1,546 bytes added,
23:03, 16 March 2010 Basically, the official [[Amstrad Disk Drive|DDI-1]] and any other third-party disc interfaces for the CPC 464 should work on the CPC 464 as well. However, there are two problems:
== Expansion Port ==
The CPC464 used a 50pin edge-connector, the CPC464+ uses a 50pin centronics-style connector. The pin-outs are identical, so this problem can be solved with a simple adapter. Equivalent adapters do also exist for the german CPC6128 (which has a 50pin centronics-style expansion port, too).
== System Cartridge Bug ==
There is a bug in the system cartridge, that causes the BIOS to execute code at C072h in ROM bank 07h. Normally, the AMSDOS bank in the system cartridge contains the Burnin' Rubber bootmenu at that location. However, this works only if the CPC+'s built-in AMSDOS is mapped to bank 07h.
When using an external disk-interface with external AMSDOS ROM (or other DOS clone), executing code at C072h is typically crashing the computer. The same problem occurs when activating the CP/M autoboot feature via [[LK Links]] (which swaps bank 0 and 7). Possible workarounds are:
* Replace opcode LD C,07h (at 05EBh in system cart) by LD C,83h (this fixes the bug)
* Replace opcode LD HL,C072h (at 05E8h in system cart) by LD HL,0000h (completely disables the bootmenu, which was a rather idea annoying anyways)
* Or, remove or disable the ROM in the disc-interface, and cut the ROMDIS signal in the disc-interface (so the built-in AMSODS in the CPC+ is used; this can be done without EPROM burner, but doesn't support 80-track drives)