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Registers

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

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

Registers 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 98 components from 20 distinct parts.

Other key parts include the 74HC574, 74HCT157, 74HC244, 74HC74 and 74HC86. By type, the board carries 51 ICs, 17 capacitors, 16 diodes, 9 resistors and 5 connectors.

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 Registers

74HC57474HCT15774HC24474HC7474HC8674HC0874HCT3274HC68874AHC1G04

Registers bill of materials (BOM)

98 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
10
74HC574
U1, U7, U11, U16, U17, U18, U33, U34 +2
19
74HCT157
U2, U3, U5, U6, U9, U10, U13, U20 +11
8
74HC244
U4, U8, U12, U15, U46, U47, U48, U49
3
74HC74
U14, U19, U31
2
74HC86
U27, U28
2
74HC08
U29, U30
1
74HCT32
U32
4
74HC688
U37, U38, U39, U40
1
74AHC1G04
U50
1
74HCT32
U51
1
TO_BACKPLANE
J1
1
ACCUMULATOR_OUT
J2
1
FROM_CTRL
J3
1
TO_MEMORY
J4
1
TO_FP
J5
16
LED
D1, D2, D3, D4, D5, D6, D7, D8 +8
10
100NF
100nF
C1, C3, C6, C8, C9, C10, C11, C13 +2
7
10µF
C2, C4, C5, C7, C12, C16, C17
7
1K
R1, R2, R3, R4, R5, R6, R8
2
4.7K
R7, R9

Registers design files

The KiCad project lives in the 89Mods/LVDC repository on GitHub; these links point at the commit this page was built from.

Registers: common questions

How big is the Registers PCB?

The Registers measures 209.6 × 108.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Registers?

98 components, from 20 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 Registers 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 Registers design in my own project?

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

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