Author Topic: Rom slot 7 on CPC664 with C4CPC & M4 board  (Read 877 times)

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Offline ajcasado

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Rom slot 7 on CPC664 with C4CPC & M4 board
« on: 23:44, 03 November 21 »
Hi,
I'm trying to use a unidos cpr image made with the @OffseT utility:
https://unidos.cpcscene.net/lib/exe/fetch.php?media=unidos-cartridge-creator-windows_32-bit.tgz (run under linux with wine).

When I load the cpr image with @gerald 's c4cpc the rom in slot 7 (unidos main rom) doesn't init. If I load the same cpr image with @Duke 's m4 board it boots ok.
If I use slot 6 for unidos rom it boots ok with c4cpc, but the m4 rom set at slot 127 in the m4 isn't recognised and unidos starts in degraded mode.

I'm targeting to use the c4cpc for rom slots 0-29 and m4 board for rom slots 32-63. Is this arrangement possible?

I use the c4cpc in the cpc664 with @abalore 's plus2cpc.
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Online TotO

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #1 on: 23:49, 03 November 21 »
I think the DOS ROM7 (logical ROM) on Plus cartridge is located at ROM3 (physical ROM). You may try that.
« Last Edit: 23:51, 03 November 21 by TotO »
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Offline ajcasado

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #2 on: 00:08, 04 November 21 »
I guess that this logical to physical management is yet well managed by @OffseT 's utility, as the cpr image runs ok in the m4 board.
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Offline ajcasado

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #3 on: 00:22, 04 November 21 »
This is what I get using slot 3:

« Last Edit: 00:25, 04 November 21 by ajcasado »
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Online TotO

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #4 on: 09:52, 04 November 21 »
Thank you!

So, I'm curious to see the ROM listed from the Amstrad cartridge provided with the 6128plus.
« Last Edit: 09:54, 04 November 21 by TotO »
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Offline gerald

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #5 on: 18:09, 04 November 21 »
When I load the cpr image with @gerald 's c4cpc the rom in slot 7 (unidos main rom) doesn't init. If I load the same cpr image with @Duke 's m4 board it boots ok.
I use the c4cpc in the cpc664 with @abalore 's plus2cpc.
Unlike the plus range, the 664/6128 internal ROM7 cannot be disabled by an extension.
What you see is likely the result  of a bus contention between the internal ROM and external ROM (M4 or C4CPC). One solution would be to physically remove the internal ROM.
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Offline ajcasado

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #6 on: 18:17, 04 November 21 »
With the M4 Board I can replace the internal ROM7 without issues. Is the slot where I usually place M4ROM or UniDOS ROM.
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Offline gerald

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #7 on: 18:42, 04 November 21 »
With the M4 Board I can replace the internal ROM7 without issues. Is the slot where I usually place M4ROM or UniDOS ROM.
That just mean that the M4 data bus drivers are stronger than the internal ROM ones, not that you disabled it  ;)
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Offline ajcasado

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #8 on: 22:04, 04 November 21 »
That just mean that the M4 data bus drivers are stronger than the internal ROM ones, not that you disabled it 
Fortunately the AMSDOS ROM 40015 is socketed, I detached the chip but the result is the same, ROM slot 7 doesn't initialize from the cpr image.

See the attached images from the configuration utility and the rom listing.
So, I'm curious to see the ROM listed from the Amstrad cartridge provided with the 6128plus.
I cannot make my old 664 to boot with the plus original cartridge, I guess that the firmware is not compatible.


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Offline OffseT

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #9 on: 12:05, 08 November 21 »
See the attached images from the configuration utility and the rom listing.I cannot make my old 664 to boot with the plus original cartridge, I guess that the firmware is not compatible.
UniDOS Cartridge Creator was created with Amstrad Plus in mind. Generated cartridges should be installed in a C4CPC or burned in a real cartridge.

I have no idea of what M4 cartridge emulation or other similar hardware are actually achieving and how compatible they are with real Plus cartridges mappings. The issue might be there.

BTW, what you were suggesting actually works on Amstrad Plus: using an UniDOS cartridge for ROM in slot <32, and then M4 (or any other ROM board) for other ROMs >31.
« Last Edit: 12:07, 08 November 21 by OffseT »
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Offline ajcasado

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Re: Rom slot 7 on CPC664 with C4CPC & M4 board
« Reply #10 on: 22:38, 11 November 21 »
Ok, so I will use the C4CPC only for playing the gx4000 converted games collection (which is actually a cool use), thanks for the info.
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