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TMSRGBCustom Hat v1 for JFF

herraa1·JFF-TMSHAT·hardware/kicad/JFF-TMSHAT-Hat-TMSRGBCustom-Build1/JFF-TMSHAT-Hat-TMSRGBCustom.kicad_pcb

TMSRGBCustom Hat v1 for JFF layout, top view — open source board by herraa1

About the TMSRGBCustom Hat v1 for JFF

TMSRGBCustom Hat v1 for JFF is an open source PCB design by herraa1, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 56 × 58 mm, with 46 components from 25 distinct parts.

Other key parts include the CD74HC4053PWR, LM1881MX/NOPB, MAX4395EUD, TS5A4597DCKR and SN74LVC2G17DCKR. By type, the board carries 21 resistors, 14 capacitors, 7 ICs and 2 connectors.

It belongs with the dev boards & breakouts and retro computing designs in this gallery.

From the project

JFF Computer by Skoti modified for compatibility with TMS992xA VDPs

This is an enhanced version of the JFF Computer by @Skoti, which enables the use of the TMS9928A or TMS9929A Video Display Processors (VDPs), in addition to the TMS9918A VDP.

The modified JFF mainboard 1.1b-TMSHAT Build1 has been successfully designed, built and tested (as of Aug 20th, 2025). See warning on the next paragraph.

The TMSRGBCustom TMSHAT Build1 has been successfully designed, built and tested (as of Sep 11th, 2025). It has been successfully tested for RGB output on the modified JFF mainboard 1.1b-TMSHAT Build1 with both a TMS9929A NL (50Hz) and a TMS9928AN (60Hz).

TMSRGBCustom Hat v1 for JFF, from the project README
From the project README

Main components on the TMSRGBCustom Hat v1 for JFF

CD74HC4053PWRLM1881MX/NOPBMAX4395EUDTS5A4597DCKRSN74LVC2G17DCKRLMH1251MT/NOPBTHS7374IPWR

TMSRGBCustom Hat v1 for JFF bill of materials (BOM)

46 components, 25 distinct parts.

QtyPartRefs
1
CD74HC4053PWR
U1
1
LM1881MX/NOPB
U2
1
MAX4395EUD
U3
1
TS5A4597DCKR
U4
1
SN74LVC2G17DCKR
U5
1
LMH1251MT/NOPB
U6
1
THS7374IPWR
U7
1
RGB
J5
1
AV EXT
J13
2
HOLE
HOLE1, HOLE2
12
100nF
C1, C2, C4, C5, C6, C7, C8, C10 +4
1
10nF
C3
1
10uF
C9
1
560K
R1
4
910
R2, R4, R7, R10
1
680
R3
1
160
R5
1
620
R6
2
10K
R8, R15
1
5K6
R9
Show 5 more
QtyPartRefs
4
75
R11, R12, R13, R14
3
470
R16, R17, R18
1
1k
R33
1
180
R35
1
120
R36

TMSRGBCustom Hat v1 for JFF design files

The KiCad project lives in the herraa1/JFF-TMSHAT repository on GitHub; these links point at the commit this page was built from.

TMSRGBCustom Hat v1 for JFF: common questions

How big is the TMSRGBCustom Hat v1 for JFF?

The TMSRGBCustom Hat v1 for JFF measures 56 × 58 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TMSRGBCustom Hat v1 for JFF?

46 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the TMSRGBCustom Hat v1 for JFF design files?

From the herraa1/JFF-TMSHAT repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the TMSRGBCustom Hat v1 for JFF design in my own project?

Yes, under the terms of its GPL-3.0 license, which herraa1 chose for the repository.

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