4159 | |
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In the early 90s DSPs had a nice window of opportunity until CPUs got powerful enough to make them obsolete. For a self proclaimed multimedia machine the inclusion of a DSP would have been a logical step. |
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10 May 2024, 21:26 | #4160 |
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@Gorf
Amiga need better HW capabilities first..Maybe Dsp would have been great on A4000, but I would have add a PPC, that would have been useful |
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