page_title: Transformer read-only storage
hierarchical_section_title: Transformer read-only storage
caption_attribution_description: English: IBM System 360/20 TROS.
context_page_description: Transformer read-only storage was a type of read-only memory used in the 1960s and early 1970s before solid-state memory devices were developed.
context_section_description: Transformer read-only storage (TROS) was a type of read-only memory (ROM) used in the 1960s and early 1970s before solid-state memory devices were developed.
caption: Transformer matrix ROM (TROS), from the IBM System/360 Model 40
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