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Memory

Bread80·Datapoint2200·Memory/Memory.kicad_pcb

Memory PCB layout, top view — open source board by Bread80
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About the Memory PCB

Memory is an open source PCB design by Bread80, published on GitHub. It is a 2-layer board measuring 133.4 × 201.3 mm, with 165 components from 77 distinct parts.

Other key parts include the 74HCT245. By type, the board carries 51 diodes, 48 resistors, 17 capacitors, 6 transistors, 3 ICs and 2 connectors.

It belongs with the retro computing designs in this gallery.

From the project

Datapoint 2200 Schematics and Documents

This is my project to transcribe the schematics for a Datapoint 2200 serial processor machine, reverse engineer them, and recreate the original hardware with added blinkenlights.

The repository contains schematics, PCB layout files, documents and software relevant to the 2200.

The schematics are in Kicad 5 format (at least until I make my peace with the UI in newer versions). To open them you may need to import the symbol library in Datapoint2200.lib and the Datapoint2200.pretty folder.

Memory, from the project README
From the project README

Main components on the Memory

74HCT245

Memory bill of materials (BOM)

165 components, 77 distinct parts.

QtyPartRefs
3
74HCT245
U904, U905, U906
2
2N3725
Q1, Q6
2
2N2219
Q2, Q5
2
2N3726
Q3, Q4
1
Edge_Bottom
J1
1
Edge_Top
J2
2
7405
Z1, Z19
32
1405
Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9 +24
2
7442
Z10, Z28
1
TL720
Z37
1
7403
Z38
1
COL0
D901
1
COL1
D902
1
COL2
D903
1
COL3
D904
1
PHI1
D905
1
PHI2
D906
1
INPUT
D907
1
WRITE
D908
1
READ
D909
Show 57 more
QtyPartRefs
1
OUTPUT
D910
1
PAGE_SEL
D911
1
ROW0
D912
1
ROW1
D913
1
ROW2
D914
1
ROW3
D915
1
ROW4
D916
1
ROW5
D917
1
ROW6
D918
1
ROW7
D919
1
Z5
D920
1
Z4
D921
1
Z3
D922
1
Z2
D923
1
Z9
D924
1
Z8
D925
1
Z7
D926
1
Z6
D927
1
Z14
D928
1
Z13
D929
1
Z12
D930
1
Z11
D931
1
Z18
D932
1
Z17
D933
1
Z16
D934
1
Z15
D935
1
Z23
D936
1
Z22
D937
1
Z21
D938
1
Z20
D939
1
Z27
D940
1
Z26
D941
1
Z25
D942
1
Z24
D943
1
Z32
D944
1
Z31
D945
1
Z30
D946
1
Z29
D947
1
Z36
D948
1
Z35
D949
1
Z34
D950
1
Z33
D951
2
.001u 200V
C1, C2
1
.1u 10V
C3
9
.1u 100V
C6, C39, C41, C42, C43, C45, C46, C47 +1
3
22u 15V
C36, C37, C49
1
.033u 25V
C38
1
68u 15V
C44
2
220
R1, R13
2
100
R2, R14
2
680
R3, R15
13
2k2
R4, R5, R6, R7, R8, R9, R10, R11 +5
1
330
R16
1
470
R22
2
1k
R25, R28
2
6R8
R26, R27
23
470R
R901, R902, R903, R904, R905, R906, R907, R908 +15

Memory design files

The KiCad project lives in the Bread80/Datapoint2200 repository on GitHub; these links point at the commit this page was built from.

Memory: common questions

How big is the Memory PCB?

The Memory measures 133.4 × 201.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Memory?

165 components, from 77 distinct parts. The full bill of materials is listed on this page.

Where can I download the Memory design files?

From the Bread80/Datapoint2200 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Memory design in my own project?

The repository has no license, so all rights stay with Bread80. Use it as a reference, and ask the author before reusing the design.

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