NTSC MiniMig

[whiteb]

I hope you have not fried any components on the Minimig by seeing if 6V would work ?

[whiteb]

Crom00 wrote:

This unit it the same unite WhiteB just assembled and posted on YouTube.

He luckily had a compabile VGA monitor he have bought previously to use with a 50hz scan doubler on his A4000.

This is exactly the sort of thing I wanted to test before I commit thousands of $$$ to manufacture these.

A 60hz version makes so much more sense now.

yerp.  Trusty DiamondView 1770H.  Best AU$9 I ever spent, and i see there is one in Queensland for a pick up price of AU$4. (Less than a day remaining).  Ever thought of moving to Australia ??  :lol:

[whiteb]

Crom00 wrote:
Nope. I have a +5 volt, 2amp unit I purchased specifically for this.

If the unit was fried would it even power up? Would there be a burning smell?

 But I do recall you asking me if a variable Power supply that only had 4.5, 6, 9 and 12V would work ?

[color=ff0000]I got one of those siwtchable ac-dc power supplies.  with 4.5,6,9 volts dc switchable power.

There is no 5 volt setting , will the Mini-Mig work if
I set it to 6?
[/color]

It may make a burning smell, it may not.  Depends on the component.

Another thing, is that a device *MIGHT* support 50hz, but does it support 50hz at 31Khz. which is where yo need the compatability chart from the actual manual, instead of a sales person just saying.. "Yeah Yeah this unit supports 50hz" just to get a sale.

[whiteb]

Okay, another thing that comes to mind, is the MMC properly inserted ?

Did you push it in, until the socket made a sort of "Click, Click" noise.  That is the MMC locking into place.

Because several things will cause no screen to be displayed (apart from a dicky video cable) is.. No MMC, or missing files on the MMC.  Case sensitivity is not an issue with file names, as long as the relevant files are named right, minimig1.bin and kick.rom, also make sure that the file names are EXACT, we all know how windows loves to rename filenames with ~1.  In windows it may look okay, but double check in DOS (or dos prompt) for any 8.3 name irregularities.

like minimig~1.bin or something stupid. (Amiga had done it correctly from Day 1).

[whiteb]

How does he tell the minimig what ADF to load ?

He needs video to get the minimig menu up to select the ADF to mount it before it Boots.

I was thinking of asking if he has access to a 'Cro' (oscilloscope) to check the outputs.  But that is not a piece of equipment usually found in the average family garage/shed.

[whiteb]

adolescent wrote:
Although monitors might say they don't support 50Hz, they might.  My old Shuttle XP17 tft shows 31kHz/50Hz (scandoubled) output but shows a warning message.  All I have to do is cycle the power and the warning message goes away until I switch modes again.

Ahhhhhh TFT, if you check EAB and threads here, they are littered with people running Scan doublers on TFT.

It also doesnt help that the cable he has, he suspects to be faulty as it did not display a picture from his A1200.

[whiteb]

JimS wrote:

whiteb wrote:
How does he tell the minimig what ADF to load ?

I guess I had the notion that it was like a real amiga and would autoboot from df0. Oops. ;-) Might be a nice feature for later...  any adf named df0: or dh0: gets booted.
 

Yeah, would be good.  Dennis You reading this ?

[whiteb]

alexh wrote:
Dennis wont need any of that junk.

Hardware reference manual, 20 minutes of verilog changes and FPGA recompilation, an NTSC crystal (or 20MHz + DCM change) is all he needs.

From memory, Dennis already has the Hardware reference manual, he studied it when making the Core for Minimig.

From what he has told me, he is already working on a PIC update (Something to do with the floppy controller), so do not rule out adding 60hz support yet from Dennis.

[whiteb]

Crom00 wrote:
Is it possible to fab or mod a minimig with socketed crystal connector and ship the unit with 2 crystals, one for pal and once for NTSC?

The user would then have to laod the correct FPGA data at startup?

Would like to ship a board that can do both ntsc. pal versions.

Well, if it uses the internal clock of the FPGA (I think that was one of the options), then it is quite possible to have multiple versions of the core to handle NTSC/PAL/50hz/60hz all in one download place, depending on the user's requirements.

You could also supply boards catered to each person's requirements.