HardLabs

EVA1 v2

roberto314·EVA-1_Reproduction·schematics/EVA1_v2/EVA1_v2.kicad_pcb

EVA1 v2 PCB layout, top view — open source RP2040/RP2350 board by roberto314

About the EVA1 v2 PCB

EVA1 v2 is an open source RP2040/RP2350 PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 218 × 125 mm, with 141 components from 70 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the HY6264AxP, 74LS573, 27C32, 74HCT74 and 74HCT245. By type, the board carries 46 capacitors, 38 ICs, 34 resistors, 12 connectors, 3 diodes and 2 transistors.

It belongs with the displays & leds designs in this gallery, and the repository also holds 1 earlier revision of it.

From the project

Recreation of the very rare K-K Systems EVA-1 Display Adapter for the Epson HX-20 Computer

Recreation of the very rare K-K Systems EVA-1 Display Adapter for the Epson HX-20 Computer

In the folder disassembly are three versions of the original firmware:

evaorig: original firmware evaenh: enhanced firmware (mostly original) evaext: extended firmware (8k Text RAM, additional functions) - see the .asm file for more comments.

The gal folder contains the equations and .jed file for the GAL.

EVA1 v2, from the project README
From the project README

Main components on the EVA1 v2

HY6264AxP74LS57327C3274HCT7474HCT24574ALS15727C6474HCT165CY62256-70PC74HCT3274LS221MC6803MC684527C25674HCT0874HCT8674LS290Sparkfun_Pro_Micro74HCT1474LS107MAX23274LVC08GAL16V8AMS1117-3.3

EVA1 v2 bill of materials (BOM)

141 components, 70 distinct parts.

QtyPartRefs
1
HY6264AxP
U1
2
74LS573
U2, U14
1
27C32
U3
3
74HCT74
U4, U23, U24
2
74HCT245
U5, U36
7
74ALS157
U6, U7, U8, U25, U26, U27, U28
1
27C64
U9
2
74HCT165
U10, U35
1
CY62256-70PC
U11
1
74HCT32
U12
1
74LS221
U13
1
MC6803
U15
1
MC6845
U16
1
27C256
U17
1
74HCT08
U18
1
74HCT86
U19
1
74LS290
U20
1
Sparkfun_Pro_Micro
U21
1
74HCT14
U22
1
74LS107
U29
Show 50 more
QtyPartRefs
1
MAX232
U30
2
74LVC08
U31, U37
2
GAL16V8
U32, U45
1
AMS1117-3.3
U33
1
RaspberryPi_Pico
U34
2
BC337
Q2, Q3
1
18M432
Y2
1
18M432
Y3
1
17
J1
1
BAS
J2
1
HX20
J4
1
TF20
J5
1
9
J6
1
8
J7
1
Barrel_Jack_Switch
J8
1
Converter
J9
1
Micro_SD_Card_Det2
J10
1
Conn_Coaxial
J11
1
Conn_01x06
J12
1
Conn_01x02
J13
1
Straight Cable
JP8
1
PX_CLK_BTN
SW1
1
AUTO_ADJUST
SW2
1
TestPoint
TP1
2
1N4148
D1, D2
1
BAT54AW
D3
16
100n
C1, C3, C4, C6, C8, C10, C11, C12 +8
18
100n
C2, C5, C101, C103, C104, C106, C108, C110 +10
1
47p
C7
1
1n
C9
1
4n7
C14
4
10u/16
C16, C17, C18, C19
1
47u/35
C23
1
47p
C107
1
1n
C109
1
4n7
C114
1
47u/35
C123
4
4k7
R1, R13, R17, R21
7
10k
R2, R24, R25, R26, R27, R28, R29
1
560E
R3
2
82E
R4, R8
4
4k7
R5, R113, R117, R121
3
2k2
R6, R10, R14
2
220E
R7, R11
1
47E
R9
2
1k
R12, R15
3
845E
R16, R19, R23
3
422E
R18, R20, R22
1
2k2
R106
1
220E
R111

EVA1 v2 design files

The KiCad project lives in the roberto314/EVA-1_Reproduction repository on GitHub; these links point at the commit this page was built from.

EVA1 v2: common questions

What microcontroller does the EVA1 v2 use?

The EVA1 v2 is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the EVA1 v2 PCB?

The EVA1 v2 measures 218 × 125 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EVA1 v2?

141 components, from 70 distinct parts. The full bill of materials is listed on this page.

Where can I download the EVA1 v2 design files?

From the roberto314/EVA-1_Reproduction repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the EVA1 v2 design in my own project?

The repository has no license, so all rights stay with roberto314. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the EVA1 v2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

More boards in EVA-1_Reproduction

Earlier revisions in the repo: EVA1

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