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A comment on 80286 ATX mainboard based on the IBM 5170 AT PC. Parent comment
LS125 - 3-state bus buffers - https://www.ti.com/lit/ds/symlink/sn54ls125a.pdf?ts=17314810...
LS612 - Memory mappers - https://media.digikey.com/pdf/Data%20Sheets/Rochester%20PDFs...
8259 - Interrupt controller - https://en.wikipedia.org/wiki/Intel_8259
27C256 - ROM - https://ww1.microchip.com/downloads/aemDocuments/documents/O...
Most of it is somewhat more high-level than the 7400-series ICs and such you might find in something older like the early 6502-based microcomputer motherboards.
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LS125 - 3-state bus buffers - https://www.ti.com/lit/ds/symlink/sn54ls125a.pdf?ts=17314810...
LS612 - Memory mappers - https://media.digikey.com/pdf/Data%20Sheets/Rochester%20PDFs...
8259 - Interrupt controller - https://en.wikipedia.org/wiki/Intel_8259
27C256 - ROM - https://ww1.microchip.com/downloads/aemDocuments/documents/O...
Most of it is somewhat more high-level than the 7400-series ICs and such you might find in something older like the early 6502-based microcomputer motherboards.