198itx
PRECISION ARRAYS / THE MINIMIG 198ITX PROJECT
Classic computing.
Reimagined in hardware.
A Spartan-3 FPGA, six SRAM devices and a physical MC68000. Meet the 170 mm motherboard that brings the original Minimig spirit into a new perspective.
02 / HARDWARE EXPLORER
Explore the current native KiCad board, turn it over, or separate the connector and component groups to reveal the PCB beneath.
Interactive 3D is unavailable. Explore the native renders and assembly drawings below.
View assembly guide ↓The board Current native components, connectors and silkscreen.
Exploded view Separate component groups to see the board beneath.
Both faces Inspect the underside, pads and printed markings.
03 / THE ARCHITECTURE
Follow the design from programmable logic and memory to picture, sound and the connections around the board.
The Spartan-3 FPGA connects to six SRAM devices, the translated MC68000 bus and the AT91SAM7S256 controller.
FOLLOW THE DESIGN
The Spartan-3 FPGA connects to six SRAM devices and a physical MC68000, with an ARM controller handling configuration.
FPGA cores and firmware determine the behaviour of the system.
Explore a functional view of the design, then return to the native model to see the components themselves.
BENEATH THE COMPONENTS
Signal routing, power and ground share a defined six-layer stack. In1.Cu and In3.Cu are ground reference layers. F.Cu, In2.Cu and In4.Cu carry signals and power; B.Cu is named GND but also carries signal routing.
04 / THE BOARD DESIGN
A physical CPU interface and programmable logic share one motherboard. Follow the design from the 68000 bus to the connections that make it a complete system.
198ITX / NATIVE BOARDPHYSICAL 68000 · PROGRAMMABLE LOGIC
A physical 64-pin MC68000 connects to the Spartan-3 through five bus-translator devices. A 16-bit data bus, A1–A23 address lines and processor control signals bring the original architecture into the programmable design.
170 MM / SIX LAYERS170 MM FOOTPRINT · CLASSIC CONNECTIONS
PS/2, DB9 controllers, RGB video and serial preserve the connections of classic computing. microSD, Mini-USB service, an ATX supply connection and front-panel controls complete the board’s hardware interfaces.
Six 1 MiB SRAM devices share a 16-bit data bus and address lines. Each device has its own chip select, giving the FPGA access to 6 MiB of physical memory.
Explore all 17 connection groups in the port map, then turn the native model to see their physical positions.
Explore every connection ↗Minimig 198itx development hardware. The interactive model follows the saved PCB; its exploded view separates component groups for inspection. Firmware and loaded cores determine operating modes and memory mapping.
05 / THE ASSEMBLY BOOK
Five A4 drawings cover top and bottom assembly, stackup, routing and power. Print at 100% for the 1:2 assembly reference plans.
Open the 5-page board guide ↗06 / WHERE WE ARE
The native design brings together a Spartan-3, a physical MC68000 and 6 MiB of SRAM. The model comes directly from the saved KiCad PCB, including components and silkscreen on both faces.
198itx / 98c board geometry · native components throughout.Top and bottom assembly, the six-layer stackup, routing, power and buses. The board guide follows the hierarchical circuit sheets at the end of the KiCad schematic set.
Assembly documentation is included in the schematic project.Bring-up, core and firmware integration, memory mapping and peripheral testing. The native hardware provides the foundation for continued system development.
Hardware and firmware validation continue together.BUILD / ASSEMBLE / EXPLORE
Production files, software and interactive documentation for Minimig v1.98.
Read the engineering guide ↗| Type | File | What it contains |
|---|---|---|
| Production | Gerbers, drills and assembly files | All copper layers, mask, paste, silkscreen, outline, drill maps, component BOM and placement CSV. |
| Schematics | Complete schematic PDF | 33 A4 sheets with consolidated circuits, clear labels and five refreshed board drawings. |
| Documentation | Offline engineering guide | Updated 17 October 2026: HTML guide, interactive BOM, A4 drawings, PDFs and 17 preservation checks. |
| BOM | Component list (CSV) | Component references, values and footprint information from the matching project. |
| Checksums | SHA-256 checksums | Verify the downloaded release packages. |
| ARM + FPGA | S6 core + MM2609S5 ARM firmware | The matched release: redesigned OSD, 20/30/40/50/60 MHz CPU selection, Amiga quadrature mouse and improved timing. Includes SD-card and SAM-BA images with installation notes. |
| Software source | S6 FPGA and ARM source + timing reports | Matching RTL, ARM firmware code, build scripts, tests and timing evidence. Documentation is included as plain text. |
| Release guide | Install the release and choose a CPU clock | Version checks, installation steps, CPU profiles and native Amiga mouse support. |
