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| Accesing the Moonsound SRAM
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SaebaMSX
msx freak
Berichten: 253 |  Geplaatst: 31 Oktober 2005, 07:22 |
Hello there,
Anyone knows how to acces to the SRAM of our moonsounds? I think that it is not explained in the provided documentation (maybe it is just because the MB driver uses it).
I tried to find it around or ask other users with the same bad luck.
I just need info like Switching Address, memory ranges where it can be read/write, etc.
Thank you!
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 08:14 |
You can download the opl4 manual at www.msx.ch. The information you need is in that manual |
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SaebaMSX
msx freak
Berichten: 253 | Geplaatst: 31 Oktober 2005, 09:23 |
Maybe I was that blind... I will try to open that file again. 
Edited: Thank you! Now I will study it, I hope this SRAM can be accesed from the computer directly. |
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 09:24 |
And if you have any additional questions about it just ask. I've coded a lot for the opl4
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SaebaMSX
msx freak
Berichten: 253 | Geplaatst: 31 Oktober 2005, 09:45 |
Yeah, Anne told me about it. Now I am not going to use the OPL4 directly, but the SRAM chip, if it is possible.
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 11:46 |
You always have to access the sram trough the opl4. What are you going to do with it?
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SaebaMSX
msx freak
Berichten: 253 | Geplaatst: 31 Oktober 2005, 15:13 |
I'm afraid that I can't use this SRAM since I was said (thanks Manuel!) that it has no battery... 
I just wanted to use it as a normal Static RAM, but if the contents are not there after a reset I can't use it.
Thanks anyways. |
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 15:32 |
People more often asume that sram has a battery  . After a reset the content is still there,but not after a power off ofcourse. Why did you think it did have a battery? |
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SaebaMSX
msx freak
Berichten: 253 | Geplaatst: 31 Oktober 2005, 16:07 |
I assumed that each SRAM had a battery.
Hmm, if it has the contents after a reset it could be useful for me, but if I the SRAM has to be accessed through OPL4... :/
Believe, I don't need the OPL4, I just wanted to take profit of that SRAM.  |
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 16:10 |
never assume anything . btw the sram in a pentium (for example) also doesn't have a battery Why is it a problem that it has to be accessed to the opl4'? |
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SaebaMSX
msx freak
Berichten: 253 | Geplaatst: 31 Oktober 2005, 16:57 |
Because I am lazy...
But I will try to do it in the future if I have enough space... but now I don't want to check how it can be accessed through OPL4...
Maybe after having something "solid" I will do it using moonsound SRAM too... I have other possibilities now. |
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 17:27 |
well accessing the sram is propably easier then accessing the vdp
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Latok
msx master
Berichten: 1727 | Geplaatst: 31 Oktober 2005, 19:00 |
And the vdp doesn't have SRAM.
Ok, did I say something useful? Did I? Did I?
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msd
msx professional
Berichten: 612 | Geplaatst: 31 Oktober 2005, 19:45 |
latok: do you want a friendly answer or a real answer |
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[D-Tail]
msx guru
Berichten: 3018 | Geplaatst: 31 Oktober 2005, 20:59 |
Quote:
| And the vdp doesn't have SRAM.
Ok, did I say something useful? Did I? Did I?
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D'oh!! The VDP has VRAM, which stands for Video RAM!!
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