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system-99 user-group (snug)

Contacts: Harold Becker in Mannheim and Harald Glaab in Aschaffenburg, both Germany.

Produced hardware (with supporting firmware) for the TI99/4a community.

"The products offered are created exclusively in their free time by our Club members and assembled at home and offered at cost.. Because of minimum parts orders, we offer these cards to our members first as needed and any surplus cards are offered to non-members and other users-groups without profit at cost."

Products include:


Advanced SCSI Card. Produced 1997, Listed as sold out.

  • Compatible with the WHTECH SCSI-Controller
  • Up to 7 SCSI-drives is supported, with the actual DSR with a capacity of up to 248MB per drive
  • Other SCSI devices (CD-Rom, Streamer ...) are supported but the actual DSRs are not available.
  • High speeds through P-DMA
  • Easy update of the DSR through FLASH-EPROMS
  • Usable with the original Console or SGCPU


-Diskcontroller. Produced 1990. No longer available due to lack of chipset but second hand may be available.

  • Diskette Controller with Double-sided, Double-density capability
  • Supports up to four disk drives
  • Step rate is selectable
  • On-board clock software is compatible with the Triple Tech Card from CorComp.
  • Time stamp for each file in the FDS.
  • Display of the date and time on the Titlescreen
  • Emulation of the offered DSDD-Formats from Texas Instruments (16 Sectors per track)
  • Usable with the original Console or SGCPU


  • Enhanced Video Processor Card and release 2.
  • Commenced 1995, release two was still listed for sale in 2014.
  • Compatible with the Mechatronic 80-column card
  • Video processor v9938 or v9958 used
  • Simple update of the DSR through Flash-technology
  • Supports all of the graphics modes of the TI99/4A
  • Textmode is 24*80 columns
  • The different graphics modes are 512 * 424 pixels and up to 256 colors and 8 sprites.
  • Mouse support (not with the use of the V9958)
  • No external Interrupt cables necessary when use (REPL99x) in the original Console.
  • Usable with the original Console or SGCPU

HRD 16

High-Speed RAMdisk, produced 1998, listed as sold out.

  • Software compatible with the Horizon 4000 (tm) Ramdiskseries.
  • Expandable up to 3 Megabytes (which is more than 9 Ramdisks of 1440 Sectors)
  • In combination with the SGCPU transfer speed is doubled through the 16-bit Bus
  • DSR can be also placed in Eproms (not possible with actual Horizon ROS)
  • Backup power is through a Lithium battery (min. 5 years)
  • Better file security through a new method of reset switching.
  • Usable with the original Console or SGCPU


GROM / GRAM - Card with (up to) 18 module pages. Produced 1995, listed as sold out.

  • Up to 16 Modules in ROM and 2 Modules in RAM in the Peripheral Expansion Box.
  • Programming the Modules and DSR without removing the Card through Flash-EEPROMS
  • All of the storage area from Grom0 to Grom7 and Rom6000 is on the Card, no original-ROM necessary.
  • 4-time ROM -banking for every existing GROM-Base.
  • No switches needed – Switching from Module to Module is by means of REVIEW MODULE LIBRARY(tm) or through the altered GROM 0 from Winfried Winkler.
  • Usable with the original Console or SGCPU
  • Requirements: 32K Memory and disk system.


Second Generation CPU Card. Produced 1996, listed as sold out.

  • Displaces the Console into the Peripheral Expansion Box
  • Keyboard inferface for MF2-keyboards (AT) with hardware reset and load interrupt
  • Joystick and original keyboard over an adapter supported
  • Optional cassette interface planned.
  • Memory expansion of 32 KBytes onboard.
  • Super-AMS up to 1024 KB is possible
  • All of the memory expansion is on a 16-bit Bus.
  • Support for further 16-bit peripherals is planned.
  • Optional: Support for single-step mode in the TI-Debugger,
  • load-interrupt is synchronized (only 1 pulse)
  • HSGPL and EVPC(2) must be used with the SGCPU as TI99/a is absolutely necessary!


Speech and Voice Memory Card. Produced 1999. Still listed for sale.

  • Standalone replacement for the Speech Synthesizer.

As many as 8 Speech ROMs of 64 Kilobytes each through emulation in Flash-Roms is possible. Switching is through DSR commands.

  • Complete Speech emulation in English from the Terminal Emulator II in DSR has been implemented (Winfried Winkler).
  • Easy update of the DSR and voice memory through FLASH-EPROMS.
  • Usable with the original Console or SGCPU