Corrupt CDTV ROM?

Steve · 28 May 2002, 12:41

What's the deal with this CDTV ROM anyway. It's never worked for me and even when I try the latest version of WinUAE I still get the same damn error message:

"Kickstart checksum incorrect. You probably have a corrupted ROM image"

Is this really a problem with my CDTV ROM or a problem with WinUAE? Has anyone else managed to get it working?

RetroMan · 28 May 2002, 12:46

What you have is the Extended CDTV Rom so it belong into the extended rom file (like the cd32 extended rom does) ! At the Kickrom you have to load in a normal Kick 1.3

But don´t bother to try that out since no CDTV CD will boot right now ..... boot your CDTV CD´s with CD³² config !

Steve · 28 May 2002, 13:09

Thanks RetroMan that's got it working... almost. Is it supposed to look this red?

Anyway as a small reward here is a webpage that talks about CDTV games that never were.

Quote:

Dungeon Master (FTL): FTL president Wayne Holder reports the developer largely completed the CDTV conversion of this seminal dungeon crawl, only to be stymied by the inability to obtain reliable info from CBM on saving games to memory cards.

Darn it!!

http://www.pwr.wroc.pl/AMIGA/AR/ar50.../feature1.html

RetroMan · 28 May 2002, 14:26

Quote:

Originally posted by Steve
Thanks RetroMan that's got it working... almost. Is it supposed to look this red?

Just a little bug

pess fire and after the CD Player Menu appeared press ESC and voila ...... correct colors

Steve · 28 May 2002, 14:40

You're right again.

That's got it. Cheers.

andreas · 28 May 2002, 22:13

Yes, but that should be properly fixed someday.
A real CDTV instantly shows all colors at this screen. Toni?

Toni Wilen · 29 May 2002, 08:04

Quote:

Yes, but that should be properly fixed someday.

CDTV ROM doesn't find CDTV's CDROM controller -> show red screen to inform the user that something is very badly wrong...

I'll "fix" this if someone sends me CDTV's DMAC specs (dma controller, same chip is used in A570 too)

jmmijo · 29 May 2002, 11:21

Id did a Google search and only came up with some acronym info and some parts lists. A few pages with info on the CDTV unit itself of course, no specs on the DMAC

Is there any way to NOP/JMP around this code or do you really need to emulate it? I'm thinking you could bypass this check altogether but hey, I'm just an old hack from way back so I'm sure you know what needs to be done

Toni Wilen · 29 May 2002, 11:28

Of course it is needed. CDTV emulation without working CDROM emulation is quite useless

jmmijo · 29 May 2002, 12:57

So really you are wanting to emulate everything on the CDTV then and that you can't write code on the PC side of things to do this as emulated Amiga side couldn't see this external driver?

I guess I was thinking that you could use the PC hardware to read an actual CDTV formatted disk in your PC CD-Reader, but I guess that would not work

Toni Wilen · 29 May 2002, 17:51

Quote:

I guess I was thinking that you could use the PC hardware to read an actual CDTV formatted disk in your PC CD-Reader, but I guess that would not work

Of course this work (CD32 emulation does this) but it isn't possible without CDTV's CDROM interface hardware emulation.

You need CDTV CDROM controller emulation because it is the only way to "listen" to CDTV's CDROM commands and then translate them to regular CDROM commands and return status codes/data back and have 100% compatibility.

Of course it is also possible to emulate cdtv.device (just like uaescsi.device or bsdsocket.library) but this is incompatible with hardware banging programs and it isn't very compatible.

I only know CDTV seems to use some kind of old SCSI-style interface or similar and DMAC is located at 0xe90000...

CD32 was "quite" easy to understand because it uses very simple and stupid CDROM controller interface. (CD32 is clearly build as cheaply as possible)

andreas · 29 May 2002, 18:25

Toni,

I think I've found something for you!

http://www.cdtv.org.uk/cdtv-technical.html

This might help.

jmmijo · 29 May 2002, 20:38

I found this page as well but couldn't find specs on the DMAC itself but perhaps Toni could get more info from this page then I can.

@Toni, it makes more sense now that you explained it to me, there does seem to be some resemblance to the SCSI controller on the A3000 as well as some of the CDTV pages seem to indicate this, but then again who knows. However you did mention the A570 controller which appears to be identical but alas I couldn't find any info on it either

Toni Wilen · 30 May 2002, 13:33

I found this page ages ago... Address space listing helped me to emulate CDTV's battery backed RAM.

I have searched with google and groups.google.com with every possible word that have something to do with CDTV without success

jmmijo · 30 May 2002, 21:38

Toni, would having an actual CDTV unit help you out or is it just needing the specs to the CD controller?

Toni Wilen · 31 May 2002, 11:06

Quote:

would having an actual CDTV unit help you out

Unfortunately it won't help much.. But of course I am interested in buying cheap CDTV and CD32 unit..

jmmijo · 31 May 2002, 11:58

I'll keep my eyes open for the specs to the CDTV dmac and SCSI controller. Hopefully it's out there

As for cheap CDTV/CD32 units, yes, I'd like to find them too, here in the states they just want too much for them

Galaxy · 22 August 2004, 11:15

I stumbled apon this: Nicolas Welte's Hardware Projects, which has a 2MB RAM expansion for the A570. The author seems to know abit about CDTV hardware - he may be worth contacting.

http://people.freenet.de/x1541/hardware/a570ram.html

mark_k · 24 August 2004, 01:45

Might having a disassembly of the CDTV extended ROM help add support for the CDTV into WinUAE? I have a fair amount of experience using ReSource...

Also, the page given in Galaxy's post above mentions that the A2091 SCSI controller also uses the same DMAC chip. I think A2091 schematics are available in the service manual, so that plus disassembling the A2091 ROM could provide further info.

-- M

Toni Wilen · 25 August 2004, 18:44

Quote:

Originally Posted by mark_k

Might having a disassembly of the CDTV extended ROM help add support for the CDTV into WinUAE? I have a fair amount of experience using ReSource...

Of course, this is partly how CD32 support was done but I don't want to do it again because it was very time consuming and boring...

Quote:

Also, the page given in Galaxy's post above mentions that the A2091 SCSI controller also uses the same DMAC chip. I think A2091 schematics are available in the service manual, so that plus disassembling the A2091 ROM could provide further info.

I already have CDTV schematics and it doesn't really help much. All magic is inside the custom chips..

DMAC programming specs would explain everything (I hope) but it seems there wasn't any public specs (except possible non-leaked CBM internal documentation?)

28 May 2002, 12:41	#1
Steve I Identify as an Ewok Join Date: Jul 2001 Location: North Lincolnshire Age: 45 Posts: 2,356	Corrupt CDTV ROM? What's the deal with this CDTV ROM anyway. It's never worked for me and even when I try the latest version of WinUAE I still get the same damn error message: "Kickstart checksum incorrect. You probably have a corrupted ROM image" Is this really a problem with my CDTV ROM or a problem with WinUAE? Has anyone else managed to get it working?

28 May 2002, 14:40	#5
Steve I Identify as an Ewok Join Date: Jul 2001 Location: North Lincolnshire Age: 45 Posts: 2,356	You're right again. That's got it. Cheers. Attached Thumbnails

24 August 2004, 01:45	#19
mark_k Registered User Join Date: Aug 2004 Location: Posts: 3,343	Might having a disassembly of the CDTV extended ROM help add support for the CDTV into WinUAE? I have a fair amount of experience using ReSource... Also, the page given in Galaxy's post above mentions that the A2091 SCSI controller also uses the same DMAC chip. I think A2091 schematics are available in the service manual, so that plus disassembling the A2091 ROM could provide further info. -- M Last edited by mark_k; 24 August 2004 at 01:55.

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28 May 2002, 12:46	#2
RetroMan Registered User Join Date: Aug 2001 Location: Germany Age: 51 Posts: 3,704	What you have is the Extended CDTV Rom so it belong into the extended rom file (like the cd32 extended rom does) ! At the Kickrom you have to load in a normal Kick 1.3 But don´t bother to try that out since no CDTV CD will boot right now ..... boot your CDTV CD´s with CD³² config !

28 May 2002, 22:13	#6
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	Yes, but that should be properly fixed someday. A real CDTV instantly shows all colors at this screen. Toni?

29 May 2002, 11:21	#8
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	Id did a Google search and only came up with some acronym info and some parts lists. A few pages with info on the CDTV unit itself of course, no specs on the DMAC Is there any way to NOP/JMP around this code or do you really need to emulate it? I'm thinking you could bypass this check altogether but hey, I'm just an old hack from way back so I'm sure you know what needs to be done

29 May 2002, 11:28	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,517	Of course it is needed. CDTV emulation without working CDROM emulation is quite useless

29 May 2002, 12:57	#10
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	So really you are wanting to emulate everything on the CDTV then and that you can't write code on the PC side of things to do this as emulated Amiga side couldn't see this external driver? I guess I was thinking that you could use the PC hardware to read an actual CDTV formatted disk in your PC CD-Reader, but I guess that would not work

29 May 2002, 18:25	#12
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	Toni, I think I've found something for you! http://www.cdtv.org.uk/cdtv-technical.html This might help.

29 May 2002, 20:38	#13
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	I found this page as well but couldn't find specs on the DMAC itself but perhaps Toni could get more info from this page then I can. @Toni, it makes more sense now that you explained it to me, there does seem to be some resemblance to the SCSI controller on the A3000 as well as some of the CDTV pages seem to indicate this, but then again who knows. However you did mention the A570 controller which appears to be identical but alas I couldn't find any info on it either

30 May 2002, 13:33	#14
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,517	I found this page ages ago... Address space listing helped me to emulate CDTV's battery backed RAM. I have searched with google and groups.google.com with every possible word that have something to do with CDTV without success

30 May 2002, 21:38	#15
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	Toni, would having an actual CDTV unit help you out or is it just needing the specs to the CD controller?

31 May 2002, 11:58	#17
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	I'll keep my eyes open for the specs to the CDTV dmac and SCSI controller. Hopefully it's out there As for cheap CDTV/CD32 units, yes, I'd like to find them too, here in the states they just want too much for them

22 August 2004, 11:15	#18
Galaxy Registered User Join Date: May 2004 Location: Canberra, Australia Age: 46 Posts: 1,417	I stumbled apon this: Nicolas Welte's Hardware Projects, which has a 2MB RAM expansion for the A570. The author seems to know abit about CDTV hardware - he may be worth contacting. http://people.freenet.de/x1541/hardware/a570ram.html

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