Problems burning Kickstart

[Toni Wilen]

Originally Posted by Damion

Awesome, I think I'll pick up a VP380 and end the headache.

Note that lower spec'd versions are also fine for 16-bit eproms. (VP-380 simply fit to my budget + possibly more future proof)

[amigamaniac]

Hi all,

I now have new EPROMS in stock at the moment, not refurbished as per my last post. They are also good for A4000, and A3000 (with ROM tower for those M.B. revisions that need it). http://www.amigamaniac.com. They are only AUD$11 each now too. The Aussie dollar is very low at the moment compared to the Pound, Euro and US dollar. Don't hesitate to ask me any questions. I've now successfully burned EPROMS for A500, 600, 1200, 2000, 3000, 4000.

The correct ROM part for A3000's that need a ROM tower (older ones?) is 27C220, or a larger one that is pin compatible with this part will also do. I might get some of these, as I imagine ROM towers (for those A3000 users that need them) are impossible to find. I was thinking to clone the ROM tower PCB. However, what would be the demand for such a project? About five I would imagine! Cheaper and easier to get the correct ROM part methinks.

In regards to erasing UV erasable EPROMS, 20 minutes seems too long to me. You should always erase them in the shortest time possible to do the job. I have found that as little as 5 minutes (sometimes sooner) has done the job in my eraser. UV erasable EPROMS have a finite number of erase cycles before they become buggered. They apparently also slow down a little each time you erase them. So since the UV light causes them to degrade slightly each time you erase them, you should do it as little as possible, and for the shortest possible time to do the job.

Obviously, always perform the blank test before you bother to program any EPROM

Nathan

Remind them ( who complain ) to look at the contents of there hard drives, and disk collection.
Lets face it ,, even in the Amiga's hay day we all wore eye patches and had a parrot on our shoulder ! Arrrrr... Them was the days meharty's.

Hi,

Sorry to bother you with an A600HD question..

I decided to try an upgrade on my A600HD with Kickstart 2.05 rev 37.350.
Got my self a 27C4100, i took the 3.1 500-600-1200 rom file that is working under WinUAE.

I then did a 16bit (2 bytes) swap on the file and burned it..

But all I get is a Black TV Screen..

If I do the same procedure with one of the 2.05 Kickstart for example 37.300 then there is no problem.

It looks like on certain A500 you have to do a mobo modification..
Could it be the same for an A600?

Or does this 3.1 kickstart only work on none HD versions of the A600?

Thanks for any help...

Kind regards,
Jorevf

[alexh]

You sure you did not use an encrypted ROM?

What speed grade is your 27C4100?

Have you tried not doing a 16-bit swap?

A600 requires no motherboard modifications. KS3.1 v40.63 works on all revisions of A600 motherboard.

Originally Posted by alexh

You sure you did not use an encrypted ROM?

What speed grade is your 27C4100?

Have you tried not doing a 16-bit swap?

A600 requires no motherboard modifications. KS3.1 v40.63 works on all revisions of A600 motherboard.

The speed is 120.
It does work with the kickstart version 2.05 37.300 from the same ROMs source, if I do the bit swap first.

With the 3.1 kickstart I get the same problem bit swap or not.
As far as I can see, the ROM sile is not encrypted.

I do see the Commodore Amiga information in the beginning of the ROM file as clear text before I do the bit swap.
Same when I read the original ROM, and do a bit swap.

Thanks for taking your time to help me!

Kind regards,
Jorevf

[Toni Wilen]

CRC32 of the non-working image? (or some other hash)

Originally Posted by Toni Wilen

CRC32 of the non-working image? (or some other hash)

The CRC32 of the 3.1 40.63 ROM file is: A425DC67

And it does work with WinUAE 1.5.3 if that makes any difference..
The eprom seems to be okay, as I can use the 2.05 version of Kickstart with them.

Kind regards,
Jorevf

[alexh]

That's not the same CRC32 as mine = FC24AE0D

http://kickstartrevival.dynalias.com/kickstart.html

Originally Posted by alexh

That's not the same CRC32 as mine = FC24AE0D

http://kickstartrevival.dynalias.com/kickstart.html

Hmm...

I wonder if I did the crc32 with a bit swapped file or not..
Will try both ways when I'm back home tonight..

[Toni Wilen]

Originally Posted by jorevf

The CRC32 of the 3.1 40.63 ROM file is: A425DC67

Your rom image is 40.68 beta/developer ROM (CRC32 is from byteswapped file, real CRC32 is 88136CA9)

ROM is 0x00200000 relocated, won't work when burned to EPROM. WinUAE autodetects this.

[quote=Toni Wilen;512021]Your rom image is 40.68 beta/developer ROM (CRC32 is from byteswapped file, real CRC32 is 88136CA9)

I have now verified the ROMS that I have..

The crc32 checksum of A425DC67 is the checksum when the file has been 16 bit 2bytes swapped.. (Text information inside the ROM is readable).

And crc32 checksum of 88136CA9 is the checksum when the file has not been swapped.. (Text looks garbage)

If I read my original 2.05 37.350 ROM in my programmer, it looks like garbage, but as soon as I do the bit 2bytes swap the text is readable..

Okay, here's the trick...
The ROM with CRC32 88136CA9 does work nice in WinUAE, not not in my A600...
But, the ROM with CRC32 FC24AE0D work as a charm in my A600, but you still have to do the 16bit 2 bytes swap before programming the eprom..

Thanks for all the help...


Best regards,
Jorevf

[Damion]

Finally figured out why the Willem didn't program.

It was Sivava's POS 16-bit adapter. I bought a different version from Kee Electronics, and after cleaning up the bridged contacts on the back side of the 42-pin socket (sloppy soldering), it programs. Burned my custom image with the BB2 updates and some awesomeness from the BlizKick archive, and it works.

Now, if I can figure out how to get PFS3 in ROM (resident not found error in Remus) life will be golden.

[papa_november]

I'm trying to burn an A1000 Kickstart 1.3 ROM set, and all I'm getting is a black screen and occasionally a purple or scrambled screen. I'm pretty sure I've split the ROM properly, and I've been trying every jumper combination with no success. Is there something I'm missing?

These are the default jumper settings (for the Kickstart loader boot ROM):

W1 = 1-2
W2 = 2-3
W3 = 2-3
W4 = 1-2
W5 = 1-2

And these are supposedly the settings for Kickstart in EPROM:

W1 = 1-2
W2 = 1-2
W3 = 2-3
W4 = 2-3
W5 = 1-2

Has anyone done this before?

[Anemos]

one noob question..
the chip 27c800,27c160 ect, can be erase for rewrite with the programmer?

[alexh]

Nope, AFAIK they are all UV erase as opposed to Electronic erase.

[kipper2k]

I was checking on Ebay and i seen these chips for sale...
http://cgi.ebay.ca/2pcs-Marcronix-MX...QQcmdZViewItem

Marcronix MX27C4100 27C4100 27C4100DC Eproms.

Someone was mentioning these in an earlier thread. My questions are,

- are these compatible in an Amiga 1200,
- Does the images need to be byte swapped,
- will all kickstarts work ,
- and i assume that 1 is required in each socket.

Thanks

[alexh]

Originally Posted by kipper2k

- are these compatible in an Amiga 1200

Yes. Check the speed though. Try to get 120 ns or faster.

Originally Posted by kipper2k

- Does the images need to be byte swapped,

Dunno about swapped, but definitely split into two 16-bit images. Most EPROM tools will do this for you.

Originally Posted by kipper2k

- will all kickstarts work

No. As a rule of thumb they have to be A1200 versions

Originally Posted by kipper2k

and i assume that 1 is required in each socket

You assume correctly.

[kipper2k]

Thanks Alex

[Calgor]

Originally Posted by alexh

Nope, AFAIK they are all UV erase as opposed to Electronic erase.

I have a different model (not 27cXXX) which is equivalent to one of 27C800 or 27C160 which is supposed to be electrically erasable. But I read up on its specs and it can only be erased a very small number of times (maybe 10-20 from memory). So those UV erasable ones are probably cheaper with more rewrites so therefore better for most.