Coder's cable: Difference between revisions
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* '''higher baudrates''': | * '''higher baudrates''': | ||
** try first with the '''dreamcast-specific baudrates''' (223214, 260416, 312500, 390625, '''520833, 781250, 1562500''') | ** try first with the '''dreamcast-specific baudrates''' (223214, 260416, 312500, 390625, '''520833, 781250, 1562500''') | ||
** '''230400''': use the -e speedhack option | ** '''230400''': use the -e speedhack option if you absolutely need 230400, otherwise use 223214 or 260416 | ||
** '''500000 and 1500000''': you can try, but that will not work on all pc (the mismatch with the baudrate of the Dreamcast is sometimes too big (4%)) | ** '''500000 and 1500000''': you can try, but that will not work on all pc (the mismatch with the baudrate of the Dreamcast is sometimes too big (4%)) | ||
Revision as of 14:44, 3 July 2023
The coder's cable is the name given to the serial-based cable some developers use to test and debug code during development. Originally, cables were connected to host devices via serial, but modern cable designs incorporate a USB controller instead. Coder's cables can also be used for other purpose's besides development, such as transferring VMU data back to a PC or dumping GD-ROMs (although quite slowly).
Not all common baudrates work, so the recommendations are:
- up until 115200, you can use the common baudrates: 9600, 19200, 38400, 57600, 115200
- if 115200 does not work, you can add the "-e" speedhack option
- higher baudrates:
- try first with the dreamcast-specific baudrates (223214, 260416, 312500, 390625, 520833, 781250, 1562500)
- 230400: use the -e speedhack option if you absolutely need 230400, otherwise use 223214 or 260416
- 500000 and 1500000: you can try, but that will not work on all pc (the mismatch with the baudrate of the Dreamcast is sometimes too big (4%))
Recommended USB-Serial chips:
- FDTI's FT232R-like chips:
- good until 781250, does not support 1562500.
- 500000 and 1500000 will not work with all chips/on all pc.
- Silicon Labs CP2102N:
- under review, should support 1562500.
How to build/buy a cable:
- Buy: eg retroonyx cable, FTDI-based cable.
- Build:
- DC serial connector: cfr DC SD Adapter V2
- select a usb-to-serial chip/cable, cfr recommended chips above
- connect TXD <-> RXD, RXD <-> TXD, RTS <-> CTS, CTS <-> RTS
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