reZet80 PIONEER - memory map and address decoding

The 64 KiB address space of the Z80 is divided into 4 banks of 16 KiB each:
0000-3FFF, 4000-7FFF, 8000-BFFF, C000-FFFF.
Only the first 16 KiB bank is reserved for internal PIONEER use.
The remaining 48 KiB are free to use.

The first bank is divided into 8 regions of 2 KiB each:
0000-07FF, 0800-0FFF, 1000-17FF, 1800-1FFF, 2000-27FF, 2800-2FFF, 3000-37FF and 3800-3FFF.
The first 4 KiB are reserved for ROM.
The following 5 slots can host either ROM or RAM.
The last 2 KiB are provided for RAM and are further subdivided into 2 regions of 1 KiB each:
3800-3BFF and 3C00-3FFF.
Do not mix up slots with ROM and RAM and make sure that ROM is always located at the bottom and RAM at the top of the 16 KiB bank.

The 74LS138 and 74LS139 demultiplexers provide the following low-active signals:
- /MEMSEL_0000-3FFF (reserved for internal use)
- /MEMSEL_4000-7FFF
- /MEMSEL_8000-BFFF
- /MEMSEL_C000-FFFF
- /ROMCS_0000-07FF (reserved for 2 KiB ROM)
- /ROMCS_0800-0FFF (reserved for 2 KiB ROM)
- /RXMCS_1000-17FF (reserved for 2 KiB ROM or RAM)
- /RXMCS_1800-1FFF (reserved for 2 KiB ROM or RAM)
- /RXMCS_2000-27FF (reserved for 2 KiB ROM or RAM)
- /RXMCS_2800-2FFF (reserved for 2 KiB ROM or RAM)
- /RXMCS_3000-37FF (reserved for 2 KiB ROM or RAM)
- /MEMSEL_3800-3FFF (reserved for internal use
- /RAMCS_3800-3BFF (reserved for 1 KiB RAM)
- /RAMCS_3C00-3FFF (reserved for 1 KiB RAM)

All memory addresses are given in hexadecimal notation.

Bill of materials:
- 2x DIP-16 socket
- 74LS138 demultiplexer
- 74LS139 demultiplexer
- 2x capacitor 100 nF