divMMC
divMMC SinDiKat edition – yet another divMMC clone with following features, improvements and changes
divMMC SinDiKat rev.4.1

- added voltage supervisor for more accurate RTC /CS signal handling during power on/off
- simplified battery connection
- it is still possible to disconnect the battery via the jumper on the top of the printed circuit board
- black pcb for cool design 🙂
Tested with the following computers:
- ZX Spectrum 48, Issue 3,4,6
- ZX Spectrum +, Issue 6
- ZX Spectrum +128K, Issue 6A, 9G
- ZX Spectrum +2
- ZX Spectrum +2A, +2B
- ZX Spectrum +3
- Harlequin 48
- Harlequin 128, Issue 2G
- Didaktik Gama 89, Kempston jumper disconnected
- Didaktik M 1992, depending on computer condition
We recommend performing a recap for all types of computers.
divMMC SinDiKat rev.3
- two micro SD card slots – on top and bottom side of PCB
- 512kiB RAM, 8kiB EEPROM
- RTC – real time clock chip Epson 72423, at port #03
- battery back-up RTC
- independent 4MHz clock generator
- powered from zx spectrum, current consumption 110mA
- kempston joystick interface
- old-school jumper configuration – +2A/+3 selection, Kempston disable and eeprom write disable
- fully supported by ESXDOS / fully supports ESXDOS
Support files for RTC
- RTC.SYS for ESXDOS
- Date/time settings utility MCLOCKEN.TAP by Busy.
- Works well also with esxdos 0.8.9



divMMC SinDiKat rev. 2
- features same as revision 3. specified above – without RTC chip
- cheaper than rev. 3
- ideal for players and occasional speccy users
