GfxTMS9918
About the GfxTMS9918 PCB
GfxTMS9918 is an open source PCB design by ddraig68k, published on GitHub under the MIT license. It is a 4-layer board measuring 100 × 100 mm, with 33 components from 21 distinct parts.
Other key parts include the 74LS125, XC9536PC44, 74LS04, TMS9918A and 74LS574. By type, the board carries 13 capacitors, 8 ICs, 5 resistors, 3 connectors, 1 transistor and 1 crystal.
It belongs with the retro computing designs in this gallery.
From the project
Schematic and CAD files for my 68K based computer
The TMS9918A is capable of a 256x192 pixel display with a 15 colour palette. It has 16K of video memory and 4 different video modes.
The TMS9918A was designed to use DRAM, but I have used the design by Leonardo Miliani that allows SRAM to be used instead.
The TMS9918 can also display up to 32 sprites (4 per scanline).
Main components on the GfxTMS9918
GfxTMS9918 bill of materials (BOM)
33 components, 21 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS125 | DIP-14_W7.62mm_Socket | U1 |
| 1 | XC9536PC44 | PLCC-44_THT-Socket | U2 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket | U3 |
| 1 | TMS9918A | DIP-40_W15.24mm_Socket | U4 |
| 3 | 74LS574 | DIP-20_W7.62mm_Socket | U5, U6, U7 |
| 1 | CY62256-70PC | DIP-28_W15.24mm | U8 |
| 1 | 2N3904 | TO-92_Inline | Q1 |
| 1 | 10.7Mhz | Crystal_HC50_Vertical | Y1 |
| 1 | D68K_64PIN_BOARD | DIN41612_C_2x32_Male_Horizontal_THT | J1 |
| 1 | JTAG | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | CompositeOut | KLPX0848A2RG | J3 |
| 1 | Amber | LED_D5.0mm_FlatTop | D1 |
| 1 | Ferrite_Bead | L_Axial_L6.6mm_D2.7mm_P10.16mm_Horizontal_Vishay_IM-2 | FB1 |
| 9 | 100nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C6, C7, C8, C18, C20 +1 |
| 2 | 22pF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C4, C5 |
| 1 | 0.1uF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C9 |
| 1 | 220uF | CP_Radial_D5.0mm_P2.50mm | C10 |
| 1 | 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 2 | 75R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
GfxTMS9918 design files
The KiCad project lives in the ddraig68k/hardware repository on GitHub; these links point at the commit this page was built from.
GfxTMS9918: common questions
How big is the GfxTMS9918 PCB?
The GfxTMS9918 measures 100 × 100 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the GfxTMS9918?
33 components, from 21 distinct parts. The full bill of materials is listed on this page.
Where can I download the GfxTMS9918 design files?
From the ddraig68k/hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the GfxTMS9918 design in my own project?
Yes, under the terms of its MIT license, which ddraig68k chose for the repository.
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