Editing IBM PS/2 Model 80 (section)

== Planar ==

The Model 80 planar carries:

* '''CPU''': 80386DX, PGA-132, socketed. 16, 20 or 25 MHz depending on submodel.
* '''Optional 80387DX coprocessor''' in a socket adjacent to the 80386DX.
* '''Memory''': 4 × 72-pin SIMM sockets accepting 1, 2 or 4 MB modules. Maximum 16 MB (4 × 4 MB) on planar. Up to 64 MB system memory with MCA Memory Adapter cards. PS/2 72-pin SIMMs are '''proprietary''' to IBM PS/2.
* '''RTC''': Dallas DS1287 / DS12887 (24-pin DIP marked "DALLAS") with integrated lithium cell.
* '''Onboard VGA''': IBM VGA implementation with 256 KB of dedicated VRAM. Same VGA implementation as the Model 70.
* '''MCA bus controller''': 32-bit MCA implementation providing one 8-bit and seven 32-bit slots.
* '''Floppy controller''' integrated on the planar.
* '''Surface-mount aluminium electrolytic capacitors''' for IC bypassing throughout the planar — the same SMD electrolytics that leak on the Model 70.