Initial layout plan. Bracketed area in the top right is where normal PC I/O goes.
This backplane is initially intended to be used with with a PC/104 compute board for legacy ISA card applications. It aims to implement the complete 16-bit ISA bus specification in a microATX form factor. In future, the PCI bus could also be implemented, allowing use of PC/104-Plus (ISA and PCI), or PCI/104 (PCI only) compute boards.
This project was based on spark2k06's Universal ITX Backplane, but is heavily modified to focus on PC/104 support and in a microATX form factor. More information visit spark2k06's project on their Hackaday page.
The project is mostly unfinished. No layout exists, most of the schematic is unfinished.
- Standard microATX board
- 2x ISA 8-/16-bit slots (1 shared with PCI slot)
- 3x 32-bit PCI slots (1 shared with ISA slot)
- 1x PC/104, PC/104+, PCI-104 connection
- Compatibility with modern ATX power supplies
- Compatibility with modern ATX computer cases
- Standard ATX I/O shield area with connectors bringing PC/104 connections to the rear of an ATX case
- IBM, Personal Computer XT Hardware Technical Reference, Apr. 1983
- Intel, ATX Multi Rail Desktop Power Supply Design Guide, Revision 003, Jun. 2020
- Intel, ATX Specification, Version 2.2, 2004
- Intel, ISA Bus Specification and Application Notes, Revision 2.01, 12 Sep. 1989
- Intel, microATX Motherboard Interface Specification, Version 1.2, 2004
- PC/104 Embedded Consortium, PC/104 Specification, Version 2.6, 13 Oct. 2008
- PC/104 Embedded Consortium, PC/104-Plus Specification, Version 2.3, 13 Oct. 2008
- Tom Shanley and Don Anderson, ISA System Architecture, Third Edition, 1995