• SHARP X680x0 Frequently Asked Questions
• Source: [X68K] X68000 FAQ by painkilla
• www.kpark.co.kr

• This FAQ contains undisclosed number of questions, organized and answered by by Mr.Takuma
• Additional information added by Eidis/GameSX

Table of Contents

• 1. Main memory
• 2. Floppy disk
• 3. Hard Disk
• 4. Display
• 5. Keyboard
• 6. Mouse
• 7. RS-232C
• 8. MIDI
• 9. Troubleshooting

Introduction:

SHARP and I/O data were the most recognized expansion card manufacturers.

Their product codes consist of two main parts:

1) The manufacturer:

• CZ - Genuine Sharp
• PIO - I/O data (older models)
• SH - I/O data (newer models)

2) The model number, which should be identical or very similar for both of them.

Question: What memory expansions are available for the X68000 ?

Answer: Each X68000 model is slightly different and here are the possible options for each one of them. The original X68000 and ACE/PRO models must have internal 1Mb expansion unit (Total: 2Mb) before they can be expanded further. The total amount of memory must be set by using SWITCH.X which can be found in HumanOS floppy.

Question: How can I transfer image files from PC to real floppy disks ?

Answer: There are two different procedures. One for 5.25“ drives and the other one for 3.5” drives:

• Writing 5.25" Floppies
• Writing 3.5" Floppies

Question: How can I use different floppy disk formats ?

Answer: Download 9SCSET v3.14r4 and use 9SCDRV driver. Here is the list of supported formats:

• 0 - 2HS (9sec/trk 1440k)
• 1 - 2HD (8sec/trk 1232k) Standard X68000 format
• 2 - 2HDE (9sec/trk 1440k)
• 3 - 2HC (15sec/trk 1200k)
• 4 - 2HT (1599k)
• 5 - 2DD/9 (9sec/trk 720k)
• 6 - 2DD/8 (8sec/trk 640k)
• B - 2HQ (18sec/trk 1440k) IBM 1.44MB 2HD format
• Z - 2HDE98 (FDISK.SYS v0.98 compatible)
• 7 - Initialize FAT
• 8 - Initialize IPL

Question: How can I connect a hard disk to my X68000 ?

Answer: All X68000 models can be equipped with a hard drive and the most modern approach is by using a SCSI to IDE/CF/SD adapter. The earlier X68000 models with SASI (SCSI1 predecessor) require SxSI driver in order to work. SCSI models require specifying boot device ID with SWITCH.X. Here is the list of SASI and SCSI models and links to tutorials:

• Connecting and preparing a hard drive on SASI machine
• X68000 Compact XVI internal SCSI and CF card mod

Question: What monitors are compatible with X68000 ?

Answer: The original X68000 monitor supports 15kHz/24kHz/31kHz display modes. 15kHz is used by TV's and 31kHz by PC monitors. The 24kHz mode is very rarely used and is not important. Approximately 80% of all software uses 31kHz mode, however some of the most desired games run in 15kHz. CRT monitor will provide you with the best possible picture quality. It is possible to use a LCD monitor with upscaler and scanline generator to make the picture look sharp as on CRT and not pixelated/blurred. However, be warned that LCD monitor and upscaler will introduce a small input lag. You have several options:

• Original X68000 monitor
• Microvitec M1438 which was very popular with Amiga enthusiasts and supports all X68000 display modes.
• NEC XM29 (24kHz not supported) or any other PVM CRT monitor which supports 15kHz and 31kHz modes.
• Micomsoft XPC-4 upscaler (manual) + Mini SLG scanline generator.

The following reviews will help you make the decision more easily:

• RetroRGB review of RGB monitors
• Review of Micomsoft upscalers

Question: Do I need a keyboard, which is the best and are there any DIY alternatives ?

Answer: A keyboard is mandatory for everyone who wants to use a hard drive but a system which loads software only from floppies can very well do without it. The pre-compact keyboards are bigger and more durable. They usually cost on Yahoo Auctions somewhere from 8000 Yen but lucky for us there are two DIY PC keyboard converter adapters. In the following links you can see a list of nearly all keyboards which were available for the X68000 and instructions on how to build a DIY keyboard adapter:

• Keyboards
• If you don't have a keyboard

Question: Do I need it ?

Answer: Only if you want to play 1% of games which use it or run SX-Window or other operating systems which require it. It is possible to make a DIY PC mouse converter adapter.

• If you don't have a mouse

Question: How can I transfer files between PC and X68000 ?

Answer: First of all you will need to build a null modem cable for X68000 <> PC data transfers. Then you can use ZM.X or Muterm for data transfers. It is even possible to use the internet through RS-232C. The following links will explain how to do it:

• RS232 null modem cable with partial handshaking
• File transfer between Windows PCs and X68000 machines using null modem cable
• Internet on X68000 using ethernet or null modem cable

Question: What is the maximum transmission speed of RS-232C ?

Answer: It is possible to go up to 76800bps however most software only supports 38400 or 19200bps. 57600bps can not be used because of hardware limitations but 51200bps can be set.

Question: What MIDI boards and configurations are available for the X68000, how do I set it all up and make it work ?

Answer:

Question: What are the most frequent problems with X68000 and which mandatory repairs need to be done ?

Answer: The most important problem is the capacitors. High quality capacitors usually last up to 20 years however it is way past it so they need to be replaced as soon as possible or a simple recaping can turn into a multi feature repair extravaganza. Recap everything you can, especially PSU, floppy drives, main motherboard and sub-motherboard. This will ensure that your X68000 will work for a long time to come. Here is a list of articles which deal with the most common problems and their solutions:

1. SRAM Issues
2. Power Supply Schematics
3. Advanced Floppy Drive repair
4. Soft-power troubleshooting and repair
5. X68000 XVI Compact audio troubleshooting and repair