HardLabs

EVA86-2

roberto314·EVA-1_Reproduction·schematics/EVA86-2/EVA86-2.kicad_pcb

EVA86-2 PCB layout, top view — open source board by roberto314

About the EVA86-2 PCB

EVA86-2 is an open source PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 251 × 157.7 mm, with 86 components from 38 distinct parts.

Other key parts include the MC6803, 74LS373, 74LS139, 27C64 and 74LS257. By type, the board carries 33 ICs, 25 resistors, 23 capacitors, 4 transistors and 1 crystal.

It belongs with the displays & leds designs in this gallery.

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.

EVA86-2, from the project README
From the project README

Main components on the EVA86-2

MC680374LS37374LS13927C6474LS257MC684574LS8674LS0074LS24574LS165UM6264DM74LS7474LS3227C3274HC0474LS29374LS10774LS08

EVA86-2 bill of materials (BOM)

86 components, 38 distinct parts.

QtyPartRefs
1
MC6803
U1
1
74LS373
U2
1
74LS139
U3
1
27C64
U4
5
74LS257
U5, U7, U8, U9, U10
1
MC6845
U6
2
74LS86
U11, U31
3
74LS00
U12, U25, U30
2
74LS245
U13, U20
2
74LS165
U14, U21
3
UM6264DM
U15, U16, U19
2
74LS74
U17, U24
2
74LS32
U18, U33
1
27C32
U22
1
74HC04
U23
2
74LS293
U26, U27
2
74LS107
U28, U29
1
74LS08
U32
4
BC337
Q1, Q2, Q3, Q4
1
19M66
Y1
Show 18 more
QtyPartRefs
1
47u/25
C3
11
100n
C4, C5, C8, C13, C14, C15, C16, C18 +3
1
22p
C6
1
47p
C7
1
47u
C9
1
220p
C10
7
22n
C23, C24, C25, C26, C28, C29, C30
2
2k2
R1, R14
8
1k
R2, R4, R6, R7, R8, R9, R17, R21
3
10k
R3, R12, R23
1
4k7
R5
1
100E
R10
3
220E
R11, R18, R22
2
100k
R13, R24
2
1k2
R15, R25
1
390E
R16
1
82E
R19
1
10E
R20

EVA86-2 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.

EVA86-2: common questions

How big is the EVA86-2 PCB?

The EVA86-2 measures 251 × 157.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EVA86-2?

86 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the EVA86-2 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 EVA86-2 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.

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