6 years ZX-TEAM
an overview of our most interesting projects
At first, here are the hardware-related articles. Please note, the very most articles are in German language. It would take us a lot of valuable time to translate it into English, which we could not spend for designing new projects!
So, please, could somebody help us? Send us email, if you are interested in any of the below and if you moreover could help us with translation. We are also working, to set the German articles on another Web-page, so there will be an access soon.
| Project title | date | short description |
| HRG adaptor | 1/91 | the simpliest circuit for HRG |
| POKE-card | 1/91 | detects a POKE 8,x instruction and latches the value |
| 32k RAM expansion | 1/91 | with battery backup, called the "WilliRAM" |
| Speech processor | 2/91 | uses SP256-AL2 processor |
| Sound processor | 2/91 | uses AY-3-8910 sound chip |
| POKE-card update | 2/91 | |
| EPROM-blaster | 3/91 | an EPROM Programmer for the ZX81 |
| Printer port | 3/91 | a comfortable Centronics interface |
| LOAD and SAVE | 1/92 | an improvement for better operation |
| Datalogger | 2/92 | A/D converter with CA3162 |
| Video Kit | 3/92 | output for use a Video monitor with the ZX81 |
| Stepper motors IF | 4+5/92 | very extended, for robotics controlling |
| ZX81 to ZX91 | 5/92 | project introduction |
| Stepper motors Part 3 | 1/93 | |
| Inverse Video | 1/93 | gives white letters on black background |
| Designing an "Ö" | 1/93 | how to change CHARs in the ROM |
| Stepper motors Part 4 | 2/93 | |
| One megabyte RAM! | 3/93 | an extension for up to 1MB additional memory |
| ROM adaptor | 3/93 | changing ROM with 16k-EPROM |
| Stepper motors Part 5 | 3/93 | |
| Check the AC adaptor | 3/93 | |
| Heartbeat monitor | 4/93 | indicating a running ZX81 with LED |
| Lowpower ZX81 | 4/93 | upgrading with internal accus |
| Large keyboard | 5/93 | |
| Power switch | 5/93 | switching up to 2 kW AC power |
| Byte grabber | 5/93 | displaying the whole bus state at defined breakpoints |
| Realtime clock | 6/93 | uses RTC58321 chip |
| Turbo indicator | 6/93 | indicating the FAST mode running with LED |
| ROM + WOM = RAM? | 1/94 | a write-only-memory |
| Colour module | 2/94 | yes, the ZX81 screen can be colored! |
| ZX80 drives telex | 4/94 | using a telex instead a printer |
| EPROM blaster scottish | 4+5/94 | a very cheap EPROM programmer up to 27128, fast programming mode |
| Addressdecoder | 5/94 | decoding the 2000h to 3FFFh area in 2k banks |
| DC-DC converter | 5/94 | step-up-converter for EPROM blaster up to 25 Volts |
| Mouse interface | 6/94 | connecting Atari mouses to ZX81 |
| Measuring temperature | 1/95 | a temperature sensor with HRG display |
| EPROM checker | 1/95 | checks 6654 (512 x 8) EPROMs |
| Z80 children | 1/95 | an overview about Z80 compatible processors |
| First success with LCD | 1/95 | a very long-time project, first successes |
| Window-opener | 2/95 | time-controlled opening and closing of windows |
| Repairing the ZX81 | 2/95 | hints for checking and repairing |
| LCD interface numeric | 2/95 | connecting small, alphanumeric LCDs to the ZX81 |
| LCD display Part 1 | 3/95 | THE interface for graphic-LCDs |
| CPC monitor connect | 3/95 | how to connect a CPC464 monitor to the ZX81 |
| Improved cooling | 3/95 | hints for a cooler ZX |
| Numeric LCD Part 2 | 3/95 | describes the 4bit-mode |
| LCD display Part 2 | 3/95 | this produced some errors, again the graphic-LCD-Interface |
| The ZX81 harddisk | 4/95 | IDE interface for the ZX81 |
| Repairing the ZX81 (2) | 5/95 | |
| EEPROM-ROM | 5/95 | changing the ROM with an EEPROM |
| EEPROM guide | 5/95 | many hints about handling EEPROMs |
| Digital resistor | 6/95 | a digital adjustable resistor, driven by a ZX81 |
| BCD to binary | 6/95 | converting BCD values to binary format with EPROM |
| Chipcard reader | 1/96 | displays the memory content of german telephonecards |
| NC-Accu manager | 1/96 | controlled charging / discharging with capacity measurement |
| AT-keyboard interface | 2/96 | a programmable keyboard IF, even with macros! |
| ZX80 component | 3/96 | the component side of the ZX80 PCB |
| AT-keyboard IF (2) | 4/96 | an improved macro handling and alternating keyboardlayouts |
| Super moving keybd. | 4/96 | an adaption |
| Videotracer | 4/96 | Repairtool |
| How to check a Zeddy | 4/96 | a guide for checking and inspection |
| FDC improvement | 5/96 | better reliability for the Floppy disc controller (uses WD1793) |
| Serial EEPROM | 5/96 | an introduction |
| LCD display Part 3 | 1/97 | the newest infos and connection diagrams |
| Rapairing the keybd. | 1/97 | useful hints for repairing the keyboard foil |
| Zeddy be cool | 2/97 | step-down DC-DC converter instead the 7805 |
| Handling of GALs | 3/97 | a beginners course about GAL |
| The FPGA project | 3/97 | thoughts about the use of a FPGA instead the ULA |
| RAM-IC checker | 3/97 | a cheap checker for most-used RAMs (2k, 8k, 32k) |
| Megabyte-card | 3/97 | the new revision, upgraded for the ZX96 needs |
| LOAD and SAVE help | 4/97 | box with speaker and micro for comfortable LOAD and SAVE |
| quarter megabyte-card | 4/97 | use 32k x 8 chips instead the 128k x 8 on the megabytecard |
| Cache RAM | 4/97 | plug DIL cache RAMs in an usual socket |
| Handling of GALs (2) | 4/97 | |
| ZX81-GIANT | 4/97 | 144kB of various memory |
Kai Fischer or Peter Liebert-Adelt
last updated Aug/98
