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EVA1 production

roberto314·EVA-1_Reproduction·schematics/EVA1_production/EVA1_production.kicad_pcb

EVA1 production PCB layout, top view — open source board by roberto314

About the EVA1 production PCB

EVA1 production is an open source PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 218 × 125 mm, with 104 components from 50 distinct parts.

Other key parts include the HY6264AxP, 74LS573, 27C32, 74LS74 and 74LS245. By type, the board carries 44 ICs, 27 capacitors, 16 resistors, 9 connectors, 2 transistors and 2 crystals.

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.

EVA1 production, from the project README
From the project README

Main components on the EVA1 production

HY6264AxP74LS57327C3274LS7474LS24574LS15727C6474LS16674LS3274LS221MC6803MC684574LS0874LS8674LS29074LS13974LS0474LS24474LS107MAX232416474LS14GAL16V8

EVA1 production bill of materials (BOM)

104 components, 50 distinct parts.

QtyPartRefs
1
HY6264AxP
U1
2
74LS573
U2, U14
1
27C32
U3
3
74LS74
U4, U23, U24
2
74LS245
U5, U36
3
74LS157
U6, U7, U8
2
27C64
U9, U17
2
74LS166
U10, U35
5
74LS32
U12, U31, U42, U43, U44
1
74LS221
U13
1
MC6803
U15
1
MC6845
U16
2
74LS08
U18, U37
1
74LS86
U19
1
74LS290
U20
1
74LS139
U21
1
74LS04
U22
4
74LS244
U25, U26, U27, U28
1
74LS107
U29
1
MAX232
U30
Show 30 more
QtyPartRefs
6
4164
U32, U33, U34, U39, U40, U41
1
74LS14
U38
1
GAL16V8
U45
2
BC337
Q2, Q3
1
19M66
Y2
1
19M66
Y3
1
17
J1
1
BAS
J2
1
Power
J3
1
HX20
J4
1
TF20
J5
1
9
J6
1
8
J7
1
Barrel_Jack_Switch
J8
1
MDA
J9
2
TestPoint
TP1, TP2
2
1N4148
D1, D2
16
100n
C1, C3, C6, C8, C10, C11, C12, C13 +8
6
?
C2, C4, C5, C9, C14, C30
1
47p
C7
3
10u/16
C16, C17, C18
1
47u/35
C23
2
?
R1, R2
1
560E
R3
2
82E
R4, R8
4
2k2
R5, R6, R10, R14
3
220E
R7, R11, R16
1
47E
R9
2
1k
R12, R15
1
4k7
R21

EVA1 production 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 production: common questions

How big is the EVA1 production PCB?

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

How many components are on the EVA1 production?

104 components, from 50 distinct parts. The full bill of materials is listed on this page.

Where can I download the EVA1 production 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 production 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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