838 Designs
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Simply connect the Drive side to the current 3.5 floppy drive and the other side to your controller via a standard straight through floppy drive ribbon cable (34 pin cable). Then it is as simple as choosing what drive number to be assigned with the dip switch.
All boards tested before shipping.
Board color may change and component colors may change depending on stock.
****Floppy disk drive NOT included!****
****Floppy disk drive cable NOT included!****
After purchase email .PNG file along with text that is required to be on coaster to: click to email requirements
Introducing a new vintage charm for your desk ensemble – the Custom Engraved Slate Drink Coaster. Crafted with meticulous attention to detail, this coaster seamlessly merges retro aesthetics with practical functionality, serving as the perfect companion to your cherished retro computers.
Each coaster is meticulously handcrafted from high-quality slate, chosen for its durability and timeless elegance. The smooth surface of the slate provides the ideal canvas for customization, allowing you to imprint your chosen design with precision and clarity.
The retro flair comes to life with the engraved design meticulously etched into the slate surface. Imagine intricate patterns reminiscent of classic computer circuitry, or perhaps the iconic logos of vintage tech brands that evoke nostalgia with every glance. Whether it's a pixelated rendition of your favorite retro game character or a homage to classic computing icons, the engraving is tailored to your unique preferences, adding a personal touch to your workspace.
Not only does this coaster serve as a stylish accent piece, but it also fulfills its primary function with excellence. The natural properties of slate ensure that your desk remains protected from unsightly water rings and spills, while also providing a stable base for your beverage of choice.
Adding the Custom Engraved Slate Drink Coaster to your desk is more than just a practical decision; it's a statement of your appreciation for the timeless allure of retro technology. Let it be a conversation starter, a nod to the bygone era of computing innovation, and a reminder of the enduring charm of the classics. Enhance your workspace with this exquisite coaster and elevate your retro computing experience to new heights.
Once out of stock, no more will be ordered.
Introducing the 838-SCSI Limited Edition White card for your TI-99/4A and Myarc Geneve 9640 computers. One of the best storage solutions brought back to life for 2024.
All limited editions come stock with machine sockets and GOLD contacts.
This expansion card has been in the works for quite some time and is now being offered to the community. The once hard to get WHTSCSI card has been reworked to remove unused circuitry and correct some board errors. This board is completely compatible with the original WHTSCSI Revision F expansion card.
Changes/Additions:
1> Removed one of the 50 pin IDC header connectors
2> A DB25 connector has been added to help allow for a more stable data transfer for IO and to address new devices that are using the industry standard DB25 connector such as the ZuluSCSI device.
3> Added a USB port for 5v power to power devices like SCS2SD or ZuluSCSI.
This card has been tested extensively with the TI-99/4A and Myarc Geneve 9640 computers. The card has been tested to function with original spindle SCSI drives, EZ135 cartridge drives, SCSI2SD devices as well as the new ZuluSCSI device.
This is a limited production run that is fully assembled and tested 838-SCSI board Limited (White board with Gold contacts and machined sockets) - There are only a handful of these and no more will be produced.
No bare PCBs or DIY kits will be sold due to previous user errors.
What you will need for your board. If using a DB25 connection you will need a DB25 male to male cable straight through, every wire needs to be connected 1-1, 2-2, etc.
Orders will be filled by first in first out.
Boards and components will be ordered on May, 22, 2024. Orders will be filled based on first in first out.
Introducing the 838-SCSI card for your TI-99/4A and Myarc Geneve 9640 computers. One of the best storage solutions brought back to life for 2024.
This expansion card has been in the works for quite some time and is now being offered to the community. The once hard to get WHTSCSI card has been reworked to remove unused circuitry and correct some board errors. This board is completely compatible with the original WHTSCSI Revision F expansion card.
Changes/Additions:
1> Removed one of the 50 pin IDC header connectors
2> A DB25 connector has been added to help allow for a more stable data transfer for IO and to address new devices that are using the industry standard DB25 connector such as the ZuluSCSI device.
3> Added a USB port for 5v power to power devices like SCS2SD or ZuluSCSI.
This card has been tested extensively with the TI-99/4A and Myarc Geneve 9640 computers. The card has been tested to function with original spindle SCSI drives, EZ135 cartridge drives, SCSI2SD devices as well as the new ZuluSCSI device.
There will be a few options to choose from so please read the below:
Option #1: Fully assembled and tested 838-SCSI Board (Blue board with standard HASL contacts)
Option #2: Full Assembled and tested 838-SCSI Board (Blue board with standard HASL contacts) but without the SCSI Controller IC, you must source that yourself or have one already to plug on the board.
There is a limited option that is fully assembled and tested 838-SCSI board Limited (White board with Gold contacts and machined sockets) - There will only be a handful of these on the site to be purchased.
838-SCSI Limited Edition (shift838.com)
Users can choose between 'dual wipe' and 'machined' sockets for options 1 and 2.
No bare PCBs or DIY kits will be sold due to previous user errors.
What you will need for your board. If using a DB25 connection you will need a DB25 male to male cable straight through, every wire needs to be connected 1-1, 2-2, etc.
Product Description
Introducing the new 838-SPEECH v1 PEB Adapter card for use with the TI-99/4A and Myarc Geneve 9640 computers.This card allows a user to remove the TI Speech Synthesizer (not included) from the original enclosure and plug it on top of the PEB board to reclaim desk real estate!
Place the card into the PEB (not included) in any slot after it has been powered off for at least 2 minutes.
Your PEB will now talk!
There are 2 different options for IC sockets for building:
- DIP Sockets (Dual-Wipe sockets - These are spring pressure and can fail, but typically I have only seen one fail if IC's are inserted and removed frequently.
- Machined Sockets - Besides these looking nicer in my opinion they have less of a chance of failure. These sockets have machined rounded pins and fit nice and snug with the IC legs. There is an additional cost to use instead as they are more expensive.
To see a video of the card working then go to my YouTube channel link below:
See Video Here
Please note all items are shipped with insurance.
PDF Manual is HERE
Introducing the 838-IDE V3.0 hard disk controller for the TI-99/4A and Geneve 9640 computers.
Please allow one week for build and testing.
Original concept by Thierry Nouspikel (2005).
Introduction and demonstration video: CLICK HERE
IDE V3 Manual: CLICK HERE
This IDE version has been converted to a 100% through-hole component design. Designed to be used with the 838-RTC module or an original BQ4847 RTC.
Features:
- Support for 2 physical IDE devices (Primary and Slave)
- Each device can have 4 partitions of 260mb each.
- Support for standard 40-pin IDE connector
- Support for Standard 44-pin IDE connector
- 44-pin has power and ground already wired into the connector.
- 5v power and Ground via (This can be used to power a IDE2CF Card or IDE2SD Card)
- 2-pin header
- 4-pin 3.5 type Molex connector
- DC/DC 5v converter replaced standard LM7805 voltage regulator
- This upgrade allows the card to run substantially cooler, an average of 40-50 degrees Fahrenheit cooler than the standard 1.5amp LM7805 with heatsink.
- Can use an existing 5v 838-RTC Module or original BQ4847 RTC.
Packages:
- Assembled and Tested - includes a complete board assembled and tested (buyer must choose IC socket type and clock module type during the purchase process).
- Standard Dual-Wipe (which are spring or pressure type sockets for IC's)
- Machined Round Sockets
Real Time Clocks available (if in stock will display in options):
- 838-RTC Module IF AVAILABLE (Includes an assembled/tested 838-RTC with CR2032 installed)
- Original BQ4847 (IF AVAILABLE) by Texas Instruments or other manufacturers - Internal battery has passed voltage test.
- Single CF Card Adapter currently, plugs directly into the 40-pin IDE connector, does require power to be supplied by a Molex power cable (purchased as an option) or a standard 2 pin jumper wires. This adapter will give IDE1-4 with each partition being 260mb.
- Dual CF Card Adapter. This adapter plugs directly into the 40 pin IDE connector, requires power supply by the Molex power cable (purchased as an option) or a standard 2 pin jumper wires. This adapter will give IDE1-4 on the Primary CF Card and IDE5-8 on the Slave CF Card, each partition being 260mb.
- Female to Female 4-pin Molex (only 5v and Ground is connected) - This power cable will connect directly to a device that supports a 3.5 standard type of Molex connector. Note - this power only supports 5v and is perfect for the CF Card adapter or SD Card Adapter.
This option is just to let me know what to configure the card for before shipping.
Pictured with option 32k memory module (NOT INCLUDED)
This replacement removes the firehose type cable and elephant foot connector that plugs into the 99/4A console side port with a vertical standing interface utilizing a DB37 twisted paired cable that plugs in from the back to reduce desk real estate.
Allows for expansion within the side port connector with an optional 32k expansion card to free up an extra slot on the PEB. Additional expansion cards are currently in design mode.
The 838-IO Plus board is being offered in 3 different packages:
- Bare Boards only (you source the parts)
- DIY KIT (Bare Boards components - you build it)
- Assembled/Tested - assembled and tested before being shipped
Demonstration Video: https://youtu.be/g6bb5DK2shI
Another video from a fellow TI enthusiast of the delivered card:
SHIFT838 Peripheral Expansion Interface (For the TI-99/4A) - YouTube
838-IO Plus Manual: http://www.shift838.com/support/838-IOP_manual.pdf
All cards will be built and tested before being shipped on the below TI-99/4A test system:
- TI-99/4A
- 32K CARD
- FDC
- TIPI
- 838-Speech
- 3D cases are not included but can be added to order. Please allow an extra day to print
- Cable NOT included, must be ordered from (iec.net) as I no longer make the cable. These can be ordered in 3, 4 and 5 foot lengths. You can call them to order at (303)288-5000 and give them one of the below part numbers below:
- L1177-03 (3 FOOT)
- L1177-04 (4 FOOT)
- L1177-05 (5 FOOT)
- 32K expansion module NOT included must be added as option.
I have verified cables will work with 3, 4, 4.5 and 5 foot lengths in a twisted pair configuration.
Cabled used: 50 conductor, twisted pair, dual shielding. I use the below link to the cable i purchase to make these:
28 Gauge 25 Pair Double Shield SCSI Cable - IEC
You can order the cable from IEC, you will need to call them at 1-303-288-5000
The part numbers for the cables are:
- L1177-03 (3 Foot Cable)
- L1177-04 (4 Foot Cable)
- L1177-05 (5 Foot Cable)
User Manual with Wiring Diagram:
http://www.shift838.com/support/838-IOP_manual.pdf
Standard off the shelf molded DB37 cables will not work!
If you want to print your own 3D case the two that have been designed are in the linked file below at https://www.shift838.com/downloads/838IOPCASES.zip
This is a blank/bare PCB (unpopulated)
Used for easy prototyping for new cartridges for the TI-99/4a home computer.
Introducing the SHIFT838 99/22 USB Keyboard Adapter: Unlock Modern Convenience for Your Classic System
Please allow 3 business days for build and testing before shipping.
Are you a proud owner of the new 99/22 TI-99/4A clone computer? Love the nostalgia but wish you could type on a more familiar keyboard? Look no further! The SHIFT838 99/22 USB Keyboard Adapter bridges the gap between retro computing and modern convenience.
Key Features:
Plug-and-Play Compatibility:
- Simply connect your favorite standard PC USB keyboard to the SHIFT838 adapter.
- No drivers, no fuss—just seamless compatibility.
- Connect the standard 99/22 Keyboard at the same time using the keyboard expansion header on the SHIFT838 99/22 USB Keyboard Adapter. Just use standard dupont female to female jumper wires (not included).
Compact Form Factor:
- Designed with your 99/22 in mind, the USB adapter sits directly over the mainboard by plugging directly into your vertical keyboard header.
- No bulky add-ons or messy cables—just a sleek, unobtrusive solution.
Full-Size Keyboard Experience:
- Say goodbye to those tiny, rubbery keys. With the SHIFT838 99/22 USB Keyboard Adapter, you get the full tactile experience of a standard PC keyboard.
- Type faster, type better, and relive the golden age of computing.
Built to Last:
- Crafted with quality components, the SHIFT838 99/22 USB Keyboard Adapter is robust and reliable.
- It’s a one-time investment that enhances your 99/22 experience for years to come.
Compatibility:
- No need to sacrifice functionality—type comfortably and efficiently.
Upgrade Your 99/22 Today:
- Whether you’re coding, gaming, or just reminiscing, the SHIFT838 99/22 USB Keyboard Adapter brings modern ease to your vintage setup.
- Rediscover the joy of typing on a familiar keyboard without compromising the essence of your beloved system.
Introducing the SHIFT838 GROM Extender, a must-have accessory for the 99/22. This product will also work the TI-99/4 and TI-99/4A home computers. This product is a blank printed circuit board (PCB) designed to extend the cartridge port for your 99/22 setup.
This product addresses the issue in the current 99/22 v0.96 board of the cartridge not plugging in all the way when U18 is socketed.
Buyer will need to source their own card edge connector for use. Suggest the straddle connector made by Sullins connectors.
Introducing the 838 99/22 IO Port Extender, a must-have accessory for the 99/22.
This PCB will plug into the internal IO Port header (J12 on V0.96 PCB) and produce an edge card connector allowing side port IO peripherals like a TI Speech Synthesizer, side port TIPI/32k Combo card or any other side port peripheral device to plug directly into this header.
This PCB will lift the device with enough clearance to hang over the ICs on the 99/22 mainboard. Allowing for less devices to be plugged into the external IO Port edge connector. The extended raised female header has gold contacts as well to ensure the best connection.
Only sold assembled.
See photos of the board installed in my personal 99/22.
Introducing the 838 Unicorn PCB, a must-have accessory for the 99/22. This is the GROM simulator PCB that has been redesigned to a smaller footprint and allows the board to be directly plugged into the Unicorn port (header J4) vertically. This new design allows for the 838-Unicorn board to sit directly over the 99/22 mainboard. This board gives no added functionality from the original, it is just a design change.
This is only the blank PCB; options can be added when adding to cart.
Please be aware if choosing to assemble you will need the board programmed with one of the GROM loads offered. If anything, other than Standard TI GROMs is programmed to the Unicorn then the 99/22 will require the additional EPROM that can be added to the package, or you can program one yourself.
If you want to run extended basic from the onboard cartridge EPROM then the GROMS required with be the Extended Basic version you want. The EPROM must match the GROMs loaded, or it will not work.
Please select appropriately.
TI-99/4A Console Tester originally designed by Geoff Trott is back and ready for a pre-purchase.
This is for the PROTOTYPE board. There is only one error on the board, and it is a value of a capacitor, no trace errors.
The TI-99/4A Console Tester is a game-changer for anyone with a TI-99/4A system. Designed to plug into the side of your console, this handy unit runs an isolated diagnostic program stored on an EPROM, streamlining the process of identifying and fixing faults in your TI-99/4A.
With its comprehensive testing capabilities, this console tester can diagnose issues with key components including RAM, ROMs, GROMs, and the VDP, among other vital parts. Say goodbye to the frustration of spending countless hours diagnosing a failed console—the TI-99/4A Console Tester saves you time and effort by providing precise diagnostics quickly and efficiently.
Make console troubleshooting a breeze with the TI-99/4A Console Tester and get back to enjoying your classic games and computing in no time!
Download the manual HERE
TI-99/4A Console Tester originally designed by Geoff Trott is back and ready for a pre-purchase.
This pre-order will be online until 11/24/2024 12:00 (NOON) CST.
Components and PCBs will not be ordered until after the pre-order closes.
Note: Picture shown is of the prototype board. You will not get the prototype.
The TI-99/4A Console Tester is a game-changer for anyone with a TI-99/4A system. Designed to plug into the side of your console, this handy unit runs an isolated diagnostic program stored on an EPROM, streamlining the process of identifying and fixing faults in your TI-99/4A.
With its comprehensive testing capabilities, this console tester can diagnose issues with key components including RAM, ROMs, GROMs, and the VDP, among other vital parts. Say goodbye to the frustration of spending countless hours diagnosing a failed console—the TI-99/4A Console Tester saves you time and effort by providing precise diagnostics quickly and efficiently.
Make console troubleshooting a breeze with the TI-99/4A Console Tester and get back to enjoying your classic games and computing in no time!
Download the manual HERE
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