The TF536 on a CDTV (Project Abandoned)
Moderators: terriblefire, Terriblefire Moderator
- 8 Bit Dreams
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Re: The TF536 on a CDTV
Nope...TF534 & TF520 producing green screen on my cdtv...
Retro computer hardware & repair in Germany
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Re: The TF536 on a CDTV
534 Works here with the latest firmware
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Re: The TF536 on a CDTV
Found this in cdtv.device
EDIT: its the only call to allocmem in cdtv.device
Code: Select all
ROM:000003E0 ; =============== S U B R O U T I N E =======================================
ROM:000003E0
ROM:000003E0
ROM:000003E0 sub_3E0: ; CODE XREF: ROM:00000146↑p
ROM:000003E0 ; ROM:000001A0↑p ...
ROM:000003E0 moveq #0,d1
ROM:000003E2 move.l a6,-(sp)
ROM:000003E4 movea.l (unk_4).w,a6
ROM:000003E8 jsr -$C6(a6)
ROM:000003EC movea.l (sp)+,a6
ROM:000003EE tst.l d0
ROM:000003F0 rts
ROM:000003F0 ; End of function sub_3E0
ROM:000003F0
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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- Moderator Team
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Re: The TF536 on a CDTV
Ok found the rom location of that code...
So i guess i need to patch this location with $7201
Code: Select all
ROM:00F0407C word_F0407C: dc.w $7200
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
- 8 Bit Dreams
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Re: The TF536 on a CDTV
Will this subroutine be called each time CD is thrown in? Can You redirect it on the fly? We can also patch cdtv.device in extended rom in worst case...
Retro computer hardware & repair in Germany
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Re: The TF536 on a CDTV
I guess we can find out by testing a CDTV in WinUAE with that as a breakpoint.8 Bit Dreams wrote: ↑Sun Jun 16, 2019 10:36 pm Will this subroutine be called each time CD is thrown in?
Patching a single ROM location is easy but i have a suspicion that this rom is mirrored in a few places. we'll need to check its not executed at 0xE0xxxx or $A8xxxxCan You redirect it on the fly? We can also patch cdtv.device in extended rom in worst case...
EDIT: Tested in winuae. definitely does get called multiple times during boot.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
- 8 Bit Dreams
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- Posts: 785
- Joined: Fri Nov 09, 2018 7:12 am
- Location: Germany
Re: The TF536 on a CDTV
Fair enough, that's why im thinking about patching cdtv.device, so we don't get bugs under different circumstances..
Retro computer hardware & repair in Germany
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Re: The TF536 on a CDTV
Generally would prefer no patching in firmware. But if it’s a single byte then I could do a man in the middle stunt and only patch if the rom read as $2700. That would be safe on all machines and you could decode all the mirrors.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
Re: The TF536 on a CDTV
I have made a lots of testing with burned CDs with CDTV. I have tested at least 4 different CD burners and burned CDs only works IF you burn them max 5x speed. Burning CDs with 32x wount work. There is no sensible explanation for this, I know.
Re: The TF536 on a CDTV
This is what Toni Wilen (winUAE dev) said about a CDTV
CDTV + accelerator can have multiple problems:
- CDTV CD drive is DMA capable and can't access any RAM outside of first 16M address space (24-bit Z2 limit)
- CDTV CD autoconfig board must be located at $e90000 (=must be first 64k Z2 IO device in autoconfig chain. It is autoconfig but ROM driver uses hardcoded addresses..). Accelerator may have its own 64k IO board which will conflict with CD device. Simple workaround is to make sure accelerator Z2 IO (If it even has one) is at least 128k in size.
- Even if accelerator has only "24-bit" RAM (max 8M), it most likely don't have any external DMA support.