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Nmos sim

fredrequin·nmos_sim·Alice/plane_dma.kicad_sch

This repository ships a schematic but no board layout.
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About the Nmos sim PCB

Nmos sim is an open source PCB design by fredrequin, published on GitHub under the BSD-2-Clause license. It is a board, with 392 components from 20 distinct parts.

By type, the board carries 243 transistors and 30 resistors.

It belongs with the retro computing designs in this gallery.

From the project

Simulate old NMOS logic using Kicad and Verilator

NMOS_SIM - Simulation of old NMOS chip using KiCad and Verilator ================================================================

NMOS_SIM is an attempt to run gate-level simulation of old NMOS chips by using KiCad 6.0 and Verilator

- The main focus is on Commodore/Amiga NMOS chips - Uses KiCad 6.0 as a schematics capture tool - Uses a special KiCad library that contains all the NMOS primitives - Uses a custom "k2v" tool (KiCad to Verilog) to convert the KiCad netlist into a Verilog file - Uses Verilator to run the gate-level simulation - Uses the verilator_helpers repository

Nmos sim bill of materials (BOM)

392 components, 20 distinct parts.

QtyPartRefs
243
NOT_OC
Q647, Q648, Q649, Q650, Q651, Q652, Q653, Q654 +235
29
AND2
AND_89, AND_90, AND_92, AND_93, AND_94, AND_95, AND_96, AND_97 +21
1
AND4
AND_91
1
AND3
AND_109
2
SR2
BPE_SR1, HWE_SR1
5
SR
BPRUN_SR1, BPSTOP_SR1, BPSTOP_SR2, HCE_SR1, VW_SR1
4
TR
BP_TR1, BP_TR2, BP_TR3, BP_TR4
37
CMPD
DFC_CMP2, DFC_CMP3, DFC_CMP4, DFC_CMP5, DFC_CMP6, DFC_CMP7, DFC_CMP8, DFS_CMP2 +29
1
DFFN
HWI_FF1
4
MUX
LAST_MUX1, LAST_MUX2, MUX21, MUX22
1
NAND3
NAND_6
2
NAND2
NAND_7, NAND_8
1
NOR3
NOR_28
2
NOR2
NOR_32, NOR_33
6
NOT
NOT_30, NOT_31, NOT_32, NOT_33, NOT_34, NOT_35
4
OR6
OR_29, OR_37, OR_38, OR_39
8
OR2
OR_30, OR_31, OR_33, OR_34, OR_35, OR_41, OR_42, OR_43
2
OR3
OR_36, OR_40
9
DFF
UVP_FF1, UVP_FF2, UVP_FF3, UVP_FF4, UVP_FF5, UVP_FF6, UVP_FF7, UVP_FF8 +1
30
PULLUP
R78, R79, R80, R81, R82, R83, R85, R86 +22

Nmos sim design files

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

Nmos sim: common questions

How many components are on the Nmos sim?

392 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Nmos sim design files?

From the fredrequin/nmos_sim repository on GitHub, which has the schematic and a netlist; the links under Design files point to each one.

Can I use the Nmos sim design in my own project?

Yes, under the terms of its BSD-2-Clause license, which fredrequin chose for the repository.

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