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x68000:black_screen_on_xvi_hd_and_potentially_other_hd_computers [2018/12/28 17:04]
leonk [Problem and solution]
x68000:black_screen_on_xvi_hd_and_potentially_other_hd_computers [2019/08/27 20:45]
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-===== Background ===== 
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-All X68000 computers suffer from the same 2 main problems: 
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-  * Bad power supply (due to blown capacitors and other failures) 
-  * Dead SRAM save battery 
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-Assuming you did a full capacitor kit on the computer, replaced or fixed the power supply and installed a new save battery to store SRAM settings, a good working X68000 will typically show you the following screen: 
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-{{:​x68000:​insert_disk.png?​nolink&​400|}} 
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-But on an XVI HD and potentially other HD computers, you might get a black screen. ​ This tutorial will show you how to fix this problem. 
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-===== Verify you have a good computer ===== 
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-Boot up the computer while holding the CLR button. ​ If you get a screen asking you to initialize the SRAM, press Y.  You can also verify you have a good working computer by pressing the INTERRUPT button on the top.  If Japanese text pops up, then the video subsystem and system ROM is working correctly. 
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-===== Problem and solution ===== 
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-It seems the HD version of the X68000 computers requires a hard drive to boot.  The SCSI hard drive chain beings at the bottom I/O board, it connects to the external I/O adapter and lastly ends at the internal drive. The end of a SCSI chain must always have terminating resistors. ​ Internal hard drives, or external hard drives/​CD-ROM drives will have these at the end of the chain. 
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-If you don't have any SCSI devices connected, the system ROM hangs waiting for the SCSI device. 
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-To solve this problem, simply connect a SCSI device to the external output (like the SCSI2SD solution) or an internal SCSI hard drive with a terminator. Or, you can add an external SCSI terminator to the SCSI port, or add the missing terminator resistors internally (the internal resistors might prevent you from using an external SCSI2SD solution) 
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-You can also confirm you have this problem by looking at the external I/O adapter. ​ As you can see in the picture, the terminating resistors are missing (empty black sockets under the ribbon cable) 
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-{{:​x68000:​scsi_connector.png?​nolink&​400|}} 
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-Here's how an externally terminated connector will look like, when it's terminated internal to the X68000. 
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-{{:​x68000:​scsi_terminated.png?​nolink&​400|}} 
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-Installing an external terminator on the SCSI-1 connector (Centronics 50 pin male external passive terminator) should also close the SCSI bus and make the floppy drives bootable, preventing the boot ROM from hanging the system. ​ 
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-{{:​x68000:​scsi_ext_terminator.png?​nolink&​400|}} 
  
 
 x68000/black_screen_on_xvi_hd_and_potentially_other_hd_computers.txt ยท Last modified: 2019/08/27 20:45 (external edit)
 
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