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GPIO

89Mods·LVDC·KiCad/GPIO/GPIO.kicad_pcb

GPIO PCB layout, top view — open source board by 89Mods
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About the GPIO PCB

GPIO is an open source PCB design by 89Mods, published on GitHub under the MIT license. It is a 4-layer board measuring 209.6 × 108.5 mm, with 113 components from 36 distinct parts.

Other key parts include the EPM240T100, MCP1319MT-29LE-OT, W25Q32FVSS, AMS1117-3.3 and 74HC574. By type, the board carries 40 resistors, 35 ICs, 18 capacitors, 16 connectors, 2 diodes and 1 crystal.

From the project

Replica of the Launch Vehicle Digital Computer using 74-series logic

This LVDC is accurate to the original in the sense that it executes the same instructions that function the exact same, has the same memory layout (including special locations like HOP save and MQ) and can execute snippets of original LVDC code.

The differences are: - This computer is parallel and not bit-serial, and is also microcoded - It is implemented using 74-series logic and not discrete transistors (I wish to be able to take it with me to events, so it couldn’t get too big) - Everything hooked up to the PIO (IO read/write) instruction is my own invention, with the exception of the the…

Main components on the GPIO

EPM240T100MCP1319MT-29LE-OTW25Q32FVSSAMS1117-3.374HC57474HCT24474HCT74SN74LV1T34DCKSN74ALVC164245DGG74HC74GFMPW1-MULTIDAC7611LM358HT12D74HC3274AHC1G86HT12E

GPIO bill of materials (BOM)

113 components, 36 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
EPM240T100
U1
1
MCP1319MT-29LE-OT
U2
1
W25Q32FVSS
U3
1
AMS1117-3.3
U4
2
74HC574
U5, U30
3
74HCT244
U6, U25, U26
1
74HCT74
U7
15
SN74LV1T34DCK
U8, U9, U11, U12, U13, U14, U20, U21 +7
1
SN74ALVC164245DGG
U10
1
74HC74
U15
1
GFMPW1-MULTI
gfmpw1-multi
U16
2
DAC7611
U17, U18
1
LM358
U19
1
HT12D
U23
1
74HC32
U29
1
74AHC1G86
U31
1
HT12E
U32
1
CXO_DIP8
X1
1
JTAG
J1
1
TO_BACKPLANE
J2
Show 16 more
QtyPartRefs
4
CONN_01X01
Conn_01x01
J3, J4, J5, J10
1
AUDIO_OUT
J6
4
CONN_01X04
Conn_01x04
J7, J8, J12, J16
2
RADIO_MODULE
J9, J15
1
TO_FP
J11
2
CONN_01X08
Conn_01x08
J13, J14
1
10K
RV1
2
LED
D1, D2
1
10µF
C1
17
1µF
C2, C3, C4, C5, C6, C7, C8, C9 +9
34
10K
R1, R2, R3, R4, R5, R6, R7, R8 +26
1
330
R12
2
1K
R15, R18
1
33K
R19
1
2K
R38
1
1M
R40

GPIO design files

The KiCad project lives in the 89Mods/LVDC repository on GitHub; these links point at the commit this page was built from.

GPIO: common questions

How big is the GPIO PCB?

The GPIO measures 209.6 × 108.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the GPIO?

113 components, from 36 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 GPIO design files?

From the 89Mods/LVDC repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the GPIO design in my own project?

Yes, under the terms of its MIT license, which 89Mods chose for the repository.

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