HardLabs

TurboXT Addon

hkzlab·TurboXT_Addon

TurboXT Addon PCB layout, top view — open source board by hkzlab

About the TurboXT Addon PCB

TurboXT Addon is an open source PCB design by hkzlab, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 74.3 × 43.8 mm, with 28 components from 19 distinct parts.

Other key parts include the 8284, 74LS92, 74LS74, 74LS02 and 74LS00. By type, the board carries 9 capacitors, 7 connectors, 6 ICs, 4 resistors, 1 crystal and 1 switch.

It belongs with the retro computing designs in this gallery.

From the project

8Mhz Turbo / Reset addon board for the IBM 5160 (The original XT)

This board is originally based on schematics I found floating around on VCFED, and adds the following to an IBM XT:

- Switchable clock between standard (4.77Mhz) and turbo (8Mhz if the oscillator installed on the board is 24Mhz) - Auto disable of turbo-mode during DMA - Reset button header

I take NO responsibility for what happens if you decide to build and use this card. Your computer might crash, catch fire or be destroyed in other nasty ways. Also, as this card is mostly based on the work of others, You're encourauged to take what you deem fit from this, and use it in your projects!

TurboXT Addon, from the project README
From the project README

Main components on the TurboXT Addon

828474LS9274LS7474LS0274LS0074HCT14

TurboXT Addon bill of materials (BOM)

28 components, 19 distinct parts.

QtyPartRefs
1
8284
U1
1
74LS92
U2
1
74LS74
U3
1
74LS02
U4
1
74LS00
U5
1
74HCT14
U7
1
24Mhz
X1
1
8284 Socket
J1
1
HRQDMA
J2
1
DMAWAIT
J3
1
VCC
J4
1
GND
J5
1
Turbo LED
J6
1
Reset
J7
1
TURBO SWITCH
SW1
1
10uF
C1
8
100nF
C2, C3, C4, C5, C6, C7, C8, C9
3
10k
R1, R2, R4
1
470
R3

TurboXT Addon design files

The KiCad project lives in the hkzlab/TurboXT_Addon repository on GitHub; these links point at the commit this page was built from.

TurboXT Addon: common questions

How big is the TurboXT Addon PCB?

The TurboXT Addon measures 74.3 × 43.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TurboXT Addon?

28 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the TurboXT Addon design files?

From the hkzlab/TurboXT_Addon repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the TurboXT Addon design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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