devpic schematics

[ssq]

My apologies for sounding like a total newbie

I want to try making the DevPic programmer hardware based on the schematic on Aminet (dev/cross/devpic.lha). Where do I draw 12V from (top left)?

[JimDrew]

External 12v supply, like a wall wart.

[ssq]

right, thanks but where do I connect the negative from the external power supply?

[pandy71]

Originally Posted by ssq

right, thanks but where do I connect the negative from the external power supply?

To GND (pin 25) - excuse my curiosity but why are you trying to corrupt your Amiga?

[Hewitson]

If you have to ask these questions you REALLY shouldn't be attempting to build this device.

[ssq]

Actually I'm electronics illiterate indeed but after having successfully soldered an amiga<->scart cable and a MIDI interface (from some magazine schematics) I thought I'd try this one as well to flash the pic needed to build the PS/2 adapter...

[Xtal]

Actually I'd suggest you to use a cheap (you can get a used one for free) IBM PC compatible computer for this, using the Amiga with it's sensitive CIAs for parallel port is not a good idea. The serial port atleast has the 1488/1489 buffers to fry first

There's a lot of good OpenSource programmers available out there for PIC. And a lot of cheap IBM compatibles for free.... CIAs are in the long term, more expensive............

[Vot]

Screw opensource and doing it from your amiga, do it from your pc.

http://www.ebay.com.au/itm/USB-MiniP...-/221092473435

Programmers like this are soooo cheap and they program thousands of devices including pic's if you get the right attachments obviously it can program dip based devices that are up-to 40 pin (i think it is) with the built in zif socket. (See other versions of the tl866). Open source programmers are a waste of time.

(Im not recommending that seller btw, find one that has a good rating, is cheap and ships to you)

[ssq]

that's nice i'll try to get one of those multiprogrammers from ebay to keep it for other projects as well

[Vot]

Originally Posted by ssq

that's nice i'll try to get one of those multiprogrammers from ebay to keep it for other projects as well

[ Show youtube player ]

Review of the programmer, i got one... Its great..

[alenppc]

This is a pretty crappy programmer, I bought it cause it was the cheapest but beware of the following:

- It doesn't support 27cx00 eproms.
- It doesn't support the (only) still commercially available ATF16V8/22V10 gals.
- It will program the 16Fxxx PIC correctly, but it gives you misleading errors as seen in this thread...

[Vot]

I haven't seen that pic error myself.



Edit:
That's the support list:
http://www.autoelectric.cn/minipro/M...upportList.txt

As for the gal, never tried it but the page here
http://translate.google.com/translat...n%2Fminipro%2F

Shows a chart showing it can program gal16v8's i thought both were compatible.

As for the pic config bits:
Sounds like a software bug. A bit annoying.... you have to flash it, then flash the program bits separate without erasing the chip. Please note the config bits they tell you to unselect below is applicable to the project they were talking about. Set them as you need them.

http://www.eevblog.com/forum/microco...5-config-bits/

"using a PIC18F4685 and a MiniPro TL866CS/A ... when you load the bootloader, like any other hex file, it will try to put the values in the config bits that it DOESN'T set to FF. This, however, is wrong. Simply load the bootloader, program the chip, then UNCHECK 'erase before'. Then find Clear All Buffer in the menus (this is the important step as it will return the config bits to default values and clear all the junk that was added). Then manually check off the following config bits:

IESO - FCMEN - FOSC3 - FOSC0 - BORV1 - WDTPS2 - WDTPS1 - LPTIOSC - PBADEN - LVP - XINST

And then when you click the program button, uncheck everything but the config bits checkbox (so that's the only thing you're burning) and then program it.

Also make sure the USER ID field is all 0s. And away you go! "

[alenppc]

@Vot thanks for the clarification regarding PICs. It definitely is a sw issue, ultimately I was able to program the PIC properly but it took a bit of fiddling around.

For 16v8/22v10s it's very hit and miss. I was able to program some GAL22V10Ds from China, but it fails to program Lattice/AMD 16V8Cs, all ATFxxx variants (got them brand new from Digikey) and all PAL variants. I played around with the settings but could not get them to work.

I have to investigate how to create a config file for the 27C400 as I'd like to burn a custom 3.9 ROM.