Editing BBC Micro Model B+ (section)

== PCB Schematics and Service Manual ==

The B+ inherits the bulk of its main-board schematic from the [[BBC Micro Model A/B|Model B]] (Acorn Service Manual Section 1) with B+-specific changes — shadow RAM paging logic, the WD1770 sub-circuit, and the relocated sideways ROM sockets — documented in Section 2.

{| class="wikitable styled-table" style="width:80%; text-align:center;"
! Block Diagram !! Main Schematic
|-
| [[File:BBC Micro BPlus Block Diagram.png|400px]] || [[File:BBC Micro BPlus Main Schematic.png|400px]]
|-
! PSU Schematic !! Keyboard Schematic
|-
| [[File:BBC Micro BPlus PSU Schematic.png|400px]] || [[File:BBC Micro BPlus Keyboard Schematic.png|400px]]
|-
! PCB Layout !! PCB Silkscreen
|-
| [[File:BBC Micro BPlus PCB Layout.png|400px]] || [[File:BBC Micro BPlus PCB Silkscreen.png|400px]]
|-
! PCB Traces !! Assembly (Exploded)
|-
| [[File:BBC Micro BPlus PCB Traces.png|400px]] || [[File:BBC Micro BPlus Assembly Exploded.png|400px]]
|}

All schematics reproduced from the ''Acorn BBC Microcomputer Service Manual'', October 1985 (Sections 1 & 2), mirrored at the Chris's Acorns archive.<ref>[https://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_BBCMicroServiceManual.html Acorn BBC Microcomputer Service Manual, Chris's Acorns]</ref>