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Forum: Amiga scene 24 October 2021, 07:52
Replies: 1,185
Views: 216,641
Posted By Mathesar
Really, really cool these updates! These...

Really, really cool these updates!
These multiple height levels really look mindblowing.
Forum: Hardware mods 22 October 2021, 08:01
Replies: 116
Views: 13,151
Posted By Mathesar
That is very low. I need to check my old...

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...
Forum: Hardware mods 19 October 2021, 10:56
Replies: 116
Views: 13,151
Posted By Mathesar
You should read somewhere around 2.5V ideally....

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....
Forum: Amiga scene 18 October 2021, 13:25
Replies: 1,185
Views: 216,641
Posted By Mathesar
Thanks for the update! I never used Discord...

Thanks for the update! I never used Discord before, does it always need an app or does it also work via a browser?
Forum: Hardware mods 17 October 2021, 20:48
Replies: 116
Views: 13,151
Posted By Mathesar
Before throwing it in the bin... Could you...

Before throwing it in the bin... Could you measure something for me?
What is the voltage on the J2/14MHz testpoint?
Forum: Hardware mods 13 October 2021, 15:23
Replies: 116
Views: 13,151
Posted By Mathesar
Just to be clear, this mod is to get DMA running...

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...
Forum: Hardware mods 13 October 2021, 11:16
Replies: 116
Views: 13,151
Posted By Mathesar
You're right. the problem is that ~AS7 is not...

You're right. the problem is that ~AS7 is not tristated as it is driven from the HCT74.
If you are feeling experimental, this is what you could do:


implement a pseudo-tristate by making ~AS7...
Forum: Hardware mods 10 October 2021, 15:22
Replies: 116
Views: 13,151
Posted By Mathesar
That is the "right" order. So the fast RAM on the...

That is the "right" order. So the fast RAM on the ide board is working but the ide part is not? I don't think int2 is the problem, more a timing issue with dtack/address/ovr. Is the logic of mkl's...
Forum: Hardware mods 10 October 2021, 07:49
Replies: 116
Views: 13,151
Posted By Mathesar
I see no real reason why it wouldn't work. How...

I see no real reason why it wouldn't work. How did you stack the two boards? (what board is "under")?
Forum: Hardware mods 09 October 2021, 19:53
Replies: 116
Views: 13,151
Posted By Mathesar
The problem is DMA. Any DMA attempt by the GVP...

The problem is DMA. Any DMA attempt by the GVP will crash the system.
It is fixable but it requires a hardware mod.
Forum: Hardware mods 09 October 2021, 07:31
Replies: 116
Views: 13,151
Posted By Mathesar
Shouldn't mask be set to all zero to disable DMA...

Shouldn't mask be set to all zero to disable DMA altogether? Eg 0x00000000 ?
Forum: New to Emulation or Amiga scene 08 October 2021, 20:54
Replies: 4
Views: 624
Posted By Mathesar
Maybe I can help a bit. Is the socketed chip a...

Maybe I can help a bit.
Is the socketed chip a pic18lf252? If so than it is a very old version with limited harddisk support. It will work but very, very slow. To make it work you need to select the...
Forum: Hardware mods 29 September 2021, 20:07
Replies: 116
Views: 13,151
Posted By Mathesar
I am sorry to hear that yours is not working...

I am sorry to hear that yours is not working anymore. Can you check the voltage on the 14MHz test point? It should read in the neighbourhood of 2.5V. Maybe your card has a problem with the clock...
Forum: Hardware mods 29 September 2021, 20:03
Replies: 116
Views: 13,151
Posted By Mathesar
Nice video! Dread runs nice on it doesn't it? :D...

Nice video! Dread runs nice on it doesn't it? :D I'm glad you like it!
Forum: Hardware mods 27 September 2021, 16:25
Replies: 116
Views: 13,151
Posted By Mathesar
Yes, they can be overclocked quite a bit. Up to...

Yes, they can be overclocked quite a bit. Up to 50MHz sometimes.
But in this design it won't go faster than 14MHz.
Forum: Hardware mods 23 September 2021, 10:52
Replies: 116
Views: 13,151
Posted By Mathesar
Congratulations with your build :great Pictures...

Congratulations with your build :great Pictures or it did 't happen :D
For an HDD on the cheap to go with the accelerator, what about one of those SD to parallel boxes?
Forum: Hardware mods 23 September 2021, 10:46
Replies: 116
Views: 13,151
Posted By Mathesar
The problem is not so much with HD's but with DMA...

The problem is not so much with HD's but with DMA capable HD controllers. Currently the accelerator does not support DMA controllers at all. It could be fixed in an updated revision but currently I...
Forum: Hardware mods 18 September 2021, 18:32
Replies: 116
Views: 13,151
Posted By Mathesar
The picture is from an older revision. The...

The picture is from an older revision. The revision on GitHub doesn't need a solder patch!
Forum: Amiga scene 17 September 2021, 17:46
Replies: 1,185
Views: 216,641
Posted By Mathesar
Also forgot to mention, but the sound effects...

Also forgot to mention, but the sound effects have improved a lot since the "sound" video. In fact, they are really clean now.
Forum: Amiga scene 17 September 2021, 15:03
Replies: 1,185
Views: 216,641
Posted By Mathesar
That's the way to calculate it yes. The number is...

That's the way to calculate it yes. The number is the number of frames it takes to calculate a new frame.
Forum: Amiga scene 15 September 2021, 10:19
Replies: 1,185
Views: 216,641
Posted By Mathesar
I have 2 "real" Amiga's and both ran the demo....

I have 2 "real" Amiga's and both ran the demo. Either from floppy or from HD.
But really, when you have a "modestly expanded" Amiga, you probably had to do the "disable caches" trick before? Back in...
Forum: Amiga scene 08 September 2021, 10:43
Replies: 1,185
Views: 216,641
Posted By Mathesar
:laughing True, but I think the few red pixels on...

:laughing True, but I think the few red pixels on the enemies didn't disturb him I. Now, the more detailed 4K games like Doom Eternal on the other hand... I will definately not let him near those!
Forum: Amiga scene 08 September 2021, 09:11
Replies: 1,185
Views: 216,641
Posted By Mathesar
I finally ran Dread on my A500 as it is intended....

I finally ran Dread on my A500 as it is intended. I was running the A500 stock except for the CPU which is an 68010. Would that make any difference? I guess with unrolled loops it doesn't. Anyways,...
Forum: Amiga scene 06 September 2021, 12:54
Replies: 1,185
Views: 216,641
Posted By Mathesar
I disabled CPU caches and such. Then it worked.

I disabled CPU caches and such. Then it worked.
Forum: Amiga scene 06 September 2021, 12:54
Replies: 1,185
Views: 216,641
Posted By Mathesar
I was already in bed yesterday and thought: let's...

I was already in bed yesterday and thought: let's check EAB before sleeping.
Then found out about the demo. Needless to say I went out of bed, turned on the A3000 and downloaded the demo (manually...
Forum: Hardware mods 21 August 2021, 15:45
Replies: 116
Views: 13,151
Posted By Mathesar
My accelerator does not tristate AS7 currently....

My accelerator does not tristate AS7 currently. As for DTACK, you are right! Perhaps the easiest way to make this work is to just move the ram to zorro space and accept the speed penalty.
Doing...
Forum: Hardware mods 21 August 2021, 15:43
Replies: 116
Views: 13,151
Posted By Mathesar
Let me think aloud here. First thing to change is...

Let me think aloud here. First thing to change is to make AS7 a tristate signal when another busmaster is active. Easy in a CPLD but on this design it would mean an extra (tristate) buffer gate. Or...
Forum: Hardware mods 20 August 2021, 21:39
Replies: 116
Views: 13,151
Posted By Mathesar
I have raised an issue on GitHub. One thing I...

I have raised an issue on GitHub. One thing I just now realize is that this design does not tristate the AS signal when the 68000 grants bus access. This inhibits any DMA transactions on the 68000...
Forum: Hardware mods 20 August 2021, 14:18
Replies: 116
Views: 13,151
Posted By Mathesar
Could you do a test and see if the system boots...

Could you do a test and see if the system boots with just the $C00000 ram on the accelerator disabled? The A590 should be fully enabled with ram. This way we can check whether the problem lies with...
Forum: Hardware mods 18 August 2021, 21:16
Replies: 116
Views: 13,151
Posted By Mathesar
Just so I understand correctly, with the fast ram...

Just so I understand correctly, with the fast ram on the accelerator disabled ($C00000 ram), the system does not boot?
Forum: Hardware mods 18 August 2021, 16:04
Replies: 116
Views: 13,151
Posted By Mathesar
Also, the accelerar always runs @14Mhz. However,...

Also, the accelerar always runs @14Mhz. However, when it accesses the Amiga bus the cpu is slowed down so much tools that like Sysinfo will report a slower clock speed.
Forum: Hardware mods 18 August 2021, 14:52
Replies: 116
Views: 13,151
Posted By Mathesar
Cool :cool Glad that it works. It's a pity though...

Cool :cool Glad that it works. It's a pity though that it doesn't play nice with the A590. One thing to remember is that the fast ram on the accelerator is not DMA capable. that might be a reason for...
Forum: Hardware mods 18 August 2021, 14:37
Replies: 116
Views: 13,151
Posted By Mathesar
Have you build this card and is it working? I...

Have you build this card and is it working?
I have not received any feedback of people having succesfully build one.
Forum: Hardware mods 10 August 2021, 07:45
Replies: 116
Views: 13,151
Posted By Mathesar
The ram on this accelerator is actually fast ram....

The ram on this accelerator is actually fast ram. However, I mapped it to the address range of the slow/ranger ram @$C00000 so it gets autodetected without doing the whole zorro/autoconfig stuff. (I...
Forum: Hardware mods 02 August 2021, 15:02
Replies: 116
Views: 13,151
Posted By Mathesar
I'll do a THT version :-)

I'll do a THT version :-)
Forum: Amiga scene 02 August 2021, 11:13
Replies: 1,185
Views: 216,641
Posted By Mathesar
Another thing I was thinking of: in one of the...

Another thing I was thinking of: in one of the earlier demo's we saw of dread there was an outside map with ground area's that looked like water.
That would be real cool and maybe relatively easy to...
Forum: Hardware mods 01 August 2021, 07:13
Replies: 116
Views: 13,151
Posted By Mathesar
OOPS forgot what I said, the cheapest one in the...

OOPS forgot what I said, the cheapest one in the link is not a 5v part... :shocked
Forum: Hardware mods 31 July 2021, 19:15
Replies: 116
Views: 13,151
Posted By Mathesar
I think the fun in this board is that it can be...

I think the fun in this board is that it can be build as a DIY project. You don't need a programmer or other specialized tools; A soldering iron, solder, flux, a tweezer and some form of...
Forum: Hardware mods 31 July 2021, 18:49
Replies: 5
Views: 796
Posted By Mathesar
True, more compatible and easier to use.

True, more compatible and easier to use.
Forum: Hardware mods 28 July 2021, 21:44
Replies: 196
Views: 35,595
Posted By Mathesar
I must add that my 500 is an early rev.5 with a...

I must add that my 500 is an early rev.5 with a 8362R8. As the ramixx500 is an A500+ one would equip it with an 8373 hires Denise right? So I started digging and found one in my stash of components....
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