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Memory

89Mods·LVDC·KiCad/Memory/Memory.kicad_pcb

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

Memory 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 58 components from 21 distinct parts.

Other key parts include the 74HCT32, 74HCT08, 74HCT04, 74HCT157 and 74HCT11. By type, the board carries 27 ICs, 14 capacitors, 13 resistors, 3 connectors and 1 diode.

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 Memory

74HCT3274HCT0874HCT0474HCT15774HCT1174HC68874HC3228C1674HCT0074HC0274HCT245IS61C256

Memory bill of materials (BOM)

58 components, 21 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
74HCT32
U1, U5
3
74HCT08
U2, U8, U14
1
74HCT04
U3
5
74HCT157
U4, U9, U10, U11, U12
2
74HCT11
U6, U7
1
74HC688
U13
1
74HC32
U15
2
28C16
U16, U17
1
74HCT00
U18
1
74HC02
U19
4
74HCT245
U20, U21, U22, U23
4
IS61C256
U24, U25, U26, U27
1
FROM_CTRL
J1
1
FROM_REGS
J2
1
TO_BACKPLANE
J3
1
LED
D1
4
10µF
C1, C3, C5, C7
10
100NF
100nF
C2, C4, C6, C8, C9, C10, C11, C12 +2
1
1K
R1
9
10K
R2, R3, R4, R5, R6, R7, R8, R9 +1
Show 1 more
QtyPartRefs
3
R_NETWORK08
R_Network08
RN1, RN2, RN3

Memory design files

The KiCad project lives in the 89Mods/LVDC 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 209.6 × 108.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Memory?

58 components, from 21 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 Memory 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 Memory design in my own project?

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

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