Following a clear-out, we now have one BBC Master and one Model B in good working order.

BBC Master 128 (01-AMB15-0222432)

• fully working
• ROM fitted: WE Transferom DD
• ROM fitted: Logotron LOGO
• Marked “MJL” but probably donated to Hacklab.
• Batteries replaced in modern era.
• Case in reasonable condition but yellowed and dirty.
• No Econet module.

BBC Model B (Hacklab asset #27)

• Fully working
• Issue 7 board
• 8271 disk controller
• Econet
• ZIF ROM socket
• ROMs: OS 1.20, BASIC, DNFS 1.21, Wordwise
• PSU capacitors replaced 2018-01.
• Case in good condition. Clean and intact, minor scuffs only.

Acorn Electron (07-ALA01-0053496):

• Acorn Electron Plus 3 floppy module (04-ALA13-0102022)
• 21V power supply

BBC Model B (02-ANB03-1004089):

• Untested

Peripherals:

• Single 5.25“ 80-track floppy drive
• External 6502 Second Processor
• Microvitec CUB 1451 monitor, serial number 128754
• AMX mouse
• STAG SE15 PROM Eraser [Al Bennett]

Cables:

• Cassette DIN-7 to DIN-3 + 2.5mm remote
• 2x Cassette DIN-7 to DIN-7
• 3x Monitor RGB

Books:

• BBC Microcomputer System User Guide
• The Advanced User Guide for the BBC Micro
• BBC Master Reference Manual Part One
• The Beginner's Programming Handbook in BASIC and Machine Code [Martin]

Software:

• Acornsoft Elite (5.25” floppy)

Other:

• Assorted ROMs and EEPROMs
• Assorted 5.25“ floppies (data and blanks), cleaning kit

Unsorted donation box containing:

• Joystick
• Assorted 5.25” floppies
• RGB to UHF modulator
• 5.25“ floppy drive in enclosure
• 5.25” floppy drive without enclosure

BBC Master 128 (01-AMB15-0011778) * No PSU * No Econet module * No TV modulator * Minor case damage (one missing cartridge slot cover and spring, cracked cartridge slot, minor scratching) * Motherboard has wires soldered to power connectors * Econet header is bent * Keyboard missing “8” key * Keyboard has damaged ribbon cable * OS ROM appears upgraded with a stacked socket (VLI / 551 VM 9481 / 231024-1028 / 0201,843-0 / Acorn / SING-T)

BBC Model B (Hacklab asset #21) * Issue 7 * Case: fair, dirty, no cracks/breaks/scratching, modifications to rear panel (3.5mm socket, two toggle switches, two other holes) * WE 1770 upgrade * WE 32K RAMCARD * ROM fitted: 1770 DFS * ROM fitted: WE 32K RAM * No Econet * No keyboard * Not working (motherboard known to be faulty)

Accessories

• Microvitec CUB 1451, serial number 128754, metal/cube, working, dirty, missing one case screw
• Microvitec CUB 1451/DS4, serial number 272506, plastic
• RGB cable - 2m moulded, new
• RGB cable - 1m DIY
• RGB cable - 1m DIY
• Watford Electronics dual 5.25“ floppy drives in monitor plinth - Switchable 40/80 track. Appears to work.
• Stag SE15 PROM eraser [Al]

Parts * Model B keyboard 21242 - no keys, some missing switches * Model B keyboard 12252 - all keys present, some track damage and repairs, bent connector * Model B keyboard 05042 - all keys present, reasonable condition but untested, ribbon cable included

Box 1

• 6502 Second Processor (external “cheese wedge”) 03-ANC01-1005471 - working
• Component box containing:
  • EPROMs
  • MC68854P
  • DM74LS245N (x2)
  • SN74ALS245AN (x4)
  • SN74LS245N (x2)
  • HM6264LP-15
  • Wordwise Plus
  • ARM
  • ADFS
  • Micron Plus 1.30
  • XTALK 2.08W
  • WE DFS
  • R65C02P3 11450-13 8642
  • 8143 SY6502A
• 7-pin DIN to 3-pin DIN and 2.5mm plug (3x unopened, for cassette recorder)
• 7-pin DIN to 7-pin DIN (2x)
• 5-pin DIN to 3.5mm plug
• BBC Model B PSU, C2 capacitor replaced 2013-03-05
• AMX mouse
• Set parts from a Model B: 4 short screws, BNC connector, short wire
• 5.25” floppy drive cleaning kit
• 3.5“ floppy disc
• Model B keyboard ribbon cable
• 5.25” floppy drive mechanism (marked “Do not use, I eat discs”)
• Watford Electronics single 5.25“ floppy drive (computer-powered) - 80 track only, appears to work.
• Watford Electronics dual/stacked 5.25” floppy drive (computer-powered) - 40 track only, Belongs to Al

Box 2

• Books (see separate list)
• Assorted 5.25“ floppy discs
• Blank 5.25” floppy discs
• Cassette recorder
• R6522P ICs (x3)
• The Hobbit (cassette for BBC Micro, Beam Software 1983)
• HCR Electronics Micron Plus 64K EPROM Programmer
• Acornsoft Elite (5.25“ for BBC Micro)
• Dust cover for BBC Model B
• Watford Electronics ROM/RAM board
• Watford Electronics 12 ROM board (with selection of ROMs fitted)
• Solidisk BBC Sideways RAM board
• ZIF ROM socket extension
• Assorted screws
• ZIF socket (component part only)

How to make and install a replacement battery pack for a BBC Master

Some debugging information

• Decide what to keep
• Clean the ones that we keep
• Fixes to the kept Model B:
  • Remove stray jumper wire
  • Re-fit composite video connector
  • Swap broken clear keystrip with other Model B
  • Consider 1770 upgrade (take from other Model B)
• Fit Econet to kept computers
• Test floppy drives

Keep:

• one BBC Master (the one that's working)
• one BBC Model B (the one that's working)
• single 5.25” floppy drive
• 6502 Second Processor (they're rare)
• 1 CUB monitors (the one with the classic boxy metal case)
• a few books

Dispose of:

• Non-working BBC Master
• Non-working BBC Model B
• floppy-drive/monitor-stand
• 1 CUB monitor

We're going to build an econet.