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Pat80

penguin86·pat80·pat80-computer/hardware/schematics/pat80/pat80.kicad_pcb

Pat80 PCB layout, top view — open source board by penguin86
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About the Pat80 PCB

Pat80 is an open source PCB design by penguin86, published on GitHub. It is a 2-layer board measuring 305.4 × 204.8 mm, with 44 components from 30 distinct parts.

Other key parts include the Z80CPU, 256k (32k x 8) EEPROM, 256k (32k x 8) SRAM, 74HC32 and 74HC04. By type, the board carries 20 capacitors, 9 ICs, 5 connectors, 5 resistors, 2 switches and 1 crystal.

It belongs with the retro computing designs in this gallery.

From the project

Pat80 Home Computer is an attempt to develop the simplest possible Zilog Z80 based computer in 2021

Pat80 Home Computer is an attempt to develop the simplest possible Zilog Z80 based computer in 2021.

Here is a picture of the early stages of development:

The only fully working configuration as now is the Core board with two devices hooked to its I/O bus: the Arduino Parallel Terminal (see pat80-io-devices/parallel-terminal and pat80-computer/software/z80-assembly/os/drivers/arduinoterminal.asm) and the SN76489 sound chip (see pat80-computer/software/z80-assembly/os/drivers/hd44780.asm`)

Pat80, from the project README
From the project README

Main components on the Pat80

Z80CPU256k (32k x 8) EEPROM256k (32k x 8) SRAM74HC3274HC0474HC13874HC24474HC245LM7805_TO220

Pat80 bill of materials (BOM)

44 components, 30 distinct parts.

QtyPartRefs
1
Z80CPU
U1
1
256k (32k x 8) EEPROM
U2
1
256k (32k x 8) SRAM
U3
1
74HC32
U10
1
74HC04
U11
1
74HC138
U20
1
74HC244
U21
1
74HC245
U22
1
LM7805_TO220
U30
1
4Mhz
Y1
1
panel_btn_brk
J1
1
Power input
J2
1
panel_led_halt
J3
1
panel_btn_rst
J4
1
nmi
J5
1
IO_bus_conn
IOBUS1
1
SW_Push
SW1
1
Break
SW2
1
LED
D1
2
10uF
C1, C6
Show 10 more
QtyPartRefs
2
30pF
C2, C3
1
0,22uF
C4
1
0,1uF
C5
2
470uF
C7, C20
6
100nF
C8, C11, C13, C14, C16, C18
6
56pF
C9, C10, C12, C15, C17, C19
1
3,3M
R1
2
10k
R2, R3
1
470
R4
1
270k
R5

Pat80 design files

The KiCad project lives in the penguin86/pat80 repository on GitHub; these links point at the commit this page was built from.

Pat80: common questions

How big is the Pat80 PCB?

The Pat80 measures 305.4 × 204.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pat80?

44 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pat80 design files?

From the penguin86/pat80 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Pat80 design in my own project?

The repository has no license, so all rights stay with penguin86. Use it as a reference, and ask the author before reusing the design.

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