HardLabs

Z80RAM3

lynchaj·nhyodyne·Z80RAM3/Z80RAM3.kicad_pcb

Z80RAM3 PCB layout, top view — open source board by lynchaj
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About the Z80RAM3 PCB

Z80RAM3 is an open source PCB design by lynchaj, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 58 components from 30 distinct parts.

Other key parts include the 74F02, 74LS244, 74F32, 74LS86 and 74LS245. By type, the board carries 17 capacitors, 16 ICs, 7 relays, 6 jumpers, 4 resistors and 3 diodes.

It belongs with the retro computing and power & battery designs in this gallery.

From the project

Modular Backplane Computer

Provides Random Access Memory (RAM) for Z80 MBC

Uses two DS1210 Non-Volatile Memory Controllers with CR2032 for battery backed NVRAM

RAM Memory Page Configuration Latch for 32KB Upper and/or Lower memory pages

Boot jumper, capacity for multiple RAM boards in system, only one must be bootable

JP1 is Boot RAM Option. Pins 1-2 closed (default) for Boot enable assuming single RAM board present in system. Will cause upper 32KB RAM page to be present at power on or after reset. Only one RAM board per system can be boot enabled. Multiple RAM boards can be present but only one can be boot enabled…

Main components on the Z80RAM3

74F0274LS24474F3274LS8674LS245DS121074LS688SRAM_512Ko74LS27374F08

Z80RAM3 bill of materials (BOM)

58 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74F02
U1
3
74LS244
U2, U4, U7
3
74F32
U3, U8, U15
1
74LS86
U5
1
74LS245
U6
2
DS1210
U9, U16
1
74LS688
U10
2
SRAM_512Ko
U11, U12
1
74LS273
U13
1
74F08
U14
1
Z80 BUS BACKPLANE
P1
1
SPARES
P2
1
BATTERY
BT1
1
BOOT
JP1
1
BATT SEL
JP2
4
JUMPER
JP3, JP4, JP5, JP6
1
VCC TOL 1
K1
1
MAX RAM
K2
1
VCC TOL 0
K3
1
1 128/512
K4
Show 10 more
QtyPartRefs
1
32K/16K
K6
1
0 128/512
K7
1
UPPER SW
K9
1
10000
RR2
1
IO PORT ADDR
SW1
3
LED
D1, D2, D3
15
0.1u
C1, C2, C3, C4, C5, C6, C7, C10 +7
2
10u
C8, C9
1
4700
R1
3
470
R2, R3, R5

Z80RAM3 design files

The KiCad project lives in the lynchaj/nhyodyne repository on GitHub; these links point at the commit this page was built from.

Z80RAM3: common questions

How big is the Z80RAM3 PCB?

The Z80RAM3 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Z80RAM3?

58 components, from 30 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Z80RAM3 design files?

From the lynchaj/nhyodyne repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Z80RAM3 design in my own project?

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

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