Changes

X-MEM is a 512KB RAM and 512KB ROM Expansion made by [[TotO]] from [[ACME]]. Realeased on March 2014.It can be paired with a [[Y-MEM]] to expand the CPC to 1MB RAM and 1MB ROM. == Technical == ROMs are selected using the normal ROM selection I/O port (DFxx). * If 'ROM read' is active then CPC will see 16 KB pages from the X-MEMflash at ROM slots 0-6 and 8-31. If boot from CPC, then ROM 0 will be from CPC. * If 'free' is active, the CPC will also see 16 KB pages from the X-MEM flash at &40-&4f. All are visible regardless of booting from CPC or X-MEM. ROM select &47 contains the alternate lower ROM. * When boot from CPC is active, OS and BASIC are from CPC and not from X-MEM but they can still be accessed at &40-&4f if free is set. * If you wish to program the flash make sure 'free' is set and use the rom slots in the &40-&4f range. * The flash is mapped contiguously to roms &40-&4f so that when programming the flash you need to translate the flash address from the datasheet to an appropriate rom slot and address in the range &c000-&ffff. e.g. for flash address &05555 use DF41 and address &D555. For &2aaa this is DF40 and address &EAAA. * If 'free' is set then writes to &c000-&ffff go to both to the flash and to ram. When the upper rom is paged in, writes to &c000-&ffff go to the ram as normal. * Writing to the flash doesn't require the upper rom to be paged in. * If 'rom read' is not set, roms are not visible at all and flash can't be accessed. 

0. Then you will be able to choose the CPC target model for programming the X-MEM. Notethat Note that ROM 1 willbeusedinthefuturetoextendthe will be used in the future to extend the Firmware 3.14. Currently, a 448K RAM Drive“C”is Drive “C” is installed. Use |C from BASIC or C: from CP/M.

There are different ways to flash a ROM:* Using Firmware 3.15: You can program the ROM from BASIC into the X-MEM: CALL &B8DD,<source>,<rom_id>