Editing BTC 51 series (section)

===5149===
ISO layout; PCB and controller chip are marked "5139", which indicates that the 5139/5149/5169 are sharing the same PCB, further proven by most if not all 5139 PCBs have contact pads to accommodate different layouts. This version has been found to suffer from [[ghosting]]; normally, potential ghosts are blocked, but playing Tyrian Destruct with two-player keyboard sharing revealed a flaw where a ghost could be emitted, requiring player 2 to use the alternative set of keys.

<gallery widths="250" heights="187">
File:Packard Bell 5149 -- front.jpg
File:Packard Bell 5149 -- rear.jpg|Rear view
File:Packard Bell 5149 -- rear label.jpg|Rear label
File:Packard Bell 5149 -- upper shell with sliders and loose domes.jpg|Loose domes over the sliders
File:Packard Bell 5149 -- PCB with dome sheets.jpg|Dome sheets over the PCB
File:Packard Bell 5149 -- loose domes.jpg|Loose domes; the single yellow dome is from the space bar
File:Packard Bell 5149 -- domes.jpg|All 102 domes
File:Packard Bell 5149 -- sliders.jpg|[[Keycap mount#Cherry MX mount|Cherry MX mount]] sliders
File:Packard Bell 5149 -- PCB, rear.jpg|PCB, rear
File:Packard Bell 5149 -- controller.jpg|[[Keyboard controller]] from Zilog
File:Packard Bell 5149 -- cable connector and earthing wire.jpg|Cable connector and earthing wire
File:Packard Bell 5149 -- cable label.jpg|Warning label on PS/2 cable
</gallery><br />