New Minimig cores available

[Norway]

can it be used as a hd? :-)

[yaqube]

@Darrin

It is what you think it is. :-D  It should fit into Loriano's enclosure without any problem. I don't know if an additional hole for the USB socket will be necessary as firmware upgrades can be done from the SD card.

@Norway

When the firmware is finished this adapter will function as a hard disk emulator and will support up to 4 floppy drives. Maybe some additional disk image formats to the ADF type will also be supported.

[boing4000]

@Jakub

I asked Dennis some time ago about clocking the 68000 at 28MHz, he told me it could work if the 68k-bridge module is adapted to it.
But 14MHz was definitely working in Dennis 2nd released firmware. You can find out in Minimig1.v by searching for "turbo cpu".
Dennis made it like that (out of memory):

Code: [Select]


reg cpuclk;
alwasy @(posedge vgaclk)
 cpuclk<=~cpuclk

Since vgaclk is taken out of the module I made my own version like this:

Code: [Select]


reg genclk;
always @(negedge clk28m)
 genclk=~genclk;
assign cpuclk=genclk;

It is also working 100% in Minimig without loaded ar3.rom. SysinfoV3.24 is showing factor 1.77 to A600 and factor 1.34 to B2000 :-D

I am really looking forward to your "Turbo CPU Menu", sounds very interesting!! :-)

[Darrin]

@ Yaqube:

Excellent.  It looks great.  Removing chips and jamming whole boards in their place makes the Minimig look even more like a real Amiga!  :-D

Can you clarify the purpose of the USB port before someone posts a rumour that you've developed a USB2.0 card for the Minimig for use with Workbench 1.3 and running off a single floppy image!  ;-)  I assume it's just for upgrading the firmware, or can it be used to treat a memory stick like the SD card?

[Darrin]

Poster: boing4000  Posted: 2008/9/8 11:50:57

I asked Dennis some time ago about clocking the 68000 at 28MHz, he told me it could work if the 68k-bridge module is adapted to it.
But 14MHz was definitely working in Dennis 2nd released firmware. You can find out in Minimig1.v by searching for "turbo cpu".
Dennis made it like that (out of memory)

Does that mean we could have a core where we could set one of the custom jumpers to select either a 7MHz or 14MHz 68000?  Handy for Wing Commander which limps along at the moment.

[boing4000]

@Darrin

I think the USB port is only to update or reprogram the ARM Chip. But USB in Minimig would also be a very nice feature... if possible at all.

The last older core from me (also NTSC version) had 7/14MHz and Slowmem selectable via jumper on Spare-i/o. Most of this is now in Jakub's new core (selectable ram). I made only 14mhz available to my one now in current version.

[TheDaddy]

@Yacube and Darrin,

It depends on how tall (thick) the board is, from that image I don't think it's very high.

I would have to have another hole drilled for the USB, but this maybe possible in the second revision of the enclosure, I would need that board by the way for dimensions :-)

[yaqube]

Initially the USB port will be used for firmware upgrades. Maybe later it will be used for accessing the SD card from a PC (will act as a flash card reader - solution similar to the PSP's one).

This is only USB full speed (1.1) device port so you can only connect it to a PC.

More info will be available when it is done.

[TheDaddy]

@yaq

Email me when ready, so I can change the CAD for the enclosure (and send me the board, or one of them). :-)

[Darrin]

Poster: boing4000  Posted: 2008/9/8 12:19:29

@Darrin

The last older core from me (also NTSC version) had 7/14MHz and Slowmem selectable via jumper on Spare-i/o. Most of this is now in Jakub's new core (selectable ram). I made only 14mhz available to my one now in current version.

That great.  Where have you been posting your cores, or are these just pre-release projects?

[Darrin]

Poster: yaqube  Posted: 2008/9/8 12:46:09

Initially the USB port will be used for firmware upgrades. Maybe later it will be used for accessing the SD card from a PC (will act as a flash card reader - solution similar to the PSP's one).

This is only USB full speed (1.1) device port so you can only connect it to a PC.

Thanks for the info.  Good luck with the project.

More info will be available when it is done.

Why does that phrase always send a shiver down my spine!   :lol:

[boing4000]

@Darrin

It was a normal release and posted somewhere in this forum ;-) But that was all out of the old core version and is no longer working together with current PIC firmware.

I can post the new 14MHz version, if Jakub can tell me where the default settings for PAL and NTSC is located?
Right now I only have PAL by default with 14MHz.

[Darrin]

@Boing4000

I must have missed that.

I'll keep an eye out for any other releases you make.  A switchable "turbo" mode would be very welcome for games like "X-COM:  UFO Enemy Unknown"

[Darrin]

Poster: TheDaddy  Posted: 2008/9/8 13:06:08

@yaq

Email me when ready, so I can change the CAD for the enclosure (and send me the board, or one of them).

Perhaps you could trade him an enclosure for a board.   :lol:

[yaqube]

@Sascha

In Minimig1.v file at line 168 there is an NTSC parameter definition. Change it to "1" and your builts will default to the NTSC screen mode.

Also read comments in BootRom.v file and change FPGA version id to identify your releases.

[boing4000]

Thanks Jakub, now I can build seperate PAL and NTSC core with 7/14MHz selectable via Jumper.
When you release the OSD version, my one will be obsolete and I am looking forward to that time :-)