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#1
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
#2
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 .
#3
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.
#4
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by McArti0 - Today at 19:51 #5
Quote from: arnoldemu on 21:11, 06 January 16correct.Realy?
But I think nobody uses cmos.
#6
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by willow3411 - Today at 19:44Quote from: McArti0 on Today at 19:08https://www.cpcwiki.eu/index.php/DIY:Floppy_DrivesThank you, I saw this page but I don't understand the wiring.....
is it wire to wire?
The goal is not to disassemble my DDI-1 but just to change the cable.
I saw on a forum that it was necessary to cut tracks on the tablecloth...
willow3411
#7
Isn't this a reasonably well known issue with CMOS Z80s ( I think I've seen speculation that, since the instruction was unintended, it's just a result of how internal signals value when floating differs between NMOS/CMOS)
There's also a slight difference in LD A,R/LD A,I behaviour according to @arnoldemu
https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/z80-cpu-nmos-or-cmos/
There's also a slight difference in LD A,R/LD A,I behaviour according to @arnoldemu
https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/z80-cpu-nmos-or-cmos/
#8
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by McArti0 - Today at 19:08 #9
OUT (c),0 working 
but like OUT (c),255 
OUT &BC00,15: OUT &BD00,15: rem CURSOR REGISTER
?INP(&BFFF)
15
CALL &BFFC, &e9dd ,&c9 , &71ED, &BD00, &100
REM JP(IX) RET OUT(c),0 LD BC,&BD00
? INP(&BFFF)
255
Dear Zilog, does 1 CY really save you?
But SymbOS working
but like OUT (c),255 OUT &BC00,15: OUT &BD00,15: rem CURSOR REGISTER
?INP(&BFFF)
15
CALL &BFFC, &e9dd ,&c9 , &71ED, &BD00, &100
REM JP(IX) RET OUT(c),0 LD BC,&BD00
? INP(&BFFF)
255
Dear Zilog, does 1 CY really save you?
But SymbOS working
#10
Technical support - Hardware related / Re: cable DDI-1 for CPC 6128
Last post by robcfg - Today at 18:47Isn't the DDI-1 wired to supply 5v on the floppy cable?
Could that damage the CPC?
Could that damage the CPC?