13 October 2021, 11:16 | #101 | |
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If you are feeling experimental, this is what you could do:
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13 October 2021, 13:13 | #102 | |
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OK, for me this is more theoretical solution that actually doable. |
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13 October 2021, 13:17 | #103 | |
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I ques, I just put this to failed projects box. This is hobby project and I can't wait things to work out of the box. |
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13 October 2021, 15:23 | #104 | |
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Just to be clear, this mod is to get DMA running when you combine this accelerator with one of the GVP SCSI side cars. Your problem is different. I do not see an immediate technical reason why this accelerator would not work with the IDE68K. I have yet to study the ABEL design but in principle it should work as the IDE68K does not do DMA. |
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13 October 2021, 15:46 | #105 | |
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Basicly, I tried this board with two HD contorollers, IDE68K and GVP HD8+. |
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17 October 2021, 20:48 | #106 |
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18 October 2021, 16:26 | #107 | |
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[EDIT] Maybe I should try to get ground some where else? What kind of voltage it should gave? Last edited by utri007; 19 October 2021 at 09:20. |
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19 October 2021, 10:56 | #108 | |
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You should read somewhere around 2.5V ideally. The closer to 2.5V, the better your 14MHz clock is. I was thinking that maybe your card does not work with the IDE68K is because of a bad 14MHz clock. You can also get ground from the EMC shield. |
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20 October 2021, 23:41 | #109 |
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22 October 2021, 08:01 | #110 |
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That is very low. I need to check my old measurements to come up with a different resistor value for the PLL. The low value of 1.6V means that the dutycycle of the clock is not 50%. This influences the timing and may thus be a reason that it does not work well with the IDE68K.
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25 October 2021, 15:55 | #111 |
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I released a video on this card yesterday. There are a fair few comments from people asking were to get one, I don't suppose anyone is building them at present or knows of someone who is?
One other question that's getting asked is, why is the fast ram mapped to the slow ram address space? I don't suppose anyone could provide an answer to this and using small words so I can understand lol. |
25 October 2021, 18:21 | #112 | |
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Oh thats you! Great video and love your channel too I was surprised at how much of a boost this gives. Its just a shame there isnt more RAM (even just 4MB) and IDE |
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25 October 2021, 20:00 | #113 | |
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Yep that's me, glad to hear you enjoy the channel. It certainly is a nice card and performs a lot better than I was expecting. I'm going to build the ide68k to sit under it and I'm hoping it works with a trap door chip ram mod. If I can get 1mb chip and the 1mb on this it'll be enough. |
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25 October 2021, 21:14 | #114 |
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25 October 2021, 22:48 | #115 |
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26 October 2021, 08:20 | #116 | |
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The kickstart automatically detects ram in this area (up to 1.75MB with 3.1 ROM),and adds it to the memory pool before boot. If this was not the case, and you had to add the memory during boot, some stuff would go into chip-ram, which is slower. Also, this ram is real fast-ram as it is implemented correctly on the cpu side in this case. It would only be slow if put it behind Agnus, in the trapdoor, like with regular 0.5MB cards. |
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26 October 2021, 11:38 | #117 | |
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28 October 2021, 19:58 | #118 | ||
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Your comment about it being the perfect Dread accelerator made me smile. It could have been back in the day right? Sold as a bundle? I would have certainly wanted it for Sinterklaas back then! Quote:
Last edited by Mathesar; 28 October 2021 at 20:44. |
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28 October 2021, 20:34 | #119 |
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29 October 2021, 10:31 | #120 | |
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I hear varying reports about compatbility with the IDE68K. It works fine though with the trap door chip ram mod. (I did the same ) |
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