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x68000:sram_issues [2014/08/10 15:01]
x68000:sram_issues [2019/08/27 20:45]
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-**SRAM Issues** 
-The X68000 has 16KB of battery-backed SRAM, which is used to store basic system settings. It can also store drivers or small programs. Since it's battery-backed,​ and since the batteries that shipped in most X68000s are a decade or two past their useable life, this will cause some problems. Symptoms of a dead or dying battery include loss of settings, the Generic Error, and loss of whatever program was stored in the SRAM. 
-Sometimes the SRAM can get corrupted. This can either be caused by a virus, a dying (but not completely dead) battery, or a sloppily-written program crashing and vomiting all over the SRAM space. If the SRAM is corrupted, you will get this message at boot time instead of a normal "​insert disk" screen: 
-Roughly translated, it reads "​Error. Please reset the computer."​ You can bypass it by leaving a bootable disk in the drive while resetting. You may or may not need to hold down OPT.1 to boot from floppy. 
-How do you get rid of it? First, you need to replace your [[SRAM battery]] if it's old. Then, if you have an XVI or later, just hold down CLR while powering on the machine and it should give you a prompt that will ask you if you want to erase the SRAM and return all settings to their defaults: ​ 
-If you have an older machine the process is more involved. You have two options: 
-The most simplest is to download [[http://​nfggames.com/​X68000/​Misc/​Sram/​SRAMLOAD.Lzh|SRAMLOAD.Lzh]] and use SRAM_CLR.R to clear the contents of SRAM. 
-You can also use a debugger. [[http://​homepage2.nifty.com/​m_kamada/​docs/​unlistedx68k.htm#​startupkey_clr|This site]] reccommends you use the one from [[http://​retropc.net/​x68000/​software/​sharp/​xc21/​index.htm|C Compiler PRO-68K]]. Boot the first disk (an image is in the archive called "​XC2101I.LZH"​). After answering "​N"​ to the prompt that pops up it should dump you back in HumanOS. Then type: 
-''​db \\ 
-mes e8e00d 31 \\ 
-mes ed0000 00 \\ 
-mes e8e00d 00 \\ 
-This should reset the SRAM. Pop the disk out, restart and you should get your normal disk prompt back. Make sure to redo your settings in SWITCH.X, as they'​ll be reset to their default options after this. 
 x68000/sram_issues.txt ยท Last modified: 2019/08/27 20:45 (external edit)
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