help! Flash ROM 40015 CPC 664

[willow3411]

Help ! Hello everyone
I have a T48 programmer and use the XGpro 12.55 program.
I have a cpc 664 and I would like to flash the 40015 ROM (amdos if I'm not mistaken).
i am using winbond 27c257-10 eeproms
I would like to know the flash procedure because I can't manage it.
I think I took the correct file ( OS_644.rom ) from the wiki, but I feel like my ROM is not recognized on the CPC.
my dandanator can't find it.
if you can help me that would be great.
Thanks for reading me.
willow3411

[TotO]

Well, I will take a look into my parts. May be I have the real ROM circuit for your 664.

[willow3411]

Well, I will take a look into my parts. May be I have the real ROM circuit for your 664.

THANKS
but the file present on the wiki is not good?

willow3411

[TotO]

I don't know at all.

[eto]

OS_644 is the firmware, not AMSDOS. You have to download the AMSDOS ROM from the Wiki page.

Also your EPROM can store 32KB and AMSDOS is only 16KB, so to avoid any surprise, burn it twice to the lower and higher part of the EPROM.

[willow3411]

OS_644 is the firmware, not AMSDOS. You have to download the AMSDOS ROM from the Wiki page.

Also your EPROM can store 32KB and AMSDOS is only 16KB, so to avoid any surprise, burn it twice to the lower and higher part of the EPROM.

OK
Thanks, I'm starting to understand.
how can i flash a rom on my 27c257?
and amsdos it's the 0.5 ?
and should it be mounted with the resistors and the switch like the Bryce tutorial?
thanks

[Bryce]

I don't know the XGPro software, but most flash software has a verify command. Does the chip verify properly after programming?
And have you filled the entire IC with two images or just one? If you only programmed half of the chip, the CPC is stilll looking at the empty half.

Bryce.

[willow3411]

I don't know the XGPro software, but most flash software has a verify command. Does the chip verify properly after programming?
And have you filled the entire IC with two images or just one? If you only programmed half of the chip, the CPC is stilll looking at the empty half.

Bryce.

Hi !
I understand.
Yes, I only programmed one image, so half.
The software checks well. She is okay.
question how and which rom files to take to take and flash with two files?
thanks in advance
willow3411

[eto]

Take Amsdos 0.5 and copy it twice on the Eprom

If you are using Windows, open the command prompt in the folder, where you have the unzipped ROM file. 

Type

copy /b AMSDOS_0.5.ROM + AMSDOS_0.5.ROM Amsdostwice.rom

This will give you a 32K ROM file "Amsdostwice.rom", which you can burn with XGPro software to the Eprom.

[willow3411]

Take Amsdos 0.5 and copy it twice on the Eprom

If you are using Windows, open the command prompt in the folder, where you have the unzipped ROM file.

Type

copy /b AMSDOS_0.5.ROM + AMSDOS_0.5.ROM Amsdostwice.rom

This will give you a 32K ROM file "Amsdostwice.rom", which you can burn with XGPro software to the Eprom.

hello !
Nice ! it's ok for me
thanks

Now that I understand how it works, it's better.
next step the keyboard cable (but that I know how to do).
the CPC does something weird to me from time to time: the reader makes a sound like saucepans  .
the stepper motor is acting up. (but the games run fine)
I will check the welds at the level of the disc controller and the tablecloth.
What do you think ?

[eto]

the stepper motor is acting up. (but the games run fine)
I will check the welds at the level of the disc controller and the tablecloth.
What do you think ?

I'm not really sure what you mean (and probably can't help anyway - the disk drive is not my sweet spot).

It might be worth to make a short video (incl. sound) and put that into a new topic, so others can easily find it and try to help.

[willow3411]

Yes No problem.
I'll do some research on my side first and then I'll post a message.

[Alphaone]

Since my question is very similar. So does the firmware doesn't need to be loaded? Just the rom?

Also if you are burning the lower rom which file needs to be burned first. The basic rom or the operating system?

[Rabs]

Since my question is very similar. So does the firmware doesn't need to be loaded? Just the rom?

Also if you are burning the lower rom which file needs to be burned first. The basic rom or the operating system?

This is the command I used to create a 40022 ROM replacement for my 664

copy OS_664.ROM/b+BASIC_664.ROM/b ROM_664.ROM/b

The ROMs were taken from CPC Wiki ROM List.

I used an AM27256DC EPROM.

[SerErris]

Since my question is very similar. So does the firmware doesn't need to be loaded? Just the rom?

Also if you are burning the lower rom which file needs to be burned first. The basic rom or the operating system?

There are two ROMs in the 665.

The Firmware/Basic ROM (32k)
And the AMSDOS ROM (16k).

This particular ROM is just the AMSDOS and it is independent on the Firmware/Basic.