Folks, you might know I am struggling with the W65C02SXB from WDC.

Yesterday I yet again tried all manner of connections with it, using WDC's tools, even trying to go back to the earlier TIDE program (as opposed to newer WDC Tools) and trying Windows XP (because the WDC tools are so old, I was wondering if they work better with older Windows versions).

For XP, the FTDI drivers won't install, and I had to go to the FTDI website to see if they had any XP drivers. They did, without support, but even installing those didn't work, because the WDC TIDE software didn't.

ANYWAYS now I am just going to forget trying to connect to the SXB board via a computer. The only connection I can do now is with the Java monitor but it's very limited.

So I will just directly program and flash the EPROM.

The ROM is a SST39SF010A (128K x CMOS Multi-Purpose Flash.

https://www.microchip.com/en-us/product/SST39SF010A

Since the SXB board uses it in 4 banks (which I am at this time still struggling to access viewtopic.php?f=12&t=7175) I want to overwrite the bank that is activated at RESET.

However I am not sure how I do that.

If I write and assemble a program, can I tell my EPROM programmer to only overwrite a specific portion of the Flash ROM? Instead of the entire thing?

I have read and saved the Flash ROM's original data, so I suppose I can restore it entirely if all else fails.

I am using the TL866 II Plus programmer, and I can use either its official "XgproV" Windows software, or the Linux/Mac open source program called minipro. I checked the MAN pages for minipro and there didn't seem to be anything about partial writes. So I don't know if this concept is even possible or we have to write EPROMs entirely.

Also, are there any specific directives or macros or commands I need to write in the Assembly listing?

Thanks!

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Thanks Garth.

Do all such file formats indicate address per line?

Or is there a raw format of just one huge contiguous hex dump? I am wondering if the one I read from the ROM is such a file.

By the way, is it possible for me to tell the assembler to start at addresses BEYOND the 16-bit maximum of the 65xx family? Or do some assemblers do this and others don't? Or do they all not do it?

e.g., .ORG $18000

which is what the ROM seems to want to have, as the mapped $8000 in my case of the SXB board.

And if not, then how can I do it, to achieve the same result on the final object binary to load into the ROM?

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

It's just for creating a binary file for writing to the Flash ROM here on the SXB, which is banked.

viewtopic.php?f=12&t=7168

(I am Googling around to find out how to pad binary files with $FF and there are numerous methods, none of which seem appropriate in this case. Many use the Linux dd command to pad extra $00 to a file so it reaches a certain size).