Glitch Works XT-IDE Rev 4 — 8-Bit ISA IDE Controller
The Glitch Works XT-IDE rev 4 is an open-source 8-bit ISA IDE controller board that enables the use of modern 16-bit IDE devices (CompactFlash adapters, DOM modules, hard drives) on vintage IBM PC/XT, AT, and compatible systems. Designed in KiCad and licensed under GNU GPL v3.0, the rev 4 improves on the rev 3 with better silkscreen, larger jumper pads, corrected latch read/write timing, additional Slot 8 Support test points, and consistent parts numbering for easier kit assembly. When paired with the XTID
- Bus Interface
- 8-bit ISA (fits any PC/XT/AT 8-bit slot)
- Storage Media
- IDE/ATA — CompactFlash via adapter, DOM, or standard IDE hard drive
- Design Tool
- KiCad (fully open-source EDA)
- License
- GNU GPL v3.0
- PCB
- 2-layer, ISA form factor, through-hole components
- DIP Switch Banks
- 2x CTS 208-8 (8-position each) for address configuration
- EEPROM
- AT28C64B (8KB, 28-pin DIP) — in-system programmable
- Bus Transceivers
- 2x 74LS245 octal bidirectional transceivers
- Latches
- 2x 74F573 octal transparent latches
- Address Decoders
- 2x 74LS688 8-bit magnitude comparators
- Logic ICs
- 74LS138 3-to-8 decoder, 2x 74LS04 hex inverter, 74LS32 quad OR gate
- Pull-up Networks
- 2x 10Kx9 SIP resistor networks (RP1, RP2)
- Bypass Capacitors
- 11x 0.1uF axial ceramic + 1x 100uF 6.3V electrolytic
- Activity LED
- HP HLMP-3507 with 470R current limiting resistors
- BIOS
- XTIDE Universal BIOS — GPLv2, supports up to 4 IDE controllers
- Revision
- Rev 4 (2017) — improved timing, silkscreen, and Slot 8 test points
Assembly and Testing
Construction follows standard through-hole soldering. Install IC sockets first, then passives, headers, and finally ICs. Test before installing flash ROM.
Fully Working Amstrad PC1640SD With Monitor, Keyboard & Boot Disk (Plus Printer) UK
The Amstrad PC1640 family (1987) helped make affordable IBM PC compatibles mainstream in Europe. This entry tracks a complete PC1640SD setup (monitor + keyboard + boot disk), aligned with the XT-Emporium catalog.
- CPU
- Intel 8086 @ 8 MHz
- RAM
- 640 KB
- Storage
- Floppy + HDD variants depending on model
- Graphics
- CGA/EGA compatible (model dependent)
- Manufacturer
- Amstrad plc (UK)
- Released
- 1987
Turbo Clock Switcher - Engineering Application
Clock profile switcher for timing-sensitive software and test harnesses, enabling controlled transitions between true legacy rates and turbo operation.
- Profiles
- 4.77MHz, 8MHz, 12MHz, board turbo
- Switching Logic
- Debounced hardware line with deterministic latch state
- Feedback
- Status LED map plus software verification hooks
- Compatibility
- AT clones, 386SX, selected 486DX boards
- Use Cases
- Cycle-sensitive DOS software and diagnostics harnesses
- Field Harness
- Front-panel and relay control compatible
