Lomax Thunder 186 Redux
About the Lomax Thunder 186 Redux PCB
Lomax Thunder 186 Redux is an open source PCB design by RichCini, published on GitHub. It is a 4-layer board measuring 253.6 × 137.7 mm, with 116 components from 57 distinct parts.
Other key parts include the LM7805K, 74LS240, 74LS244, 8272A and 82C55A. By type, the board carries 50 ICs, 42 capacitors, 6 connectors, 6 jumpers, 6 resistors and 2 transistors.
From the project
Small repository of files/data related to Lomas Data Products S-100 boards.
Regarding the Concurrent CP/M-86 disks, disk 1 is not readable due to a destroyed directory. Disks 2 and 3 are fine. Pete Higgins did extract the files from each disk and those are posted. Online AI tools did grind away at the image and repaired it enough, but some of the programs need to be replaced, and it's still not bootable. Progress...
The PCDOS-winslow disk is a PC/DOS bootable image that contains Windows 1.0 configured for no mouse and a CGA monitor. It will work with the ColorMagic, but the user experience is bad without a mouse.
Main components on the Lomax Thunder 186 Redux
Lomax Thunder 186 Redux bill of materials (BOM)
116 components, 57 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM7805K | TO-3 | U1 |
| 1 | 74LS240 | DIP-20_W7.62mm_Socket | U2 |
| 5 | 74LS244 | DIP-20_W7.62mm_Socket | U3, U35, U39, U62, U65 |
| 1 | 8272A | DIP-40_W15.24mm_Socket | U4 |
| 1 | 82C55A | DIP-40_W15.24mm | U5 |
| 1 | 74LS156 | DIP-16_W7.62mm_Socket | U17 |
| 5 | 74LS245 | DIP-20_W7.62mm_Socket | U27, U38, U43, U52, U64 |
| 2 | MAX1406CPE+ | DIP-16_W7.62mm_Socket | U28, U31 |
| 2 | 8251A | DIP-28_W15.24mm_Socket | U29, U30 |
| 1 | FDC9216 | DIP-8_W7.62mm_Socket | U32 |
| 2 | 7406 | DIP-14_W7.62mm_Socket | U33, U63 |
| 1 | 74LS138 | DIP-16_W7.62mm_Socket | U34 |
| 2 | PAL16L8 | DIP-20_W7.62mm_Socket | U36, U67 |
| 1 | 80186-3 | 80188 | U37 |
| 2 | 27256 | DIP-28_W15.24mm | U40, U41 |
| 2 | AS6C4008-55PCN | DIP-32_W15.24mm | U44, U51 |
| 3 | 74LS74 | DIP-14_W7.62mm_Socket | U45, U48, U53 |
| 1 | 74LS06 | DIP-14_W7.62mm_Socket | U46 |
| 1 | 74LS175 | DIP-16_W7.62mm_Socket | U47 |
| 3 | 74LS14 | DIP-14_W7.62mm_Socket | U49, U59, U61 |
Show 37 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74LS373 | DIP-20_W7.62mm_Socket | U50, U66, U72 |
| 2 | 74LS157 | DIP-16_W7.62mm_Socket | U54, U55 |
| 1 | 74LS161 | DIP-16_W7.62mm_Socket | U56 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket | U57 |
| 1 | 74LS125 | DIP-14_W7.62mm_Socket | U58 |
| 1 | 74LS153 | DIP-16_W7.62mm_Socket | U60 |
| 1 | 74LS375 | DIP-16_W7.62mm_Socket | U68 |
| 1 | 74LS08 | DIP-14_W7.62mm_Socket | U69 |
| 1 | 74LS32 | DIP-14_W7.62mm_Socket | U70 |
| 1 | LM78L12 | TO-92L | Q1 |
| 1 | L79L12 | TO-92L | Q2 |
| 1 | 16MHz | Oscillator_DIP-8 | X1 |
| 1 | Serial 1 | PinHeader_2x10_P2.54mm_Vertical | J1 |
| 1 | Serial 0 | PinHeader_2x10_P2.54mm_Vertical | J2 |
| 1 | PARALLEL | PinHeader_2x13_P2.54mm_Vertical | J3 |
| 1 | FLOPPY34 | PinHeader_2x17_P2.54mm_Vertical | J4 |
| 1 | FLOPPY50 | PinHeader_2x25_P2.54mm_Vertical | J5 |
| 1 | S100_MALE | S100_MALE | P1 |
| 1 | ROM Size | PinHeader_1x06_P2.54mm_Vertical | JP1 |
| 1 | CLK Delay | PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | SLAVE_CLR | PinHeader_1x02_P2.54mm_Vertical | JP3 |
| 1 | Interrupts | PinHeader_2x14_P2.54mm_Vertical | JP5 |
| 1 | MemSrc | PinHeader_1x03_P2.54mm_Vertical | JP8 |
| 1 | A17 | PinHeader_1x03_P2.54mm_Vertical | JP10 |
| 1 | Settings | DIP-8_W7.62mm_Socket | SW1 |
| 1 | TestPoint | TestPoint_THTPad_1.0x1.0mm_Drill0.5mm | TP1 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 3 | 6.8u | CP_Radial_Tantal_D4.5mm_P2.50mm | C1, C2, C3 |
| 35 | 0.1 uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C5, C10, C11, C12, C13, C14, C15 +27 |
| 3 | 33u | CP_Radial_Tantal_D4.5mm_P2.50mm | C6, C7, C8 |
| 1 | 22u | CP_Radial_Tantal_D4.5mm_P2.50mm | C9 |
| 1 | 4.7kQ | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 1.0k | R_Array_SIP6 | RN1 |
| 1 | 1.0k | R_Array_SIP10 | RN2 |
| 1 | 4.7k | R_Array_SIP5 | RN3 |
| 1 | 4.7k | R_Array_SIP10 | RN4 |
| 1 | 390 | R_Array_SIP6 | RN6 |
Lomax Thunder 186 Redux design files
The KiCad project lives in the RichCini/LomasBoards repository on GitHub; these links point at the commit this page was built from.
Lomax Thunder 186 Redux: common questions
How big is the Lomax Thunder 186 Redux PCB?
The Lomax Thunder 186 Redux measures 253.6 × 137.7 mm, has 4 copper layers and is 4.69 mm thick.
How many components are on the Lomax Thunder 186 Redux?
116 components, from 57 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Lomax Thunder 186 Redux design files?
From the RichCini/LomasBoards repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Lomax Thunder 186 Redux design in my own project?
The repository has no license, so all rights stay with RichCini. Use it as a reference, and ask the author before reusing the design.
