HardLabs

Z80-MegaMapper

tergav17·Z80-MegaMapper·KiCAD/Nabu_MEGAMAPPER/Nabu_MEGAMAPPER.kicad_pcb

Z80-MegaMapper PCB layout, top view — open source board by tergav17

About the Z80-MegaMapper PCB

Z80-MegaMapper is an open source PCB design by tergav17, published on GitHub. It is a 2-layer board measuring 158.8 × 91.4 mm, with 42 components from 16 distinct parts.

Other key parts include the Z80CPU, 74LS32, 74LS670, HM6116 and 74LS157. By type, the board carries 20 capacitors, 19 ICs and 3 connectors.

It belongs with the retro computing designs in this gallery.

From the project

Z80 interposer board providing extended memory and I/O instruction mapping

The Z80 MegaMapper (ZMM) is designed to enhance the ability of existing retro computers. This is done by interposing the Z80 CPU and intercepting certain signals. The current version of the MegaMapper provides the following enhancements:

- An additional 512 KB of static RAM, expandable up to 2 MB. - Simple memory management, allowing the 4 independently selectable memory banks. Banks can also be write protected. - Virtual machine mode, supporting “transparent” traps that do not depend on a specific stack pointer location. - Fully programmable I/O space in virtual mode, allowing device…

Z80-MegaMapper, from the project README
From the project README

Main components on the Z80-MegaMapper

Z80CPU74LS3274LS670HM611674LS15774LS24474LS37474LS85XC9536PC4474LS139AS6C4008-55PCN74LS245

Z80-MegaMapper bill of materials (BOM)

42 components, 16 distinct parts.

QtyPartRefs
1
Z80CPU
U1
1
74LS32
U2
2
74LS670
U3, U4
1
HM6116
U5
3
74LS157
U6, U7, U8
1
74LS244
U9
2
74LS374
U10, U11
1
74LS85
U12
1
XC9536PC44
U13
1
74LS139
U14
4
AS6C4008-55PCN
U15, U16, U17, U18
1
74LS245
U19
2
Z80 Socket Header
J1, J2
1
JTAG
J3
19
0.1 uF
C1, C2, C3, C4, C5, C6, C7, C8 +11
1
100 uF
C20

Z80-MegaMapper design files

The KiCad project lives in the tergav17/Z80-MegaMapper repository on GitHub; these links point at the commit this page was built from.

Z80-MegaMapper: common questions

How big is the Z80-MegaMapper PCB?

The Z80-MegaMapper measures 158.8 × 91.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Z80-MegaMapper?

42 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Z80-MegaMapper design files?

From the tergav17/Z80-MegaMapper repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Z80-MegaMapper design in my own project?

The repository has no license, so all rights stay with tergav17. Use it as a reference, and ask the author before reusing the design.

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