838-PEB V1.0


Product Details

: 838-PEBV1
: 0
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Product Description

This is a PRE-ORDER!

*** This pre-order does NOT include shipping.  You will be contacted to pay for shipping before your order goes out. ***

Preorder will close on July 25, 2022 at 12:00 p.m. CST.  Once closed the item will be flagged as 'OUT OF STOCK' and no new orders will be taken until the pre-orders have been filled.

Introducing the new 838-PEB designed for the TI-99/4A and Myarc Geneve 9640 computers.

The 838-PEB replaces the aging Texas Instruments PEB and allows the user to buy their own PC case and ATX power supply based on their personal needs.

The 838-PEB has a standard ATX board footprint, so any PC case that will accept a ATX mainboard will work! It also accepts the standard 24 pin ATX PC power supply!

  • 8 Expansion Ports
  • Designed for use with the 838-IO Plus card
  • ATX Form Factor
  • ATX 24 Pin Power supply compatible
  • Multiple power taps for 3.3v, 5v and 12v
  • USB 3.0 Front ports can be used for power and use with micro-gotek!
  • RJ45 jacks for support for Gotek 1 and Gotek 2 drives for use with external display and rotary modifications.
  • Geneve 9640 Reset options for using the PC Case reset switch
    • Use at your own risk, not responsible if you blow your Geneve up.
  • 6 ports for 12v PC fans (3 pin)
  • USB Pass through power to power a device that always needs to be on.  Such as a Raspberry Pi for use with the TiPi (Power is not supplied from ATX PS)
If you already have a 838-IO Plus card and cable, please note I am not certifying this to work with any cable longer than 4 feet due to the extra pigtail that is required to connect the 838-IOP to the 838-PEB board as well as the added trace lengths between the two on the board.  4 feet is max.  If you have a longer cable it will need to be reduced or you can order a new one.

If purchasing a assembled and tested board then all boards will be tested with a 450w ATX Power supply and with the below peripheral expansion cards:

- Myarc FDC
- TI 32k Memory Expansion Card
- 838-Speech
- TiPi

Please watch the options when ordering.  Choose the right one for yourself.

The 838-PEB does NOT come with the 838-IOP Plus card.  If you have one then you are good otherwise you will need to order one.  The 838-32k Module is for the 838-IO Plus card as it plugs directly inside it. 

Please be aware that standard PC cases that use the ATX power supply use a momentary power switch instead of a lathcing.  This switch will not keep the power supply engaged without a lathcing circuit.  Standared PC motherboards have a built in circuit to force latching behavior.

You will need to do one of the following:

- Purchase or design a momentary to latching Circuit that will hook up to the breakout pins provided on the 838-PEB board
- Swap out the current switch with a latching switch of the same size
- Mount a new latching switch at the appropriate location that you decide and hook it up to the headers on the 838-PEB board.

If you choose to replace the current momentary switch with a latching version then most PC cases will need a micro push button switch that is a 6 pin DIP DPDT self-locking Power On/Off that measures 8mm x 8mm.  Please verify your size first, but this is the size that I have found in all of my cases that I have examined.

If you have any questions then contact me before ordering at shift838sup@gmail.com

To read all about this project from concept to reality go to:

To see a demonstration video of the 838-PEB then go to:
838-PEB Version 1.0 Introduction Demonstration - YouTube
$80.00 inc. tax
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