11 February 2020, 18:26 | #121 |
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Just playing Thinking ahead a bit
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11 February 2020, 20:03 | #122 |
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Can anyone suggest/recommend an intense a500 ocs/ECS demo, that can give idea of performance.. (already have SOTA)
thanks |
11 February 2020, 20:31 | #123 |
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My go-to performance test when tinkering with the Minimig was the game Zeewolf 2 - it makes good use of Fast RAM when available, and falls over quickly if the RAM or cache is buggy, so it's a good smoke-test too.
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11 February 2020, 20:36 | #124 |
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The intro sequence for Frontier:Elite 2 is a pretty good benchmark as well.
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11 February 2020, 21:03 | #125 |
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I was using ADoom for stability tests on mine. Just leaving it running on a high screen res (or as high as you can) and leave the demo looping
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11 February 2020, 21:59 | #126 |
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Pressing the nuke button in Lemmings when you have a 100 of them out...
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11 February 2020, 23:06 | #127 |
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12 February 2020, 16:38 | #128 |
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Morning All,
Thanks for the demo suggestions. Mike is tweaking the glue logic and the results are very good, games and demos we have tried appear to be very fluid and performance is great. Mike will update when the next phase is done. For the A600 i have designed an adapter board that should work regarding the physical fit, we are adding a logic cct to it to allow the onboard CPU to be enabled /disabled. |
12 February 2020, 20:42 | #129 |
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Is the adaptor board also going to be closed source?
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12 February 2020, 21:30 | #130 |
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12 February 2020, 22:37 | #131 |
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13 February 2020, 16:32 | #132 |
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i was referred to this link to solve a600 bus contention, we haven't proved it yet ...
https://retrocomputing.stackexchange...elerators-work |
13 February 2020, 20:59 | #133 |
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Kludge had it working with some boards just by tying BR and VPA to ground on the A600 CPU side and to 5v on the accelerator side. There's more info on it over on the Exxoshost forum.
There's plenty of documentation online regarding 68000 bus arbitration though, and what is required, and the signals involved |
13 February 2020, 21:22 | #134 | |
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Quote:
Something to perhaps be aware of is that the 68000 will carry on and complete the current bus cycle after /BR is pulled down (not sure what happens if it is already low when RESET/HALT are released), and it even asserts /BG a tick or two before it actually releases the bus. To avoid a potential conflict at the point of handover I think it would be sensible to have the accelerator held off until a short period of time after the motherboard 68000 has asserted its /BG output, just to be sure the bus has really been released. Mike |
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13 February 2020, 21:39 | #135 |
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Here is design layout (beta) for the A600 CPU converter PCB, It is still missing little logic cct but for the most part it is pretty well complete
it can use the Rom socket as an anchor and also use a screw on the left side of the PLCC socket, should be rock solid Last edited by kipper2k; 13 February 2020 at 21:45. |
13 February 2020, 21:51 | #136 |
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Awesome stuff
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13 February 2020, 22:44 | #137 |
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that looks brilliant the converter. It makes a lot of sense, as it would allow the 600 to use all sort of a500 accelerators.
There are alot of alternative cases now too. |
13 February 2020, 22:51 | #138 | |
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Thanks Once the converter board is connected. Your A600 will still work whether or not an external board is attached so no need to remove |
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13 February 2020, 23:08 | #139 |
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I really like the progress that is being made here, particularly for the much maligned A600. Sadly it looks like if I were to use this design, I'd have to get someone to desolder my ROM and drop in a socket, as my A600 is one of those weird ones with the 37.350 ROM directly soldered to the mainboard.
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13 February 2020, 23:11 | #140 | |
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Quote:
edit: you would need to ask for one without the pin header for the rom so it doesnt interfere Last edited by kipper2k; 13 February 2020 at 23:35. |
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