HardLabs

Finalgrom99

endlos99·finalgrom99·pcb/fg99.kicad_pcb

Finalgrom99 PCB layout, top view — open source AVR/Arduino board by endlos99

About the Finalgrom99 PCB

Finalgrom99 is an open source AVR/Arduino PCB design by endlos99, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100.2 × 63.1 mm, with 29 components from 14 distinct parts.

Its main chip is the ATMEGA328P-TQFP32, from the AVR/Arduino family. Other key parts include the XC95144XL-TQ100, CY62158E-TSOP44 and NCP1117. By type, the board carries 14 capacitors, 4 ICs, 4 resistors, 2 modules, 2 connectors and 2 switches.

From the project

A cartridge for the TI 99/4A that runs ROM and GROM images from an SD card

The TI 99/4A FinalGROM Cartridge, or FinalGROM 99 for short, is a cartridge for the TI 99/4A home computer that allows you to run ROM and GROM cartridge images from an SD card. It succeeds the [FlashROM 99][3] released in 2016.

The FinalGROM 99 supports ROM images, GROM images, and mixed images of up to 1 MB in size that use the write-to-ROM bank switching scheme. The cartridge does not require the Peripheral Expansion Box and runs on both PAL and NTSC consoles, including modified consoles with an F18A. It will also run on v2.2 consoles and enables those to run ROM-only programs.

Finalgrom99, from the project README
From the project README

Main components on the Finalgrom99

XC95144XL-TQ100CY62158E-TSOP44ATMEGA328P-TQFP32NCP1117

Finalgrom99 bill of materials (BOM)

29 components, 14 distinct parts.

QtyPartRefs
1
XC95144XL-TQ100
U1
1
CY62158E-TSOP44
U2
1
ATMEGA328P-TQFP32
U3
1
NCP1117
U4
1
SD_Module
M1
1
SD_Slot
M2
1
CONN_02X18
P1
1
CONN_02X03
P3
2
SW_PUSH
SW1, SW2
1
LED
D1
2
10µ
C1, C2
12
100
C3, C4, C5, C6, C7, C8, C9, C10 +4
2
330
R1, R3
2
10k
R2, R4

Finalgrom99 design files

The KiCad project lives in the endlos99/finalgrom99 repository on GitHub; these links point at the commit this page was built from.

Finalgrom99: common questions

What microcontroller does the Finalgrom99 use?

The Finalgrom99 is built around the ATMEGA328P-TQFP32, from the AVR/Arduino family.

How big is the Finalgrom99 PCB?

The Finalgrom99 measures 100.2 × 63.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Finalgrom99?

29 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Finalgrom99 design files?

From the endlos99/finalgrom99 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Finalgrom99 design in my own project?

Yes, under the terms of its GPL-3.0 license, which endlos99 chose for the repository.

Can I test firmware for the Finalgrom99 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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