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Sharp X68030

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Sharp X68030
Sharp X68030 and X68000 Expert
An X68030 (left, with the red badge) beside an X68000 EXPERT, with one X68000 keyboard in front (photo: Manupkp, CC BY-SA 4.0)
Specifications
ManufacturerSharp
TypePersonal computer
ReleasedMarch 1993[1]
Intro price¥398,000 (CZ-500C); ¥488,000 (CZ-510C)[2]
CPUMotorola MC68EC030 at 25 MHz[1][3]
Memory4 MB, expandable to 12 MB inside the case[3]
StorageTwo 5.25-inch 2HD floppy drives; 80 MB SCSI hard disk in the CZ-510C[1]
Display—
SoundYamaha YM2151 FM with YM3012 DAC; OKI MSM6258 ADPCM[4]
FPU / coprocessorMC68882 (optional, PLCC socket)[3][2]
Power100 V AC[5]
OS / FirmwareHuman68k 3.0, SX-Window 3.0[2]
PredecessorSharp X68000 XVI
Model no.CZ-500C, CZ-510C (HD)

The Sharp X68030 is the 68030-based successor to the Sharp X68000 series, sold by Sharp in Japan from March 1993 as the CZ-500C and, with an 80 MB hard disk, the CZ-510C.[1] It replaces the X68000's 68000 with a Motorola MC68EC030 running at 25 MHz and has 4 MB of RAM as standard.[1][3] The case keeps the twin-tower layout of the Sharp X68000 XVI, and the power supply is the same type as the XVI's.[2][6] A smaller X68030 Compact with 3.5-inch drives followed in May 1993.[1]

Apart from the processor, most of the design comes from the X68000. The graphics hardware, sound chips and most of the I/O are carried over, while the memory controller, system controller and clock generator were redesigned for the 32-bit processor.[3] Many programs written for the 68000 models needed patches to run on it.[2]

History

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Sharp released the X68030 in March 1993, after the X68000 XVI and the X68000 Compact.[1] The CZ-500C cost ¥398,000 and the CZ-510C, with its internal 80 MB hard disk, ¥488,000. Both came in titanium black with a red X68030 badge.[2] The X68030 Compact, CZ-300C and CZ-310C, followed in May 1993.[1] The X68030 models were the last in the X68000 line.[2]

Sharp later issued the service manuals for the X68030 (CZ-500C-B/CZ-510C-B) and the X68030 Compact as free electronic books on its COCORO BOOKS store in March 2016.[7][6] The circuit diagrams reproduced in Kuwano Masahiko's 1994 book X68030 Inside/Out are hosted here as the Sharp X68030 Schematic.[5]

Hardware

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Processor and memory

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The MC68EC030 is an MC68030 without the memory management unit.[3] It sits in a socket so that it can be replaced with a faster part or a full MC68030, and the start-up screen reports an MMU when one is fitted.[2] The MC68882 floating-point coprocessor is an option. Its socket, IC43, takes the PLCC version, and the coprocessor talks to the CPU directly instead of being driven through software as on the X68000.[3][8]

The 4 MB on the main board is made up of eight HM514402A chips, IC27 to IC34.[8] These are Hitachi static column DRAMs, which allow accesses within a page without wait states.[2] Memory is expanded inside the case: the CZ-5BE4 board adds 4 MB and the CZ-5ME4 module adds another 4 MB on top of it, for 12 MB in all.[3]

The BIOS and character fonts are in two 8 Mbit mask ROMs, iX2138CE and iX2139CE, each wired as a 256K × 16 device.[3] The main board schematic also shows positions IC3 and IC4 for 27C4096 EPROMs, selected in place of the mask ROMs by a link marked ROM SW.[8]

Holding XF3 or XF4 while the machine starts adds wait states so that it runs at the speed of the 10 MHz X68000 or the 16 MHz XVI. The CPU clock itself stays at 25 MHz, and the register that reports the CPU type and clock always reads $DC.[9][2]

Custom chips and boards

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Sharp X68030 main board component side (X68030 Inside Out)
Sharp's drawing of the component side of the X68030 main board K7929DE, with the MC68EC030 and MC68882 sockets left of centre and the eight HM514402A DRAMs at the top right

Three custom chips are new. YUKI (iX2136CE) is the memory controller, SAKI (iX2137CE) the system controller, and OSCIAN2 (iX1856CE) the clock generator, which adds a 640 × 480 mode. The CPU, ROM, main memory and coprocessor share a 32-bit bus, and SAKI converts for the 16-bit I/O devices. The DMA and CRT circuits run at 16 MHz and the expansion slots at 10 MHz.[3] The video chips CYNTHIA, VICON, VIPS and CATHY are carried over from the X68000.[8][2]

The schematic set names eight circuit boards and the power supply.[8][4][5][10]

X68030 boards (Sharp schematic set)
Board Unit number Main parts
Main board (K7929DE) DUNTK7929DE01 MC68EC030, MC68882 socket, YUKI, SAKI, HD63450 DMA, 4 MB DRAM, ROMs, video chips
Control board DUNTK7930DE01 I/O controller PEDEC (IX1604), MFP MC68901, SCC Z8530, FDC µPD72065B, SCSI MB89352, YM2151, YM3012, MSM6258, RTC RF5C15, backup cell
Analogue board DUNTK7931DE01 RGB output buffers and the 15-pin display connector
I/O board DUNTK7932DE01 Expansion slot connectors
SCSI connector board DUNTK7933DE01 External SCSI connector, ID switch, terminators
FD connector board DUNTK7934DE01 External floppy drive connector
LED boards DUNTK7935DE01 Drive lamps
FDD eject board DUNTK7936DE01 Eject switches
Power supply UADP-0069CEZZ Switching supply (the SH4)

Power supply

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The power supply runs from 100 V mains through fuse F1 (125 V, 4 A) and a switching converter built round MOSFET Q1. It feeds the control board through connector A (+5 V, +12 V, −12 V, the +5 V standby rail VCC2 and a power-control line), the main board through connector B (+5 V), the floppy drives through P/Q and the hard disk through D. A second, small converter round transformer T2 makes VCC2, the supply for the power switch circuit and the backup cell's charging circuit. The supply drawing also shows an AC 100 V outlet rated at 300 W.[5] The POWER switch itself is on the control board and runs from VCC2.[4]

Japanese owners call this supply the SH4. The X68000 EXPERT, EXPERT II, SUPER and XVI use the same type.[6] Mashiron's ATX cable and AC adapter conversion kits, sold by BEEP, list the CZ-500C and CZ-510C among the models they fit.[11]

Storage and SCSI

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The two 5.25-inch drives belong to the same drive family as those of the ACE to XVI.[12] The X68030 has a SCSI interface on the control board, an MB89352 controller.[4] It is electrically SCSI-1, but the X68030 can boot from removable SCSI devices such as magneto-optical drives.[2] The CZ-510C has an internal 2.5-inch SCSI hard disk; the CZ-500C has no cable for one.[2][13]

The rotary switch on the SCSI connector board sets the SCSI ID of the internal hard disk, not of the computer. The disk reads three of the 40 lines in the flat cable, and the control board leaves those lines unconnected.[3][14]

Connectors changed from the X68000

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Sharp brought several connectors into line with the Compact models. The stereoscope socket and the see-through colour socket were removed. The image input socket for the colour image unit changed from a 25-pin D-sub to a 30-pin half-pitch connector, the SCSI connector to a 50-pin half-pitch type, and the external floppy connector from a 37-pin D-sub to a 40-pin half-pitch connector. The half-pitch connectors are 3M-compatible.[15] Some X68000 peripherals cannot be used with it, and others need different cables.[15]

In the expansion slots the X68030 drops some signals that Sharp's own boards never used, and pin A35 carries an auto-vector signal, EXAVEC, in place of EXVPA.[16]

Memory backup

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The 16 KB SRAM that holds the memory switch settings and boot device, IC1 and IC2 on the main board, runs from a backup supply when the machine is off.[9][8] The backup cell, marked BATT, is on the control board and also keeps the RF5C15 clock chip running. The schematic shows it charged from VCC2 through R205 (1 kΩ), R204 (2.4 kΩ) and one diode of D206, so the original is a rechargeable cell; the schematic does not give its type.[4]

X68030 Compact

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The X68030 Compact (CZ-300C, ¥388,000) and X68030 Compact-HD (CZ-310C, 80 MB hard disk, ¥478,000) went on sale in May 1993.[1][2] They have the same processor and 4 MB of memory in an upright case that is not a twin tower, with 3.5-inch drives that read 2HD and 2DD discs and a keyboard without a numeric pad.[2] The Compact uses a different power supply, the SH7, shared with the X68000 Compact.[6][17] Its expansion slots lack the remote power and backup power lines of the tower model, and it has no SCSI ID switch.[16][13] The 060Turbo accelerator fits the CZ-500C and CZ-510C but not the Compact.[18] The repair guides linked below cover the tower models, the CZ-500C and CZ-510C.

Specifications

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X68030 (CZ-500C, CZ-510C) specifications
Item Specification
CPU Motorola MC68EC030, 25 MHz, socketed[1][2]
Coprocessor MC68882, optional, PLCC socket IC43[3][8]
Main memory 4 MB (eight HM514402A static column DRAMs), 12 MB maximum with the CZ-5BE4 board and CZ-5ME4 module[3][8]
ROM Two 8 Mbit mask ROMs, iX2138CE and iX2139CE[3]
Backed-up memory 16 KB SRAM at $ED0000 to $ED3FFF[9]
Video CYNTHIA, VICON, VIPS and CATHY video chips; OSCIAN2 clock generator with a 640 × 480 mode[3][8]
Sound YM2151 FM with YM3012 DAC; MSM6258 ADPCM[4]
Floppy drives Two 5.25-inch 2HD[1]
Hard disk CZ-510C: 80 MB 2.5-inch SCSI[1][2]
Interfaces SCSI (half-pitch 50-pin), external floppy (40-pin half-pitch), image input (30-pin half-pitch), two expansion slots[15][10]
Software Human68k 3.0 and SX-Window 3.0; Human68k 2.15 in ROM[2]
Power 100 V AC[5]

Known faults

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  • The power supply is the SH4 type, and its electrolytic capacitors leak with age. Electrolyte that reaches the board can short the parts round R33 and R34 and destroy the power transistor beside them.[6][19] See the Sharp X68030 Troubleshooting Guide and the Sharp X68030 Capacitor Replacement Guide.
  • Sharp's schematic draws C27, C28 and C31 in the supply with reversed polarity marks; fit replacements by the board markings.[20][5]
  • The machine does not start if the SCSI connector board is unplugged.[13]
  • Floppy drives suffer from rust and dust round the head motor as well as from leaking capacitors.[12]
  • The backup cell on the control board loses charge or leaks, and the SRAM settings are then lost.[4][9]

Documentation

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Repair guides

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References

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  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 X68000, IPSJ Computer Museum, Information Processing Society of Japan—link(accessed 2026-10-21) Series table: X68030, first sold March 1993, CZ-500C, 68030 at 25 MHz, 4 MB, two 5.25-inch drives, no hard disk; X68030-HD, CZ-510C, 4 MB, 80 MB hard disk; X68030 Compact, May 1993, CZ-300C, 3.5-inch drives; X68030 Compact-HD, CZ-310C, 80 MB hard disk.
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 X68000, Wikipedia (Japanese)—link(accessed 2026-10-21) Section "X68030" and the model table: CZ-500C ¥398,000 and CZ-510C (80 MB) ¥488,000, March 1993, colour code -B, red X68030 badge; MC68EC030 at 25 MHz in a socket, which can take a faster part or an MC68030 with MMU, reported by the start-up screen; Hitachi static column DRAM, 4 MB standard and 12 MB maximum inside the case; PLCC socket for an MC68881 or MC68882; 2.5-inch SCSI hard disk in the HD models; XF3, XF4 or XF5 held at start-up selects 10, 16 or 25 MHz operation; Human68k 3.0 and SX-Window 3.0 supplied, with Human68k 2.15 in ROM; SCSI electrically SCSI-1; 5-inch model's hard disk mounting shared with the XVI; many X68000 programs needed patches; X68030 Compact CZ-300C ¥388,000 and CZ-310C ¥478,000 (May 1993) with 3.5-inch 2HD/2DD drives; the XVI and X68030 keep the twin-tower outline with sharper corners; the Compact models have a single-unit case and a keyboard without a numeric pad; the X68030 was effectively the last model of the series.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 桑野雅彦 (Kuwano Masahiko), X68030 Inside/Out, SoftBank, 30 March 1994, pp. 11 to 16, chapter "X68000とX68030の違い" (differences between the X68000 and X68030). Internet Archive item X68030InsideOut1994. Comparison with the X68000 XVI: CPU changed from MC68HC000 to MC68EC030 at 25 MHz (XVI and Compact XVI 16 MHz); memory controller iX1748CE (ASA) replaced by iX2136CE (YUKI), system controller iX1749CE (DOSA) by iX2137CE (SAKI), clock generator iX1096CE (OSCIAN) by iX1856CE (OSCIAN2) for the 640 × 480 mode; CPU, ROM, main memory and coprocessor on a 32-bit bus, other I/O on a 16-bit bus converted by SAKI, DMA and CRT circuits at 16 MHz and the I/O slots at 10 MHz; coprocessor MC68882 in a package that does not fit the X68000; two 8 Mbit (512K × 16) mask ROMs, iX2138CE (upper 16 bits) and iX2139CE (lower 16 bits), each used as 256K × 16 with the top address pin tied to 0 V; 4 MB on the main board plus internal board CZ-5BE4 (4 MB) and module CZ-5ME4 (4 MB), 12 MB in all; internal hard disk ID set by a rotary switch on the hard disk connector board through the 40-way flat cable, with the ID lines left unconnected on the control board.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Sharp, control board basic wiring diagram (コントロール基本配線図), in the X68030 schematic set reproduced in Kuwano, X68030 Inside/Out (1994). File:Sharp X68030 Schematic (X68030 Inside Out, 1994).pdf, PDF pages 11 to 13 (diagram, component side, solder side). Board DUNTK7930DE01 (QPWBX7930CEZZ): IC207 PEDEC (IX1604), IC223 MB89352 SCSI controller, IC215 µPD72065B floppy controller, IC224 SED9420A data separator, IC206 Z8530 SCC, IC208 MC68901 MFP, IC211 YM2151, IC217 YM3012 (IX0937), IC212 MSM6258, IC229 and IC218 MC3403, IC213 NJM2073 headphone amplifier, IC201 TL7705 reset, IC205 RF5C15 clock with X201 (32.768 kHz) and trimmer C205; backup cell BATT charged from VCC2 through R205 (1 kΩ), R204 (2.4 kΩ) and D206 (MA716), feeding VBT; power switch SW-P0351CE on VCC2; supply connector A-1 to A-6 (VCC1, GND, VCC3, VCC4, VCC2, PW.CNT); the solder-side drawing marks the cell BATT as a round part beside the main board connector.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Sharp, power supply basic wiring diagram (電源部基本配線図), board UADP-0069CEZZ, in the X68030 schematic set reproduced in Kuwano, X68030 Inside/Out (1994). File:Sharp X68030 Schematic (X68030 Inside Out, 1994).pdf, PDF page 19. AC 100 V input (125 V 7 A), power switch (125 V 10 A), rear AC 100 V outlet (300 W); F1 125 V 4 A; DB1 RBV404M; C9 470 µF 180 V; Q1 2SK643/2SK724/2SK735; output connectors A (control board: A1 +5 V, A2 GND, A3 +12 V, A4 −12 V, A5 +5 V VCC2, A6 P.C), B (main board: +5 V, GND), P/Q (floppy drives: +12 V, GND, +5 V) and D (hard disk: +5 V, GND, +12 V); IC22 SI3122V (+12 V), IC23 µPC78M12HF with its output to ground giving −12 V, IC31 µPC78M05HF (VCC2) on the T2 standby converter with Q31 2SC2333 and Q32 2SC1815; fan MMF06B12DM on +12 V.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 X68000シリーズ電源のハンダ面から見た抵抗配置図– Kunihiko Ohnaka (kunichiko), 2020-10-10—link(accessed 2026-10-21) Table of supplies by model, from Poe's site: SH4 in the EXPERT, EXPERT II, SUPER, XVI and X68030 (CZ-500C, CZ-510C); SH7 in the Compact and the X68030 Compact (CZ-300C, CZ-310C). Solder-side resistor maps and in-circuit resistance measurements taken from an X68030's SH4. Recommends replacing leaking electrolytics first and notes that faults such as an open transformer winding or a failed transistor are not visible. SH4 schematics are in the XVI and X68030 service manuals on COCORO BOOKS.
  7. ↑ 7.0 7.1 サービスマニュアル X68030 CZ-500C-B/CZ-510C-B, COCORO BOOKS, Sharp Marketing Japan—link(accessed 2026-10-21) Listing: price ¥0, publisher and author Sharp Corporation, series 復刻サービスマニュアルX68030 (reissued service manuals), 137.9 MB, electronic edition issued 10 March 2016, printed edition March 1993; read with the COCORO BOOKS Android, iOS and Windows apps or in the browser.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 Sharp, main board basic wiring diagrams (メイン基本配線図) (1) to (7), in the X68030 schematic set reproduced in Kuwano, X68030 Inside/Out (1994). File:Sharp X68030 Schematic (X68030 Inside Out, 1994).pdf, PDF pages 2 to 8. Sheet 1: IC42 MC68EC030, IC35 HD63450 DMA controller. Sheet 2: IC10 YUKI (IX2136CE), X1 50 MHz and X2 20 MHz oscillators, supply inputs T-1A to T-5A to VCC1 to VCC4 with C3, C4, C6 and C15. Sheet 3: IC45 SAKI (IX2137CE), +5 V input B1/B2 with C17 and C18, TIMER, HD BUSY and POWER lamps. Sheet 4: IC27 to IC34 HM514402A DRAM, IC43 MC68882-25 (option), IC5 and IC6 8 Mbit mask ROMs, IC1 and IC2 64 kbit SRAMs on the VBT backup supply, ROM SW selecting between the mask ROMs and IC3/IC4. Sheet 6: IC53 CYNTHIA (IX0906), IC76 VICON (IX1093), IC58 VIPS (IX1095), IC75 CATHY (IX1094), IC52 OSCIAN2 (IX1856), IC78 CXA1260Q-Z with C33, C34 and C37; board numbers DUNTK7929DE01 and QPWBX7929CEZZ. Sheet 7: IC3 and IC4 27C4096.
  9. ↑ 9.0 9.1 9.2 9.3 Kuwano, X68030 Inside/Out, pp. 108 and 109, system ports: with XF3 held at start-up the BIOS sets the wait port to $0A, with XF4 to $04, giving X68000 and X68000 XVI speed; the CPU-type and clock port always reads $DC (68030, 25 MHz) although the user's manual describes 10 and 16 MHz modes; the 16 KB SRAM at $ED0000 to $ED3FFF holds the memory switch settings and boot device, is kept alive by backup power, and is write-protected through a system port.
  10. ↑ 10.0 10.1 Sharp, analogue board basic wiring diagram (アナログ基本配線図) and I/O, FD connector, SCSI connector and LED basic wiring diagram, in the X68030 schematic set reproduced in Kuwano, X68030 Inside/Out (1994). File:Sharp X68030 Schematic (X68030 Inside Out, 1994).pdf, PDF pages 14 to 18. Analogue board DUNTK7931DE01: RGB buffers Q401 to Q403 (2SC1815Y) with level presets VR401 to VR403 (220 Ω) and output capacitors C402 to C404 (470 µF 6.3 V), 15-pin RGB connector with audio L and R. I/O board DUNTK7932DE01 (expansion slot connectors CN1 and CN2) with C501, C503, C505 and C507 (47 µF). SCSI connector board DUNTK7933DE01 with the ID switch and terminator networks RM601 and RM602 (220/330 Ω). FD connector board DUNTK7934DE01, LED boards DUNTK7935DE01, floppy eject switch board DUNTK7936DE01.
  11. ↑ [TB60EB] SHARP X68000用ACアダプタ化セット EXPERT/SUPER/XVI/030用, BEEP—link(accessed 2026-10-21) Replaces the internal supply with a small ATX supply board and a 12 V 5 A adapter using connectors matching the original; compatible models listed include the CZ-500C X68030 and CZ-510C X68030-HD; not for modified machines. The companion ATX cable [TBE] (product 1313) lists the same models and needs a 24-pin ATX supply of 100 W or more.
  12. ↑ 12.0 12.1 SHARP X68000 FDD K61432-71 K61432-72 K-61435-72 修理– Poe, 2020-02-23—link(accessed 2026-10-21) Drive types: K-61432-71 for the first model only, K-61432-72 (later K-61435-72) for the ACE to X68030, a PRO type, and the 3.5-inch drive of the Compact and X68030 Compact. Versions 02 to 07 of the ACE to X68030 drive; 06 is K-61435-72 with control board K36-0291-02 and spindle board YG-H2; 07 is the last version, fitted to late machines such as the XVI and X68030 but not always, with parts that have no substitute; a drive that does not lock the disc after insertion has a faulty wheel board or index sensor and needs replacing. Photographs of X68030 CZ-500C drives: rust on top of the spindle motor; iron dust and dust collecting at the root of the head motor's flexible cable, where rust starts; on later drives, failures from dust and rust are more common than leaking capacitors. Capacitor list for versions 03, 04 and 07. Do not remove the spindle or stepping motor just to change capacitors, because head alignment depends on index timing; fit the E-ring with its sharp-edged side up.
  13. ↑ 13.0 13.1 13.2 X68030 SCSI Adventure Part 1– buffi, 2025-02-17—link(accessed 2026-10-21) CZ-500C: proper SCSI, but no cabling for an internal hard disk (the CZ-510C has it); a non-standard 40-pin flat cable runs from the board to the SCSI I/O board; the I/O board carries the connectors, the ID switch, a 330/220 Ω terminating network, capacitors and a 1 A fuse for the external power line, and is held by two screws on top of the external floppy I/O board; the machine does not start if the SCSI board is not connected; external connector is a half-pitch 50-way (Amphenol half-pitch 50); the X68030 Compact has no ID switch.
  14. ↑ X68030 SCSI Adventure Part 3– buffi, 2025-02-18—link(accessed 2026-10-21) The ID switch on the SCSI I/O board connects to pins 1 to 3 of the HC connector, which go nowhere on the main board side.
  15. ↑ 15.0 15.1 15.2 Kuwano, X68030 Inside/Out, pp. 16 to 20: stereoscope terminal and see-through colour terminal removed; image input connector changed from a 25-pin D-sub to a 30-pin half-pitch connector carrying the see-through colour, display TV control and external sync signals; all half-pitch connectors are 3M-compatible; the external SCSI connector changed to the half-pitch type (the tower X68000 models used a 50-pin Amphenol connector); external floppy connector changed from a 37-pin D-sub to a 40-pin half-pitch connector.
  16. ↑ 16.0 16.1 Kuwano, X68030 Inside/Out, pp. 113 and 114, expansion slot: pin A35 changed from EXVPA to EXAVEC; IDDIR can be driven by a bus-master board; CPU-space accesses not passed to the slots; signals for 6800-family peripherals and unused DRAM control signals removed; the Compact models also omit the remote power on/off signal and the backup power supply on the slot; Sharp's option boards do not use the removed signals.
  17. ↑ SHARP X68000 修理– Poe—link(accessed 2026-10-21) Power supply table: CZ-500C and CZ-510C X68030 with the SH4, where D27 is sometimes a two-lead part of unknown type, in which case J23 is changed to J19; CZ-300C and CZ-310C X68030 Compact with the SH7, whose T2 transformer is not interchangeable. Keyboards: X68030 DSETK0023CE04 with Alps yellow switches; X68030 Compact DSETK0025CE01 (CMA-600N0). Floppy drive lists: ACE to 68030 drives K-61433-03, K-61435-72 and K36-0291-02 for versions 06 and 07 (film terminal); Compact drives K36-0312-06, K36-0339-01 and Sankyo MSBA020K02.
  18. ↑ SHARP X680x0– DEKO—link(accessed 2026-10-21) Hardware list: 060Turbo (MK060T, MK060TH), an MC68060 accelerator sold by Mankai Seisakusho for the X68030 CZ-500C and CZ-510C only, which cannot physically be fitted to the X68030 Compact; X68030 D'ash, a 33 MHz version sold by Mankai Seisakusho.
  19. ↑ X68kXVI HDの電源リペア– Fram, 2015-05-24—link(accessed 2026-10-21) XVI-HD supply in the left tower: "Long Life" electrolytics had leaked, electrolyte ran onto both sides of the board and down to the base board; the leaked electrolyte is conductive and shorted the zener diode, R33/R34 and a transistor, the power transistor below them burst and the fuse blew; all capacitors and the burnt parts replaced after cleaning the board; the supply turns its outputs on when the main switch is on, so it can be tested out of the machine; backup cell replaced by a CR2032 in a holder.
  20. ↑ 【訂正】X68kの電源ユニットのシルク印刷に間違いがあった件&X68kの電源修理再び(未完)3– Fram, 2024—link(accessed 2026-10-21) Corrected 6 April: the silkscreen on the SH4 board is right and the service manual schematic is wrong; measured with a meter, C31 sits as the silkscreen shows; the schematic also draws C27 and C28 with reversed polarity and the transformer polarity dots cannot be trusted. A replacement ZD31 with stiff legs bent at the body had cracked and failed again.


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