vk3heg

Hi Guys/Girl's...

I've purchased a programmer (http://cgi.ebay.com.au/ws/eBayISAPI....=STRK:MEWNX:IT with the number eight adapter)

When I look at the contecnts of a kickstar rom dump, the AMIGA ROM Operating System and Libraries in the first few lines are readly readable/visable.

Yet when doing a rom read of my Amiga 3000 3.1 rom and then looking at the output from the programmer I get junk such as this:

AGMOepitS etnaiLra


Is reading the Amiga's rom in the programmer posable or not?

I don't have any 27c400 chips yet to try writing a rom image to (They are on the way though)...

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Loedown

I too recently got one of these Willem programmers.

I have a very old graphics board ( PC ) that has two eproms in it and when I do a checksum of them, it's close but not identical as what's printed on the top.

In regard to your issues with KS and reading, I can cite two possibilities that may be correct.

1. Commodore actually encrypted the data in the ROM

2. In some models of Amiga you need to adapt the pins to go to various other points or be disconnected, for example KS2.04 in some models of A500

Toni Wilen

ROM data is correct.

A3000 (and all 32-bit Amigas) have 2 16-bit ROM chips. Data is interleaved. (2 bytes from ROM0, 2 bytes from ROM1, 2 bytes from ROM0, etc..)

(Why does everyone still buy Willems when there have been cheap, much faster and better ones available for years?)

Loedown

What would you recommend Toni?

Toni Wilen

I think any cheap chinese USB programmer with at least 42 pin socket (no need for any 16-bit adapters) is better than normal Willem.

Wellon, EasyPro etc.. Just check capabilities and supported chip list. (I have Wellon VP380. I also had Willem but I quickly become annoyed because it was unreliable with very big EPROMs and slow. Less than 1 min vs 15mins..)

OP: I have command line ROM split/merge utility somewhere.

Zetr0

@vk3heg

not only is the data interleaved, as Toni points out, but when compared to the WinTel/MacTel PC its also byte swaped (little endian) if I am not mistaken =)

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vk3heg

I got this programmer as it was cheap. It might only get used for this project.

From reading the "burning a kickstart' thread I got the impression that the kickstart was burnt to both chips as is, after being byte swaped. (Perhaps this impression is wrong?)

prowler

@Zetr0,
From the information in vk3heg's opening post, it appears that you are indeed correct!

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Zetr0

@prowler

LOL, as much as I would like to say its because I am an uber genius.... its actualy because I found out the hard-way after my first 12 chip marathon batch programming fiasco of 2007 shortly after I got my willem proggy LOL

Indeed... little endian.... its a bugger....

thing is though what really anoys me is that I KNOW this from when I use to program various micro-controllers... *(i was so angry with myself!!!)*

anyway.... if you are copying a ROM from an existing Amiga one, you wont need to perform a BYTE swap when burning it back.

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gulliver

I just ckecked a bit. I know why everyone sticks to a Willem programmer, instead of the ones you recomend. It is simply about cost: a willem with the 42 pin adapter is about 50 dollars while the ones you recommend are way above 100 dollars.
It is a pitty, I would really enjoy burning my own kickstart, [Dream mode ON]or at least reflash it in an Amiga comercial solution that supports non zorro Amigas. But I cant reliably use one or the other.

vk3heg

We all must bow to Zet!

Your not the only one... Recently got a new batch of PSU's for pc's... Was pulling out hair, trying to get it to power up a machine. Turned out this psu has extra cpu 12v lines, and I had the wrong one in the socket and also around the wrong way...