Shared Projects by Revaldinho

Amstrad CPC ROM Card.

Two ROM sockets can each take either a 16KByte EPROM or a 32KByte E(E)PROM. Using 32KByte parts gives a capacity equivalent to 4 original ROMS.

The DIP switches on the RHS of the board determine which ROM sockets are enabled and how they are mapped into the ROM space. The left most socket can also be used to replace the lower ROM (Firmware) - for example in a CPC464 using a 32KByte device in the left most socket can be used to replace the existing firmware with that from a CPC6128.

Status

Boards built and fully tested. No problems.

More Information - see https://github.com/revaldinho/cpc_ram_expansion/tree/master/cpc_fourrom

Amstrad CPC 512K RAM Expansion using a XC9572 5V CPLD for all logic.

Status

• First board received, assembled and CPLD programmed in-situ (via JTAG).
• Memory passing basic tests with an unexpanded CPC464, timing seems fine.
• DK'Tronics software detects board and reports all 512K in memory test on startup

This version fixes the connector pin-out to be compatible with MX4 Motherboards and standard ribbon cable arrangements.

For project and CPLD programming details see my GitHub repository

Amstrad CPC 512K RAM Expansion using a XC9572 5V CPLD for all logic.

Status

• First board received, assembled and CPLD programmed in-situ (via JTAG).
• Fully working with DK'Tronics Bank management and Silicon Disk software

Bugs

• Box connector needs to be mounted on underside of V1.00 board rather than on top side. This will be fixed with a V1.01 revision before moving onto the 74 Series version.

For project and CPLD programming details see my GitHub repository