Thanks for the input. I have only really done much software before too so this is a big jump for me.
Those numbers (8042 - keyboard + extra bits 8253/8254 - Timer 8259 - Interrupt controller 8237 - Possibly you might need DMA controller if you want to use floppy etc) are the identification numbers of the chips themselves right? Cheers, Rex On Fri, 2012-11-23 at 10:57 +0100, Rudolf Marek wrote: > > How hard would it be to design, source components and construct a > > motherboard for something simple such as a 486DX from scratch? > > I'm the software guy but, I think you don't need the chipset, maybe 80386SX > with > static ram aka 62512 and some simple decoders would be good choice. For > dynamic > RAM you would need some controller. For the "legacy" PC i think you need to > implement > > 8042 - keyboard + extra bits > 8253/8254 - Timer > 8259 - Interrupt controller > 8237 - Possibly you might need DMA controller if you want to use floppy etc > > Maybe doing this in some CPLD/FPGA would also be an option. > > For the bus, I would choose ISA... > > 80386SX has 16bit bus so not so many wires. Sufficiently low clocks. > > Thanks > Rudolf > -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
