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#1
#2
After the instruction BIT n,(HL) execution, bits 3 and 5 of the flag register become containing values that are not documented in the official documentation at all.
Actually these bits are copied from the bits 11 and 13 of the internal register pair of Z80 CPU, which is used for 16-bit operations, and in most cases to handle addresses.
Actually these bits are copied from the bits 11 and 13 of the internal register pair of Z80 CPU, which is used for 16-bit operations, and in most cases to handle addresses.
#3
Sorry, after a quick look it seems like the CBM Colecovision is missing. That shall not be.
#4
Applications (CPC and CPC-related) / Re: HDCPM - boot and run CP/M ...
Last post by GUNHED - Today at 22:18Very nice! 
#5
Well, time to get some spares for the future cpc next then. Especially the 20 MHz versions. 
#6
Quote from: andycadley on Today at 19:17There's also a slight difference in LD A,R/LD A,I behaviour according to @arnoldemu
Quote from: McArti0 on Today at 18:56But SymbOS working
Thanks, yery good to know!
SymbOS is using LD A,I/LD I,A a lot, so this part seems to be 100% the same for both Z80 versions.
#7
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by willow3411 - Today at 20:22Quote from: eto on Today at 20:17Just to avoid confusion: The DDI-1 is the floppy controller for the 464 with AMSDOS, the disk drive alone is the FD-1.Hi Eto
Generally speaking all you need is a 1:1 connection from edge connector to IDC floppy connector. An old PC floppy cable that has both connector types for 3.5" and 5.25" would perfectly fit (as long as no pins are flipped).
The FD-1 injects 5V into some of the wires, that are not required on the 34p cable. The DDI-1 is using that power for its electronics. On the CPC - at least according to the schematics, these pins are not connected. So (in theory) it should be save to simply connect the FD1 with a normal cable to the CPC.
HOWEVER:
1) I have never tried myself and verified it.
2) Also it's easy to attach the cable upside down as neither the FD-1 connector nor the edge connector on the CPC prevent that - or you can just mix up directions when crimping the cable. Cutting the tracks won't help if you connect the cable upside down. Not sure if the 5V injected by the drive can harm the computer but To be honest I would prefer not to try it out and just disconnect the 5V injection inside the FD1.
ah great explanations
I understood everything !
Thanks a lot
tomorrow I make the Edge tablecloth ---> IDC 34p 1:1
beautiful evening
and thank you all!!
I will report back to
#8
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by willow3411 - Today at 20:17Quote from: McArti0 on Today at 19:51https://www.cpcwiki.eu/index.php/DIY:Floppy_Drives#Pinning_translation_between_different_connectors_.28CPC-PL-9.2C_Centronics_36pin.2C_Floppy_connector_34pin.29Thanks a lot !
donc c'est bien un cable point à point si je comprends bien .
#9
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by eto - Today at 20:17Just to avoid confusion: The DDI-1 is the floppy controller for the 464 with AMSDOS, the disk drive alone is the FD-1.
Generally speaking all you need is a 1:1 connection from edge connector to IDC floppy connector. An old PC floppy cable that has both connector types for 3.5" and 5.25" would perfectly fit (as long as no pins are flipped).
The FD-1 injects 5V into some of the wires, that are not required on the 34p cable. The DDI-1 is using that power for its electronics. On the CPC - at least according to the schematics, these pins are not connected. So (in theory) it should be save to simply connect the FD1 with a normal cable to the CPC.
HOWEVER:
1) I have never tried myself and verified it.
2) Also it's easy to attach the cable upside down as neither the FD-1 connector nor the edge connector on the CPC prevent that - or you can just mix up directions when crimping the cable. Cutting the tracks won't help if you connect the cable upside down. Not sure if the 5V injected by the drive can harm the computer but To be honest I would prefer not to try it out and just disconnect the 5V injection inside the FD1.
Generally speaking all you need is a 1:1 connection from edge connector to IDC floppy connector. An old PC floppy cable that has both connector types for 3.5" and 5.25" would perfectly fit (as long as no pins are flipped).
The FD-1 injects 5V into some of the wires, that are not required on the 34p cable. The DDI-1 is using that power for its electronics. On the CPC - at least according to the schematics, these pins are not connected. So (in theory) it should be save to simply connect the FD1 with a normal cable to the CPC.
HOWEVER:
1) I have never tried myself and verified it.
2) Also it's easy to attach the cable upside down as neither the FD-1 connector nor the edge connector on the CPC prevent that - or you can just mix up directions when crimping the cable. Cutting the tracks won't help if you connect the cable upside down. Not sure if the 5V injected by the drive can harm the computer but To be honest I would prefer not to try it out and just disconnect the 5V injection inside the FD1.
#10
