TMS9918
About the TMS9918 PCB
TMS9918 is an open source PCB design by michalin, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 100 mm, with 20 components from 16 distinct parts.
Other key parts include the TMS9918A, HM62256BLP, 74HCT574, 74HCT04 and 74LS02. By type, the board carries 7 ICs, 5 connectors, 4 capacitors, 2 resistors, 1 transistor and 1 crystal.
It belongs with the retro computing and keyboards designs in this gallery.
From the project
Another DIY Z80 Computer With CP/M
The folder CPM/serdisk contains the CP/M programs in up to 16 user folders numbered from 0 to 15. If any of these files have changed, click the "Reload" Button to apply the changes. To access the files from CP/M, type B, followed by the user number 1-15 and a colon. For example B5: gives access to the files under CPM/serdisk/5
The TMS9918 can only display 40 columns, while terminals display 80 columns. This CP/M version is built for 80 columns, but it can be changed to 40 columns. To do this, open the file gencpm.dat, change the constant PAGWID to 28 (Which is 40 in hex) and rebuild the CP/M…
Main components on the TMS9918
TMS9918 bill of materials (BOM)
20 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TMS9918A | DIP-40_W15.24mm_Socket | U1 |
| 1 | HM62256BLP | DIP-28_W15.24mm_Socket | U2 |
| 3 | 74HCT574 | DIP-20_W7.62mm_Socket | U3, U4, U5 |
| 1 | 74HCT04 | DIP-14_W7.62mm_Socket | U6 |
| 1 | 74LS02 | DIP-14_W7.62mm_Socket | U7 |
| 1 | BC547 | TO-92_Inline | Q1 |
| 1 | 10.738635MHz | Crystal_HC49-4H_Vertical | Y1 |
| 1 | Bus in | PinHeader_2x32_P2.54mm_Vertical | J1 |
| 1 | Bus out | PinHeader_2x32_P2.54mm_Vertical | J2 |
| 1 | IO Addr | PinHeader_2x06_P2.54mm_Vertical | J3 |
| 1 | Video out | PinHeader_1x02_P2.54mm_Horizontal | J4 |
| 1 | Conn_01x04_Female | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 3 | 0.1uf | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C8 |
| 1 | 22pf | C_Disc_D3.0mm_W1.6mm_P2.50mm | C7 |
| 1 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
TMS9918 design files
The KiCad project lives in the michalin/ZX2022 repository on GitHub; these links point at the commit this page was built from.
TMS9918: common questions
How big is the TMS9918 PCB?
The TMS9918 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the TMS9918?
20 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the TMS9918 design files?
From the michalin/ZX2022 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the TMS9918 design in my own project?
Yes, under the terms of its GPL-3.0 license, which michalin chose for the repository.
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