Editing Atari Mega STE Troubleshooting (section)

=== RAM (30-pin SIMMs) ===

The Mega STE uses 30-pin SIMMs in groups of four. Mismatched SIMMs, incorrect speed ratings, or failed modules will cause boot failures.

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''RAM Fault Table'''
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! Symptom !! Possible Cause !! Recommended Action
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| No boot, no video || All SIMM banks failed or absent || Verify SIMMs are seated. Try with a single bank of 4 matched SIMMs
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| Random crashes, data corruption || Marginal SIMM; speed too slow for 16 MHz operation || Use 80 ns or faster SIMMs. Test each SIMM individually in a known-good slot
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| Incorrect RAM count reported || Mismatched SIMM sizes in a bank || All four SIMMs in a bank must be identical capacity
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| Boot at 8 MHz but crash at 16 MHz || SIMMs too slow (> 100 ns) || Replace with 80 ns or 70 ns SIMMs
|}