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Panasonic CF-2700

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Panasonic CF-2700
Panasonic CF-2700 service manual drawing
The CF-2700 as drawn on the front page of its service manual
Specifications
ManufacturerMatsushita Electric Industrial (Panasonic brand)
TypeMSX1 home computer
Released1985 (Europe)[1]
Intro price£311 (UK)[1]
CPUNEC µPD780C-1 (Z80A), 3.559 MHz[2]
Memory64 KB RAM, 16 KB video RAM, 32 KB ROM[3]
StorageCassette (FSK, 1200 or 2400 baud), MSX cartridges
DisplayTexas Instruments TMS9929A[3]
SoundGeneral Instrument AY-3-8910A[3]
Power220 V or 240 V AC, 50 Hz, 28 W[3][4]
Dimensions436 × 245 × 90 mm[3]
WeightAbout 3.6 kg[3]
OS / FirmwareMSX-BASIC in ROM
Model no.CF-2700

The Panasonic CF-2700 is an MSX1 home computer made by Matsushita Electric Industrial and sold outside Japan under the Panasonic name from 1985. It is the export version of the National CF-2700, with the keyboard and power supply in one case and two cartridge slots at the top right.[1][5] Matsushita's service manual for the export model is hosted here as the Panasonic CF-2700 Service Manual.

History and versions

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The National CF-2700 went on sale in Japan in October 1984 at ¥59,800, with 32 KB of RAM.[5] The Panasonic CF-2700 followed in 1985 with 64 KB. One version, with a QWERTY keyboard and a £ key, was sold in the United Kingdom, the Netherlands and Spain; the British price was £311.[1] A German version had a QWERTZ keyboard and cost 739 DM.[6] A version with an Ñ key went to Cuba in 1986 for use in schools and carries "Ministerio de Educacion" on the front.[7]

The service manual covers the 220 V model and notes that the British one runs on 240 V.[3] The rating label on a British machine reads 240 V, 50 Hz, 28 W.[4]

Matsushita used the same case for the National CF-1200 and the National FS-1300.[8]

Specifications

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Export CF-2700 (service manual, page 1)
Item Figure
Processor Z80A (NEC µPD780C-1) at 3.559 MHz
ROM 32 KB, MSX-BASIC
RAM 64 KB main, 16 KB video
Video TMS9929A; 32 × 24 or 40 × 24 text, 256 × 192 dots; composite video and RF outputs
Sound AY-3-8910A, 8 octaves, "3 chord output"
Keyboard 73 keys
Cassette FSK, 1200 or 2400 baud
Ports Two cartridge slots, 14-pin printer port, two 9-pin general ports, sound output
Size and weight 436 × 245 × 90 mm, about 3.6 kg
Power 220 V 50 Hz (240 V for the U.K.), 28 W

[3][2]

The Panasonic CF-2700 has no MSX-Engine chip; its functions are spread over separate ICs.[1][6]

Hardware

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Boards

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The parts list divides the export machine into a main board, a video board, a power source board and the keyboard.[9] The main board carries the processor, memory, video and sound chips and the regulators for every rail. The video board holds the PAL encoder (an AN2430), the colour-clock trimmer CT201, the video and sound sockets and the RF modulator. The mains lead runs through the power switch on the left side of the case to a small power source board with a line filter and the primary fuse, and from there to the transformer.[9][10][11]

The manual's main board uses eight DA4164ANL12M DRAMs (IC11 to IC18) and eight µPD416C-3 video RAMs (IC49 to IC56).[9] Each µPD416C-3 is drawn with +5 V, +12 V and −5 V supply connections.[12] Boards differ between batches. A German machine photographed for the MSX Resource Center has a main board marked DFUP0007ZBJ-1, with two DRAMs marked HM50464P-15 at IC11 and IC12, two TMS4416 video RAMs at IC49 and IC50 and a TMS9929NL video chip.[13] A Japanese National CF-2700 has a separate supply board (DFUP0002ZA-1) and a main board marked DFUP0001ZA-1.[14] Identify the board before using the manual's designators.

Power supply

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The supply is linear. The transformer feeds the main board through CN1, and the main board makes +5 V with a discrete regulator round transistor Q1, +12 V with an AN7812R and −12 V with an AN7912T. The −5 V rail comes from −12 V through a resistor divider. There is a T160mA fuse on the power source board and a T3.15A fuse in the +5 V line on the main board.[11]

+5 V and +12 V only run while the PSW line is held at ground. If it is open, the AN7812R shuts down and +5 V follows, because the +5 V regulator takes its reference from +12 V; −12 V and −5 V stay on.[11] On the main board schematic the normally closed contacts of the two slot micro switches are wired in series from ground (CN5 pin 1) to CN5 pin 3, which is the PSW line, and the point between them (CN5 pin 2) goes to a slot connector's SW2 pin while PSW also goes to its SW1 pin.[15] A dirty or corroded switch can therefore keep the supply off until a cartridge is inserted.[16]

Connections

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Slot 1 is connector CN7 and slot 2 is CN6 on the wiring diagram.[15] The MSX Resource Center gives the slot nearer the front as slot 2.[1] The cartridge slots allow 300 mA from each +5 V pin and 50 mA each from +12 V and −12 V, and each joystick port allows 50 mA from its +5 V pin.[17] The rear panel carries the printer and cassette connectors, the sound and video outputs, the RF output and its channel trimmer; the power switch is on the left-hand side.[18]

Documentation

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  • Panasonic CF-2700 Service Manual: Matsushita's service manual for the export model, order no. IED84113035C2, with circuit descriptions, self test, disassembly, adjustments, pinouts, schematics and the parts list.[19]

Repair guides

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See also Capacitor Failure Symptoms.

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  • A British CF-2700
    A British CF-2700
  • Rating label of a British machine
    Rating label of a British machine
  • Main board of a German machine (DFUP0007ZBJ-1)
    Main board of a German machine (DFUP0007ZBJ-1)
  • Power supply circuit from the service manual
    Power supply circuit from the service manual
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References

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  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Panasonic CF-2700 (UK), MSX Resource Center wiki, 7 March 2026—link(accessed 2026-10-21) The National CF-2700 rebranded for the British, Dutch and Spanish markets; 1985; launch price £311 in the United Kingdom and 70,000 pesetas in Spain; 64 KB of RAM where the Japanese machine has 32 KB; TMS9929NL video, AY-3-8910A PSG, NEC D780C-1 CPU, no MSX-Engine; the cartridge port nearer the front is slot 2; 436 × 245 × 90 mm, 3.6 kg.
  2. ↑ 2.0 2.1 Matsushita, Service Manual: Personal Computer CF-2700 (order no. IED84113035C2, 1984), printed page 7, "CPU Peripheral Circuit": Z80A (µPD780C-1, IC8); 74HC04 (IC43) oscillates at 10.6781522 MHz for the VDP clock, which 74LS74 (IC42) and 74LS107 (IC47) divide by three to give the 3.559384 MHz CPU clock and 74LS74 (IC39) halves again to 1.779462 MHz for the PSG; reset from C13 and R26, helped by Q10, so that RESET goes high 60 ms after switch-on; 32 KB mask ROM MN23257 (IC32). See Panasonic CF-2700 Service Manual.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed page 1, "Specifications": Z-80A; 32 KB ROM (MSX-BASIC), 64 KB main RAM, 16 KB video RAM; TMS 9929A; 32 × 24 and 40 × 24 text, 256 × 192 dots; video and RF outputs; AY-3-8910A; 73 keys; FSK cassette at 1200/2400 baud; two slots, a 14-pin printer port, two 9-pin general ports, one sound output; 436 × 245 × 90 mm, about 3.6 kg; 220 V 50 Hz (240 V 50 Hz for the U.K.), 28 W. See Panasonic CF-2700 Service Manual.
  4. ↑ 4.0 4.1 File:Panasonic CF-2700 (UK) rating label.jpg, rating label of a British CF-2700 photographed for the MSX Resource Center wiki: "Panasonic Model No. CF-2700, 240V~ 50Hz 28W, Matsushita Electric Ind. Co., Ltd., Made in Japan".
  5. ↑ 5.0 5.1 National CF-2700, MSX Resource Center wiki, 7 March 2026—link(accessed 2026-10-21) Japanese National CF-2700: October 1984, ¥59,800, 32 KB of RAM in slot 0, 16 KB VRAM, TMS9918A, AY-3-8910A, no MSX-Engine (separate ICs), NEC D780C-1; one unit with keyboard and power supply built in; part of National's "King Kong" range; localised for Europe as the Panasonic CF-2700 (GE) and (UK) and for Cuba as the CF-2700 (CU); the Panasonic version has 64 KB.
  6. ↑ 6.0 6.1 Panasonic CF-2700 (GE), MSX Resource Center wiki, 7 March 2026—link(accessed 2026-10-21) The National CF-2700 rebranded for the German market in 1985, QWERTZ keyboard, launch price 739 DM (ƒ842 in the Netherlands), 64 KB of RAM, TMS9929NL, AY-3-8910A, D780C-1, no MSX-Engine.
  7. ↑ Panasonic CF-2700 (CU), MSX Resource Center wiki, 7 March 2026—link(accessed 2026-10-21) Cuban version, 1986, used in schools and not sold in shops, "Ministerio de Educacion" on the front, Ñ key, 64 KB of RAM.
  8. ↑ ナショナル最後のMSX(1)「FS-1300」, Impress, 1 May 2025—link(accessed 2026-10-21) In Japanese. The FS-1300 was released at the end of 1985 in the case of the CF-1200 and CF-2700.
  9. ↑ 9.0 9.1 9.2 Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed pages 64 to 67, "Replacement Parts List". Main board: AN7812R (IC1), AN7912T (IC2), µPD780C-1 (IC8), DA4164ANL12M DRAMs (IC11 to IC18), MN23257CFH mask ROM (IC32), AN6553 (IC34), AY-3-8910A (IC36), TMS9929AJ (IC38), µPC311C (IC41), 74HC04 (IC43), µPD8255AC-5 (IC45), 74LS145 (IC46), µPD416C-3 video RAMs (IC49 to IC56), relay FBM-450-004 (RY1), connectors CN1 to CN9 with CN6 and CN7 for the slots, CN8 and CN9 for the keyboard, a fuse holder pair and one fuse. Video board: oscillator IC201, AN2430 encoder (IC202), 74LS74A (IC203, IC204), 74LS86 (IC205), trimmer CT201, video and sound pin jacks and RF modulator. Power source block: transformer T101, coil L101, power switch SW101, C101 and C102 (0.1 µF, ECQE2A104M), connectors CN101 and CN102, fuse holder and fuse. Keyboard: power LED LN220RP (D301) and Caps LED LN88RCPP (D302). Cabinet: two slot covers, two slot springs and two micro switches (FBM-438-008).
  10. ↑ Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed page 42, "Wiring Connection Diagram": the mains lead goes through the power switch to CN101 on the power source board, and CN102 on that board feeds the primary of transformer T101; the transformer secondary goes to CN1 on the main board. See Panasonic CF-2700 Service Manual.
  11. ↑ 11.0 11.1 11.2 Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed pages 18 and 19, "Power Supply Circuit", with the diagram on page 19 (File:Panasonic CF-2700 power supply circuit.png). A "dropper" supply for +5 V, −5 V, +12 V and −12 V with a line filter in the primary. +5 V: D7 and D8, reservoir C11 (16 V 6800 µF), pass transistor Q1 (2SA1061P) driven by Q7 (2SC1318-Q), error amplifier Q8 and Q2 (2SA722-S) with the reference divided from +12 V by R5, VR1 and R80, T3.15A fuse, output capacitor C18 (10 V 330 µF). +12 V: D3 and D5, C10 (25 V 4700 µF), IC1 AN7812R, C7 (16 V 330 µF). −12 V: D4 and D6, C6 (25 V 1000 µF), IC2 AN7912T, C12 (16 V 100 µF). −5 V: divider R31 (470 Ω) and R36 (680 Ω) from −12 V, with a 16 V 100 µF capacitor. PSW: held at ground, +5 V and +12 V run; left open, Q9 (2SC1685-Q) conducts, more than about 500 µA flows from pin 4 of IC1 and its output falls to about 0 V, and +5 V follows because its reference comes from +12 V; −12 V and −5 V stay on. R38 and C38 (50 V 3.3 µF) delay the rise of +5 V and +12 V; R37 discharges C38. Power source block: SW101, C101 and C102 (0.1 µF), L101, T160mA fuse; transformer T101 with 5 V, 5 V, GND, 12 V, 12 V secondary connections to CN1.
  12. ↑ Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed page 9, "VDP Peripheral Circuit", Fig. 7: TMS9929 (IC38) and the video RAMs IC49 to IC56 (µPD416C-3), each drawn with +5 V, +12 V and −5 V supply pins (9, 8 and 1); C52 marked 22 µ 10 V and C28 220 µ 16 V; composite video output in PAL. See Panasonic CF-2700 Service Manual.
  13. ↑ File:Panasonic CF-2700 main board, German model.jpg, photograph of a German CF-2700 main board uploaded to the MSX Resource Center wiki by Mars2000you on 7 April 2020. Read from it: board marking DFUP0007ZBJ-1, "Copyright Matsushita Electric Ind. 1984"; NEC D780C-1 at IC8; MN23257 ROM; HM50464P-15 at IC11 and IC12; TMS4416 at IC49 and IC50 (silkscreen also printed µPD41416); TMS9929NL at IC38; cartridge connectors CN6 and CN7; micro-switch connector CN5; a 4700 µF 16 V capacitor near D15 and a position marked C84.
  14. ↑ File:National CF-2700 inside, Japanese model.jpg, photograph of a Japanese CF-2700 uploaded to the MSX Resource Center wiki by Gdx on 30 October 2015: power supply board DFUP0002ZA-1 with its own transformer, joined by a harness to the main board DFUP0001ZA-1.
  15. ↑ 15.0 15.1 Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed page 44, "Schematic Diagram (Main Board)": "SWITCH SLOT 1" and "SWITCH SLOT 2" with terminals C and NC; CN5 pin 1 to ground, pin 3 to the PSW line ("PSW, to page 49") and to pin 44 (SW1) of a slot connector, pin 2 to the junction of the two NC contacts and to pin 46 (SW2). Printed page 42, "Wiring Connection Diagram": micro switches to CN5 as 1 GND, 2 SLOT 1, 3 SLOT 2 (white lead to pin 1); slot 1 is CN7 and slot 2 is CN6. See Panasonic CF-2700 Service Manual.
  16. ↑ Panasonic CF-2700, October and November 2025—link(accessed 2026-10-21) A British CF-2700 that looked unused gave no sign of life. Jipe (28 October 2025): the service manual shows a 160 mA fuse on the power source board and a 3.15 A fuse on the main board; check +5 V, +12 V, −5 V and −12 V and the two micro switches on the slots. mcolom: if the Caps Lock LED can be toggled, the Z80 and ROM are probably working; Briqunullus: the same goes for RAM, and an external RAM cartridge is an easy test. sdsnatcher73 (30 October 2025): the CF-2700 has protection switches in the slots, and if they are dirty or corroded the machine senses a cartridge being inserted and keeps the power supply off until two pins are shorted in the connector; try a cartridge in each slot and clean both switches. The owner (13 November 2025): the fault was a blown T160mA fuse, and the machine worked once it was replaced.
  17. ↑ Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed pages 40 and 41, "Connector Pin Connection". General ports (D-sub 9): 1 FWD, 2 BACK, 3 LEFT, 4 RIGHT, 5 +5 V (50 mA or less), 6 TRG 1, 7 TRG 2, 8 output, 9 GND. Cassette (DIN 8): 1, 2, 3 and 8 GND, 4 CMTOUT, 5 CMTIN, 6 REM+, 7 REM−. Printer (Amphenol 14-pin): 1 strobe, 2 to 9 DATA 0 to DATA 7, 11 BUSY, 14 GND. Slots (50-pin card edge, 2.54 mm): 41 and 43 GND, 42 CLOCK, 44 SW1, 45 and 47 +5 V (300 mA or less), 46 SW2, 48 +12 V (50 mA or less), 49 SUNDIN, 50 −12 V (50 mA or less).
  18. ↑ Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed pages 3 and 4, "Location of Controls and Components": general ports 1 and 2 and slots 1 and 2 at the right-hand end; printer connector, cassette connector, sound, video and RF output jacks and the channel adjust trimmer at the rear; the power switch on the left side; power indicator above the cursor keys; the channel trimmer is set for a clear picture on UHF channels 35 to 37.
  19. ↑ Index of /pub/msx/docs/service_manuals, MSX Archive—link(accessed 2026-10-21) Directory of MSX service manuals, including panasoniccf2700sm.pdf.



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