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Search: Posts Made By: mkstr
Forum: News 25 February 2021, 22:33
Replies: 246
Views: 51,314
Posted By mkstr
I forgot about halt triggering the menu, but the...

I forgot about halt triggering the menu, but the memtest did pass before that happened indicating that the SRAM is being programmed properly. It kind of looks like a timing issue with this particular...
Forum: News 15 February 2021, 23:11
Replies: 246
Views: 51,314
Posted By mkstr
Instructions for hooking up the serial cable...

Instructions for hooking up the serial cable further up. (http://eab.abime.net/showpost.php?p=1456490&postcount=204)

If you do the "halt" command, which will hold the machine in reset, then run...
Forum: News 13 February 2021, 12:52
Replies: 246
Views: 51,314
Posted By mkstr
You mention it seems to work fine until you put...

You mention it seems to work fine until you put the IDE board in. This makes me think it's a bus loading issue, which could point to this expansion bus noise problem someone mentioned.

Have you...
Forum: Hardware mods 12 February 2021, 13:26
Replies: 500
Views: 83,293
Posted By mkstr
The problem is that there is no fastmem in the Z2...

The problem is that there is no fastmem in the Z2 area - it's in the Z3 area which, as you say, the A590 can't see.

I guess the fastmem could be split so 8MB goes in the Z2 space and the rest is...
Forum: Hardware mods 10 February 2021, 22:09
Replies: 500
Views: 83,293
Posted By mkstr
Also the fastmem uses the Z3 address space which...

Also the fastmem uses the Z3 address space which would be inaccessible from the outside due to the 24-bit address bus on 68000 and EC020 systems. Might be a feature worth considering on a future KEL...
Forum: Hardware mods 10 February 2021, 22:00
Replies: 500
Views: 83,293
Posted By mkstr
Actually it doesn't support external DMA for the...

Actually it doesn't support external DMA for the same reason Buffee doesn't. As an FPGA solution I could theoretically support it, but it complicates the level shifter circuit because the entire bus...
Forum: Hardware mods 10 February 2021, 20:09
Replies: 500
Views: 83,293
Posted By mkstr
Oh, and the idea of doing a standalone Gayle+SD...

Oh, and the idea of doing a standalone Gayle+SD had crossed my mind already. This part would fit in a small MAX10 or maybe even something smaller.
Forum: Hardware mods 10 February 2021, 20:07
Replies: 500
Views: 83,293
Posted By mkstr
Not abandoned, but I have been too busy to think...

Not abandoned, but I have been too busy to think about it with lockdowns and home-schooling. I am also watching PiStorm (and Buffee) closely in case it renders this obsolete. I've felt for a while...
Forum: News 27 January 2021, 01:23
Replies: 246
Views: 51,314
Posted By mkstr
Actually it could still be a problem with the...

Actually it could still be a problem with the menu software not working properly on the 030 - loading a ROM from the serial console will rule that out. Yes, connecting the RESET up elsewhere is one...
Forum: News 26 January 2021, 14:22
Replies: 246
Views: 51,314
Posted By mkstr
The "halt" command will hold the motherboard...

The "halt" command will hold the motherboard reset continuously, so this might enable you to use your simple oscilloscope to check if the 2620 reset is also being held.
Forum: News 25 January 2021, 18:34
Replies: 246
Views: 51,314
Posted By mkstr
There are three pads on the Romulator that you...

There are three pads on the Romulator that you can hook the serial cable up to with Dupont wires or whatever. The pads are marked TX and RX, and the one in the middle is ground. The serial cable...
Forum: News 25 January 2021, 13:52
Replies: 246
Views: 51,314
Posted By mkstr
I think it would be worth seeing if you can load...

I think it would be worth seeing if you can load a ROM successfully from the serial console (bypass the menu). I can do a video to show how to wire this up, but it's unlikely to be particularly soon...
Forum: Amiga scene 19 January 2021, 16:54
Replies: 190
Views: 28,547
Posted By mkstr
And you can get the SD driver package from my...

And you can get the SD driver package from my website here: https://www.mike-stirling.com/all-downloads/

(where it says "Amiga Drivers for ENC28J60 ethernet and SD card via K1208 board")

Mike
Forum: Hardware mods 17 December 2020, 20:24
Replies: 500
Views: 83,293
Posted By mkstr
So, as I think I mentioned, the A500 board has...

So, as I think I mentioned, the A500 board has ended up being 8 layer. The layout is finished and I just need to press the button on a manufacturing run, but I have been maxed out on day-job work so...
Forum: Hardware mods 23 November 2020, 09:30
Replies: 500
Views: 83,293
Posted By mkstr
Don't see any reason why it wouldn't work. The...

Don't see any reason why it wouldn't work. The accelerator doesn't alter the memory map except where it's providing emulation (so Gayle, if enabled, and the fastmem at the moment).
Forum: News 15 November 2020, 23:52
Replies: 246
Views: 51,314
Posted By mkstr
Something else that would be useful is if someone...

Something else that would be useful is if someone with an accelerator could wire up to the console port on the Romulator (TTL USB to serial adapter required, and a couple of wires soldered on). From...
Forum: News 15 November 2020, 23:25
Replies: 246
Views: 51,314
Posted By mkstr
This is correct - the Romulator holds the CPU in...

This is correct - the Romulator holds the CPU in reset to ensure that the bus is released so it can program the SRAM. The menu and the selected Kickstart ROM are no different in this respect (the...
Forum: Hardware mods 05 November 2020, 22:51
Replies: 500
Views: 83,293
Posted By mkstr
All the pins are connected to the FPGA, including...

All the pins are connected to the FPGA, including the bus grant ones. I think the key differences between the Amiga and the Atari are that the latter uses the bus grant and also non-autovectored...
Forum: Hardware mods 05 November 2020, 19:40
Replies: 500
Views: 83,293
Posted By mkstr
kipper2k has done an adapter that will work in...

kipper2k has done an adapter that will work in the A600.

I was assuming most people would just use the SD card for storage. Even SATA is going obsolete now so PCIe would seem like the better...
Forum: Hardware mods 05 November 2020, 17:13
Replies: 500
Views: 83,293
Posted By mkstr
The level shifters are just 5V tolerant buffers -...

The level shifters are just 5V tolerant buffers - they output 3.3V LVTTL anyway (which is compatible with 5V TTL logic levels), so it _should_ just work. Even powering it from 3.3V will probably...
Forum: Hardware mods 05 November 2020, 17:02
Replies: 500
Views: 83,293
Posted By mkstr
Haven't really thought about it yet, although...

Haven't really thought about it yet, although there are option links on the board that could be used to turn it off and on. Any proprietary DMA-capable interface I came up with would not have to be...
Forum: Hardware mods 05 November 2020, 10:33
Replies: 500
Views: 83,293
Posted By mkstr
Just picking up on some of the questions above: ...

Just picking up on some of the questions above:

- SDIO IDE performance will not improve much as Gayle emulation because the bottleneck is the motherboard bus (not that I can remember where we were...
Forum: Hardware mods 03 November 2020, 20:02
Replies: 500
Views: 83,293
Posted By mkstr
I've had it pushing close to 20000 SysInfo...

I've had it pushing close to 20000 SysInfo Dhyrstones on the prototype, although I would probably dial it back a bit from there for production to ensure stability. The production could be less, could...
Forum: Hardware mods 03 November 2020, 17:25
Replies: 500
Views: 83,293
Posted By mkstr
Hi All, Sorry for few updates on the...

Hi All,

Sorry for few updates on the accelerator lately - I've been busy with other things, but the placement and layout of the production design has been progressing and here is a render:
...
Forum: support.Hardware 09 October 2020, 21:37
Replies: 226
Views: 10,787
Posted By mkstr
Not "way low", but yes the latest build does just...

Not "way low", but yes the latest build does just beat the A4000 by a shave. The TG68 core is unmodified (the speed-ups are in making sure it's kept busy).

For sure TG68 does not run fast in a...
Forum: Hardware mods 28 July 2020, 14:50
Replies: 500
Views: 83,293
Posted By mkstr
@alexh: I will give some details on the cache...

@alexh: I will give some details on the cache architecture once released. I'm actually trying some different approaches at the moment to see if I can get any more performance out, particularly in...
Forum: Hardware mods 14 July 2020, 20:04
Replies: 500
Views: 83,293
Posted By mkstr
Working on the A500/1000/2000 version PCB layout...

Working on the A500/1000/2000 version PCB layout at the moment - it's a dense board so a bit slow going, but progressing. This version should also work with kipper2k's A600 adapter. A1200 version...
Forum: Hardware mods 07 July 2020, 12:44
Replies: 500
Views: 83,293
Posted By mkstr
I have no updated numbers for the SD card at the...

I have no updated numbers for the SD card at the moment (that part isn't ported to the new FPGA yet). The interface is indeed 4-bit and there is a block-based dedicated cache, but it's definitely...
Forum: Hardware mods 06 July 2020, 16:12
Replies: 500
Views: 83,293
Posted By mkstr
tg68

tg68
Forum: Hardware mods 06 July 2020, 11:43
Replies: 500
Views: 83,293
Posted By mkstr
Update time. Sorry for silence on this -...

Update time. Sorry for silence on this - everything went out of the window in March as you can imagine and my day job took over a bit. However, development has been progressing and the production...
Forum: support.Hardware 15 June 2020, 09:46
Replies: 24
Views: 1,161
Posted By mkstr
Gayle generates /RST in response to KB_RESET (at...

Gayle generates /RST in response to KB_RESET (at Q511). We specified the Q511 point because it is safe to implement a wire-OR there, easily accessible, and it mirrors the A500 connection. There is...
Forum: support.Hardware 14 June 2020, 20:46
Replies: 24
Views: 1,161
Posted By mkstr
The 600 is a bit awkward because there is no...

The 600 is a bit awkward because there is no convenient place to pick up the reset signal. I would suggest you ensure the reset is definitely working properly before fitting the Romulator.

Leave...
Forum: Hardware mods 16 March 2020, 22:31
Replies: 500
Views: 83,293
Posted By mkstr
Yes, not least because that would allow for a far...

Yes, not least because that would allow for a far more efficient interface into the SD controller including DMA, but it's a job for later.
Forum: Hardware mods 16 March 2020, 21:41
Replies: 500
Views: 83,293
Posted By mkstr
Yes, as it currently stands any motherboard Gayle...

Yes, as it currently stands any motherboard Gayle would be masked entirely, but I don't think it would be a huge problem to merge the two. It would potentially hit performance a tiny bit as it would...
Forum: Hardware mods 14 March 2020, 00:43
Replies: 500
Views: 83,293
Posted By mkstr
Update:...

Update: https://www.mike-stirling.com/2020/03/amiga-a500-accelerator-boots-from-sd-card/

You can see from the URL what the key addition is. Still a bit of work to do to maximise potential but...
Forum: Hardware mods 04 March 2020, 10:08
Replies: 500
Views: 83,293
Posted By mkstr
Actually I think it was sub 10000 at this point -...

Actually I think it was sub 10000 at this point - it was done ages ago. The improvements from subsequent performance gains are not so immediately obvious on Frontier so I haven't bother re-shooting...
Forum: Hardware mods 01 March 2020, 18:55
Replies: 500
Views: 83,293
Posted By mkstr
My intention is to make the FPGA pinout available...

My intention is to make the FPGA pinout available along with HDL source code for the basic glue to get TG68 up and running on the board. This will be more or less equivalent to the existing open...
Forum: Hardware mods 27 February 2020, 15:20
Replies: 500
Views: 83,293
Posted By mkstr
Progress report time... I have implemented a...

Progress report time... I have implemented a proper hardware SD controller module (4-bit SDIO not SPI mode). Currently mapped into memory so I can test it with this little AMOS tool I lashed up:
...
Forum: Hardware mods 20 February 2020, 09:52
Replies: 500
Views: 83,293
Posted By mkstr
Would an ASIC on an ancient node actually end up...

Would an ASIC on an ancient node actually end up being faster than an FPGA on a modern, smaller one? I haven't done an ASIC so that isn't a rhetorical question.

I actually think that if there's...
Forum: News 19 February 2020, 15:26
Replies: 246
Views: 51,314
Posted By mkstr
This is a useful data point. The firmware...

This is a useful data point.

The firmware was developed on an unaccelerated A500+, for that is the only 68000 machine I have, and although it has been tested on a range of other 16-bit machines...
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