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¶ Summary
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IBM Model F AT |
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| Manufacturer(s) | IBM |
| Branding | Same as above |
| Layout | AT |
| Keyswitches | Capacitive Buckling Springs |
| Keycaps | Dye-sublimated PBT |
| Interface(s) | Set 2 (AT / PS/2) |
| Weight | 5.2lbs / 2.4kg |
| Dimensions | 22 x 8 x 2 in |
| Year(s) Produced | 1987 - 1999 |
The IBM Model F Advanced Technology is a capacitive buckling spring keyboard with the AT layout, popularized by this keyboard. The IBM Model F AT was manufactured and sold by IBM with the IBM Personal Computer AT from 1984 to 1987.
¶ Details
The IBM F AT uses a two-part buckling spring switching mechanism over a competitive PCB. The result is a light (60g) weighting clicky switch over a PCB with N-Key rollover. In addition to the more modern layout, the keyboard protocol works over set 2 (or ps2) which makes the keyboard easily usable on a modern computer with a passive set 2 to USB converter. For this reason, the model F AT is considered to be one of the most desirable models F keyboards, often fetching a higher price to the older and more common F XT.
The construction of the IBM F AT uses a metal bottom plate, a metal barrel plate, and a plastic top case. The result is a very well-built and sturdy keyboard with a distinct sound in comparison to other models F. The plastic top case of the model F AT, creates a more hollow-sounding ping in comparison to other models f, resulting in an overall deeper sound profile to the Model F XT which has an all-metal design. Unlike model M keyboards, each barrel is a detachable discrete unit made of plastic and can be removed from the barrel plate. In addition, the PCB of a model F AT has a few sensing pads that are unused. These two factors allow for the keyboard to be modded relatively easily to make an ANSI and Alt modded model F, which is a popular choice for keyboard enthusiasts.
The model F has a very unique ping that can be heard once a key is pressed. The almost “twang” of each spring buckling is a charming feature of the model F and is often difficult to pick up through a video demonstration. The ping of a model F is quite noticeable when in use, but less pronounced in the Model F AT, than other model F's because of the more hollow nature of the case. In addition, spring ping can be silenced through a reversible modification called the floss mod.
The switch feel of the Model F AT is often described as just right. The lighter weighting in comparison to the model M's membrane buckling springs, as well as the larger flipper size creates a very unique, smooth, and unbinding feel that is very tough to beat. The F AT uses wire stabilized keys for the modifiers and spacebar, which can be known to rattle. It is important to note that the pole-based stabilizers on model M will also work in model F AT.
All IBM model F AT keycaps are made from dye sublimed PBT and are of the one part variation. In the later years of keyboard production, IBM Produced 2 part keycaps in which the lettering was printed on a small hollow cap that can detach from the slider mechanism. As for which variation is better, it is up to debate, but the older “one part caps” are often described to have more sharp legends due to less-used tooling.
¶ Variants
N/A
¶ Gallery
¶ References
- The Free Dictionary - PC AT [accessed 2022-02-04]
- IBM - The first 10 years [accessed 2022-02-04]