Acorn Archimedes A3000 Maintenance Guide: Difference between revisions
PSU: permit safe servicing/recap of the mains PSU for restoration; strengthen lethal-shock warnings and discharge procedure (replaces exchange-only/do-not-open wording) |
Rewrite from A3000 Service Manual: Acorn's cover removal steps, B1 checks (LK6, IC6 pin 8), PSU spec and PL3/PL4 check, floppy checks, parts by designator; remove uncited PSU-recap, belt and A5000 comparison text; corrosion photo |
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[[File:Acorn Archimedes A3000 | [[File:Acorn Archimedes A3000 main PCB with battery corrosion.jpg|thumb|360x360px|An A3000 main board (0180,000 Issue 3) with corrosion from a leaking backup cell at the bottom left.]] | ||
The [[Acorn Archimedes A3000]] is Acorn's ARM2 keyboard-case machine of 1989, with the main board, power supply, floppy drive and keyboard in one case. Its backup cell, B1, is a NiCd soldered to the main board, and leakage from it corrodes the board. Acorn's [[Acorn A3000 Service Manual]] gives the disassembly steps, test points and parts list for the machine. | |||
== | == Safety == | ||
Warning: the power supply in the case runs from the mains. Acorn's service manual says dangerous voltages are exposed once the cover is off, and the computer must be unplugged before the cover is removed.<ref name="sm-dis">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, pp. 31-32 (disassembly and reassembly). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | |||
* | * Acorn specifies antistatic matting and a wrist strap for all servicing.<ref name="sm-fd">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, pp. 33-43 (fault diagnosis: test equipment, warnings, "dead" computer flowchart and functional tests). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | ||
* The | * The supply is set for 240 V or 120 V by a link wire to the pin marked 240 or 120 on the supply. If the setting is changed, Acorn asks for a label on the outside of the case and a mains plug suited to the new supply.<ref name="sm-psu">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, p. 19 (power supply performance and input voltage selection). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | ||
* | * After refitting or replacing an assembly, Acorn requires an earth continuity test on the assembled computer (Appendix B, p. 57).<ref name="sm-fd" /> | ||
== | == Identify your board == | ||
The | The part number and issue are printed on the board. Chris Whytehead documents two: 0280,000 Issue A, with VL2333-QC ARM2, and 0180,000 Issue 3, with VL86C010-10QC ARM2.<ref name="chris3000">Chris Whytehead, [https://chrisacorns.computinghistory.org.uk/Computers/A3000.html "BBC A3000"], Chris's Acorns, The Centre for Computing History.</ref> Acorn's service manual describes Issue 1 boards and lists what changed from Issue A on p. 23.<ref name="sm-iss">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, p. 23 (changes between Issue A and Issue 1 PCBs). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | ||
{| class="wikitable styled-table" style="width:100%; text-align:center;" | {| class="wikitable styled-table" style="width:100%; text-align:center;" | ||
|+''' | |+'''A3000 main board, principal parts (Service Manual parts list, pp. 52-53)'''<ref name="sm-parts">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, pp. 51-54 (parts lists). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | ||
! | ! Designator !! Part !! Notes | ||
|- | |- | ||
| | | IC37 || ARM2 || Surface-mounted | ||
|- | |- | ||
| | | IC44 || MEMC1a || Surface-mounted | ||
|- | |- | ||
| | | IC41 || VIDC1a || Surface-mounted | ||
|- | |- | ||
| | | IC13 || IOC || Surface-mounted | ||
|- | |- | ||
| | | IC14-IC17 || RISC OS ROMs 1-4 || Socketed | ||
|- | |- | ||
| | | IC20-IC27 || 256K × 4 DRAM, 1 MB in total || | ||
|- | |- | ||
| | | IC36 || 1772 floppy disc controller || | ||
|- | |- | ||
| | | IC2 || Keyboard controller (8051) || | ||
|- | |- | ||
| | | IC6 || 8583 clock and CMOS RAM || Backed by B1 | ||
|- | |||
| IC32, IC38 || LM386 audio amplifiers || | |||
|- | |||
| X3 || 24 MHz crystal || System clock | |||
|- | |||
| X2 || 32.768 kHz crystal || Clock chip | |||
|- | |||
| B1 || NiCd 1.2 V 280 mAh, part 0817,013 || Soldered to the board | |||
|} | |} | ||
= | Acorn says not to remove the four surface-mounted chips without surface-mount training and equipment.<ref name="sm-fd" /> | ||
== Opening the case == | |||
Acorn's procedure for removing the cover:<ref name="sm-dis" /> | |||
== | # Disconnect all peripherals and unplug the computer from the mains. | ||
# Unplug the mouse from the underside. | |||
# Remove the centre fixing screw on the underside. | |||
# Remove the two screws from the clips at the rear. | |||
# Unhook the two clips and lift the back of the cover slightly, pivoting on the front. | |||
# Find the three rectangular holes on the front underside. Insert a screwdriver at the rear edge of each in turn and push and twist until the catch comes free. | |||
# Lift the cover clear. Refitting is the reverse, skipping step 6. | |||
The keyboard connector is easily damaged. Hold it by the white plastic strengthening strip only, and do not touch the track faces or press on the cable. The floppy drive is held by four recessed screws in the base. To take out the main board, remove the cover, keyboard, floppy drive and any RAM upgrade, unplug the red (+5 V) and black (0 V) power leads at the board and the two speaker leads, remove the right-hand speaker, and undo the three self-tapping screws; the board and rear panel then lift out.<ref name="sm-dis" /> | |||
== Backup battery == | |||
B1 keeps the clock and CMOS RAM alive. It is a 1.2 V 280 mAh NiCd, Acorn part 0817,013, soldered to the board at the bottom left beside the ROMs.<ref name="sm-parts" /><ref name="chris3000" /> Leakage from it corrodes the board in that corner; Chris Whytehead's Issue A board has corrosion there and does not work.<ref name="chris3000" /> | |||
# Inspect the bottom-left corner of the board, around B1, the keyboard connectors and the ROM sockets, for green or white deposits and darkened tracks. | |||
# Check the cell with Acorn's figures. LK6 is the battery test point: pin 2 should read 1.2 V ± 0.2 V against pin 1.<ref name="sm-links">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, p. 20 (links table). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> With the power off, IC6 pin 8 should read about 1.1 V; if it is absent, check R3 and R7, and if it is below 1 V, change B1 and check D2 and C15.<ref name="sm-fault">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, pp. 45-50 (main PCB fault diagnosis and repair). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | |||
# To remove B1, use a soldering iron and a desoldering gun. Acorn says sites without the equipment and experience should not attempt it because the board is easily damaged, and warns against shorting the cell's terminals even on a cell being thrown away.<ref name="sm-dis" /> | |||
# Clean any leakage, then check the tracks in the affected area for continuity before fitting a new cell. NiCd electrolyte is alkaline; [[Battery Explosion, Capacitor or Corrosion Damage]] covers neutralising and cleaning it. | |||
LK5 on the board is Acorn's connection point for an external battery, provided in case the on-board NiCd became a problem.<ref name="sm-links" /> The case base has a battery compartment with a screwed cover to the right of the mouse socket, unused on standard machines.<ref name="chris3000" /> [[Battery Refurbishment]] lists the cells Acorn fitted across the range. | |||
== | == Cleaning == | ||
* Brush and | * Brush and blow dust from the board, the supply's vents and the floppy drive. | ||
* Clean the rear | * Clean the rear connectors and the internal expansion sockets (SK3, SK8, SK9, SK11) with contact cleaner if a card is unreliable.<ref name="sm-exp">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, p. 25 (internal expansion connectors). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> | ||
* | * The keyboard comes out after the cover; handle its connector as described above. | ||
== Floppy drive == | == Floppy drive == | ||
The | The drive is a one-inch-high 3.5-inch unit, 1 MB unformatted, running from +5 V on a 4-pin power connector (pin 1 +5 V, pins 2 and 3 ground).<ref name="sm-fdd">Acorn Computers, ''A3000 Service Manual'', part 0480,050, issue 1, September 1989, p. 19 (floppy disc drive specification and connectors). Hosted on this wiki as [[Acorn A3000 Service Manual]].</ref> Chris Whytehead's two machines have Citizen OSDC-65C drives.<ref name="chris3000" /> Acorn's checks when the drive misbehaves: the configuration items STEP and FLOPPIES are set correctly, the drive ID switch is at zero, the cables are connected at both ends with +5 V and 0 V present on the power cable, and the drive ID plate has not fallen off inside the drive and jammed it.<ref name="sm-fault" /> General drive care is on [[Floppy Drive Repair]]. | ||
== Power supply checks == | == Power supply checks == | ||
The supply has one output, +5 V, delivered to the board on two faston tabs: PL3 is 0 V and PL4 is +5 V.<ref name="sm-parts" /><ref name="sm-fd" /> | |||
{| class="wikitable styled-table" style="width:80%; text-align:center;" | {| class="wikitable styled-table" style="width:80%; text-align:center;" | ||
|+'''A3000 | |+'''A3000 power supply specification (Service Manual p. 19)'''<ref name="sm-psu" /> | ||
! Parameter !! Value | ! Parameter !! Value | ||
|- | |- | ||
| Output voltage | | Output voltage || 4.9-5.1 V (5 V nominal) | ||
|- | |||
| Output current || 0.5-4.4 A | |||
|- | |- | ||
| | | Ripple and noise || 50 mV peak to peak (0-50 MHz) | ||
|- | |- | ||
| | | Over-voltage threshold || 5.8-7.0 V | ||
|- | |- | ||
| | | Power || 22 W continuous, 29 W surge | ||
|- | |- | ||
| | | Input || 198-264 V at 47-53 Hz, or 99-130 V at 57-63 Hz | ||
|} | |} | ||
If | If +5 V is missing at PL4, Acorn's flowchart has you disconnect the floppy drive and check again. If the rail returns, the drive is at fault; if not, test the board for a short circuit, and replace the supply if the board is clear.<ref name="sm-fd" /> Acorn's manual treats the supply as a unit and gives no component data for it.<ref name="sm-dis" /> | ||
== | == Capacitors == | ||
The | The board's electrolytics are leaded radial and axial parts, with twelve leaded tantalums. Acorn's service manual notes that C23-C33 on the printer port occasionally go open circuit.<ref name="sm-fault" /> The full list with part numbers is on the [[Acorn Archimedes A3000 Capacitor Guide]]. | ||
== Common failure points == | == Common failure points == | ||
{| class="wikitable styled-table" style="width:100%; text-align:left;" | |||
{| class="wikitable styled-table" style="width:100%; text-align: | |+'''A3000 failure points named by Acorn and Chris Whytehead''' | ||
|+''' | ! Item !! Symptom !! Check | ||
! Item !! Symptom !! | |||
|- | |- | ||
| | | B1 backup cell || Clock and settings lost; corrosion at the bottom left || LK6 1.2 V ± 0.2 V; IC6 pin 8 about 1.1 V with power off<ref name="sm-links" /><ref name="sm-fault" /> | ||
|- | |- | ||
| | | Printer port capacitors C23-C33 || Printer problems || Check for open-circuit capacitors<ref name="sm-fault" /> | ||
|- | |- | ||
| | | Configuration || Unstable or scrolling display || Type <code>*CON. SYNC 1</code> and press Reset<ref name="sm-fault" /> | ||
|- | |- | ||
| ROM sockets | | ROM sockets IC14-IC17 || Dead after a ROM change || Data and address activity on all four ROMs; a screwdriver used for ROM removal can damage tracks, sockets or legs<ref name="sm-fault" /> | ||
|- | |- | ||
| | | Floppy drive || Drive not recognised || Configuration, ID switch, cables, +5 V, jammed ID plate<ref name="sm-fault" /> | ||
|} | |} | ||
== | == Tools == | ||
See [[Recommended Tools]] | Acorn's list for fault diagnosis is a 100 MHz oscilloscope, a DC voltmeter, an earth continuity tester, the serial port loopback plug (part 0280,087), 32 Ω headphones, IC extraction tools, antistatic matting and wrist straps, and standard hand tools.<ref name="sm-fd" /> Use an IC extraction tool on the ROMs. Removing B1 needs a desoldering gun or station. See also [[Recommended Tools]]. | ||
== | == Maintenance checklist == | ||
# | # Open the case and inspect B1 and the board around it. Remove a leaking cell and clean the board. | ||
# | # Measure +5 V at PL4 (4.9-5.1 V). | ||
# | # Inspect the electrolytics for swelling or leakage. | ||
# | # Clean the expansion sockets and rear connectors. | ||
# | # Check the floppy drive reads a known good disc. | ||
# Refit the cover and carry out Acorn's earth continuity test. | |||
== Related pages == | == Related pages == | ||
| Line 131: | Line 146: | ||
* [[Acorn Archimedes A3000 Troubleshooting Guide]] | * [[Acorn Archimedes A3000 Troubleshooting Guide]] | ||
* [[Acorn Archimedes A3000 Capacitor Guide]] | * [[Acorn Archimedes A3000 Capacitor Guide]] | ||
* [[Acorn A3000 Service Manual]] and [[Acorn A3000 Technical Reference Manual]] | |||
* [[Acorn A3000 Service Manual]] | * [[Battery Explosion, Capacitor or Corrosion Damage]] | ||
* [[Capacitor | * [[Recommended Tools]] | ||
== References == | == References == | ||
Latest revision as of 07:45, 1 October 2026
The Acorn Archimedes A3000 is Acorn's ARM2 keyboard-case machine of 1989, with the main board, power supply, floppy drive and keyboard in one case. Its backup cell, B1, is a NiCd soldered to the main board, and leakage from it corrodes the board. Acorn's Acorn A3000 Service Manual gives the disassembly steps, test points and parts list for the machine.
Safety
[edit | edit source]Warning: the power supply in the case runs from the mains. Acorn's service manual says dangerous voltages are exposed once the cover is off, and the computer must be unplugged before the cover is removed.[1]
- Acorn specifies antistatic matting and a wrist strap for all servicing.[2]
- The supply is set for 240 V or 120 V by a link wire to the pin marked 240 or 120 on the supply. If the setting is changed, Acorn asks for a label on the outside of the case and a mains plug suited to the new supply.[3]
- After refitting or replacing an assembly, Acorn requires an earth continuity test on the assembled computer (Appendix B, p. 57).[2]
Identify your board
[edit | edit source]The part number and issue are printed on the board. Chris Whytehead documents two: 0280,000 Issue A, with VL2333-QC ARM2, and 0180,000 Issue 3, with VL86C010-10QC ARM2.[4] Acorn's service manual describes Issue 1 boards and lists what changed from Issue A on p. 23.[5]
| Designator | Part | Notes |
|---|---|---|
| IC37 | ARM2 | Surface-mounted |
| IC44 | MEMC1a | Surface-mounted |
| IC41 | VIDC1a | Surface-mounted |
| IC13 | IOC | Surface-mounted |
| IC14-IC17 | RISC OS ROMs 1-4 | Socketed |
| IC20-IC27 | 256K × 4 DRAM, 1 MB in total | |
| IC36 | 1772 floppy disc controller | |
| IC2 | Keyboard controller (8051) | |
| IC6 | 8583 clock and CMOS RAM | Backed by B1 |
| IC32, IC38 | LM386 audio amplifiers | |
| X3 | 24 MHz crystal | System clock |
| X2 | 32.768 kHz crystal | Clock chip |
| B1 | NiCd 1.2 V 280 mAh, part 0817,013 | Soldered to the board |
Acorn says not to remove the four surface-mounted chips without surface-mount training and equipment.[2]
Opening the case
[edit | edit source]Acorn's procedure for removing the cover:[1]
- Disconnect all peripherals and unplug the computer from the mains.
- Unplug the mouse from the underside.
- Remove the centre fixing screw on the underside.
- Remove the two screws from the clips at the rear.
- Unhook the two clips and lift the back of the cover slightly, pivoting on the front.
- Find the three rectangular holes on the front underside. Insert a screwdriver at the rear edge of each in turn and push and twist until the catch comes free.
- Lift the cover clear. Refitting is the reverse, skipping step 6.
The keyboard connector is easily damaged. Hold it by the white plastic strengthening strip only, and do not touch the track faces or press on the cable. The floppy drive is held by four recessed screws in the base. To take out the main board, remove the cover, keyboard, floppy drive and any RAM upgrade, unplug the red (+5 V) and black (0 V) power leads at the board and the two speaker leads, remove the right-hand speaker, and undo the three self-tapping screws; the board and rear panel then lift out.[1]
Backup battery
[edit | edit source]B1 keeps the clock and CMOS RAM alive. It is a 1.2 V 280 mAh NiCd, Acorn part 0817,013, soldered to the board at the bottom left beside the ROMs.[6][4] Leakage from it corrodes the board in that corner; Chris Whytehead's Issue A board has corrosion there and does not work.[4]
- Inspect the bottom-left corner of the board, around B1, the keyboard connectors and the ROM sockets, for green or white deposits and darkened tracks.
- Check the cell with Acorn's figures. LK6 is the battery test point: pin 2 should read 1.2 V ± 0.2 V against pin 1.[7] With the power off, IC6 pin 8 should read about 1.1 V; if it is absent, check R3 and R7, and if it is below 1 V, change B1 and check D2 and C15.[8]
- To remove B1, use a soldering iron and a desoldering gun. Acorn says sites without the equipment and experience should not attempt it because the board is easily damaged, and warns against shorting the cell's terminals even on a cell being thrown away.[1]
- Clean any leakage, then check the tracks in the affected area for continuity before fitting a new cell. NiCd electrolyte is alkaline; Battery Explosion, Capacitor or Corrosion Damage covers neutralising and cleaning it.
LK5 on the board is Acorn's connection point for an external battery, provided in case the on-board NiCd became a problem.[7] The case base has a battery compartment with a screwed cover to the right of the mouse socket, unused on standard machines.[4] Battery Refurbishment lists the cells Acorn fitted across the range.
Cleaning
[edit | edit source]- Brush and blow dust from the board, the supply's vents and the floppy drive.
- Clean the rear connectors and the internal expansion sockets (SK3, SK8, SK9, SK11) with contact cleaner if a card is unreliable.[9]
- The keyboard comes out after the cover; handle its connector as described above.
Floppy drive
[edit | edit source]The drive is a one-inch-high 3.5-inch unit, 1 MB unformatted, running from +5 V on a 4-pin power connector (pin 1 +5 V, pins 2 and 3 ground).[10] Chris Whytehead's two machines have Citizen OSDC-65C drives.[4] Acorn's checks when the drive misbehaves: the configuration items STEP and FLOPPIES are set correctly, the drive ID switch is at zero, the cables are connected at both ends with +5 V and 0 V present on the power cable, and the drive ID plate has not fallen off inside the drive and jammed it.[8] General drive care is on Floppy Drive Repair.
Power supply checks
[edit | edit source]The supply has one output, +5 V, delivered to the board on two faston tabs: PL3 is 0 V and PL4 is +5 V.[6][2]
| Parameter | Value |
|---|---|
| Output voltage | 4.9-5.1 V (5 V nominal) |
| Output current | 0.5-4.4 A |
| Ripple and noise | 50 mV peak to peak (0-50 MHz) |
| Over-voltage threshold | 5.8-7.0 V |
| Power | 22 W continuous, 29 W surge |
| Input | 198-264 V at 47-53 Hz, or 99-130 V at 57-63 Hz |
If +5 V is missing at PL4, Acorn's flowchart has you disconnect the floppy drive and check again. If the rail returns, the drive is at fault; if not, test the board for a short circuit, and replace the supply if the board is clear.[2] Acorn's manual treats the supply as a unit and gives no component data for it.[1]
Capacitors
[edit | edit source]The board's electrolytics are leaded radial and axial parts, with twelve leaded tantalums. Acorn's service manual notes that C23-C33 on the printer port occasionally go open circuit.[8] The full list with part numbers is on the Acorn Archimedes A3000 Capacitor Guide.
Common failure points
[edit | edit source]| Item | Symptom | Check |
|---|---|---|
| B1 backup cell | Clock and settings lost; corrosion at the bottom left | LK6 1.2 V ± 0.2 V; IC6 pin 8 about 1.1 V with power off[7][8] |
| Printer port capacitors C23-C33 | Printer problems | Check for open-circuit capacitors[8] |
| Configuration | Unstable or scrolling display | Type *CON. SYNC 1 and press Reset[8]
|
| ROM sockets IC14-IC17 | Dead after a ROM change | Data and address activity on all four ROMs; a screwdriver used for ROM removal can damage tracks, sockets or legs[8] |
| Floppy drive | Drive not recognised | Configuration, ID switch, cables, +5 V, jammed ID plate[8] |
Tools
[edit | edit source]Acorn's list for fault diagnosis is a 100 MHz oscilloscope, a DC voltmeter, an earth continuity tester, the serial port loopback plug (part 0280,087), 32 Ω headphones, IC extraction tools, antistatic matting and wrist straps, and standard hand tools.[2] Use an IC extraction tool on the ROMs. Removing B1 needs a desoldering gun or station. See also Recommended Tools.
Maintenance checklist
[edit | edit source]- Open the case and inspect B1 and the board around it. Remove a leaking cell and clean the board.
- Measure +5 V at PL4 (4.9-5.1 V).
- Inspect the electrolytics for swelling or leakage.
- Clean the expansion sockets and rear connectors.
- Check the floppy drive reads a known good disc.
- Refit the cover and carry out Acorn's earth continuity test.
Related pages
[edit | edit source]- Acorn Archimedes A3000
- Acorn Archimedes A3000 Troubleshooting Guide
- Acorn Archimedes A3000 Capacitor Guide
- Acorn A3000 Service Manual and Acorn A3000 Technical Reference Manual
- Battery Explosion, Capacitor or Corrosion Damage
- Recommended Tools
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, pp. 31-32 (disassembly and reassembly). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, pp. 33-43 (fault diagnosis: test equipment, warnings, "dead" computer flowchart and functional tests). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 3.0 3.1 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, p. 19 (power supply performance and input voltage selection). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 4.0 4.1 4.2 4.3 4.4 Chris Whytehead, "BBC A3000", Chris's Acorns, The Centre for Computing History.
- ↑ Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, p. 23 (changes between Issue A and Issue 1 PCBs). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 6.0 6.1 6.2 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, pp. 51-54 (parts lists). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 7.0 7.1 7.2 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, p. 20 (links table). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, pp. 45-50 (main PCB fault diagnosis and repair). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, p. 25 (internal expansion connectors). Hosted on this wiki as Acorn A3000 Service Manual.
- ↑ Acorn Computers, A3000 Service Manual, part 0480,050, issue 1, September 1989, p. 19 (floppy disc drive specification and connectors). Hosted on this wiki as Acorn A3000 Service Manual.