DATA-GEAR is DMA interface for 8-bit computers with Z80CPU. Original schematic is DMA part of interface MB02+. DATA-GEAR is connected to socket for Z80CPU, there's no need any hardware modifications in your computer.  DMA chip use dirrect access to memory or port. Transfer of linear data block (max. 64kB) memory to memory / memory to port / port to memory / port to port. For computers with max. CPU speed 4MHz is used Z80DMA chip, but for faster computers (SAM COUPE=6MHz, ZS SCORPION TURBO=7MHz ...) is need use DMA chip at 6-8MHz. DMA chip is programmed via port 11(#0B) = MB02 compatible. On board is jumper JP1 for change programming port to 107(#6B).  If JP1 is connect, then port 107(#6B) is used.

Max. speed of data transfer on ZX128+ is 17.3 kB(17727 bytes) / frame = 865.6 kB(886350 bytes) / second


DATA-GEAR  -  DOWNLOAD
 PCB + Schematic for Eagle
GAL equations + JEDec
INFO ABOUT DMA
DMA - info
Czech scripts(page 225-243)
Z80 peripherals(page 77-94)
DMA - CP/M
VIDEO EXAMPLES
Example of DMA transfer

 

DMA - DEMOS ( info about DMA demos 1-3)

DMA DEMO LEVEL 1 by Busysoft ( .AVI )

DMA DEMO LEVEL 2 by Busysoft ( .AVI )

DMA DEMO LEVEL 3 by Busysoft

D N A  DEMO by Omega ( .AVI )
NaPICU DEMO by DRON of K3L
 

 

DMA - GAMES

ELITE by Omega

INTER. KARATE A by Omega

INTER. KARATE B by Omega

VISITORS by Omega
GHOSTBUSTERS 128 by Omega
 

 

GREYSCALE MULTITECH GRAPHICS (more info)
FULLSCREEN MULTICOLOR PICTURES ON MONOCHTOMATIC MONITOR
MB02 / DATA-GEAR / TIMEX / PENTAGON

COLOR MULTITECH GRAPHICS
FULLSCREEN MULTICOLOR PICTURES by Omega

DOWNLOAD
GRAPHICS
MULTITECH SCREEN VIEWER + GREYSCALE PICTURES 1

MULTITECH SCREEN VIEWER + GREYSCALE PICTURES 2
MULTITECH SCREEN VIEWER + COLOR PICTURES
MULTITECH SCREEN VIEWER - SOURCE CODE
MULTITECH DMA EFFECTS (from DNA demo by Omega) - SOURCE CODE

MULTITECH SCREEN VIEWER for TIMEX / PENTAGON without DMA + GREYSCALE PICTURES 1
MULTITECH SCREEN VIEWER for TIMEX / PENTAGON without DMA + GREYSCALE PICTURES 2
MULTITECH SCREEN VIEWER for TIMEX / PENTAGON without DMA + COLOR PICTURES
MULTITECH SCREEN VIEWER for TIMEX / PENTAGON without DMA - SOURCE CODE


GRAPHIC CONVERTORS
ZXS MULTITECH CONVERTOR for PC    ( link to original 8BC webpage )
BMP2SCR EXP 2.11a
BMP2SCR EXP 2.10b
BMP2SCR PRO 2.01
BMP2SCR 1.751
BMP2SCR v1.75
BMP2SCR v1.74
BMP2SCR v1.73
BMP2SCR v1.70
BMP2SCR v1.62
BMP2SCR_INSTR
BMP2SCR PRO 2.00c INSTR
RETRO X - alpha 5

 

DMA - UTILITIES
EASY HDD 1.05 (for DataGear)
EASY HDD for DIVIDE IDE ports + DATA-GEAR
 


 


 

New schematic (Velesoft 2007)

New DATA-GEAR interface (Velesoft 2007)



 

Original schematic (8BC Company)

Z80 DMA - PINOUT

.       8410, Z8410, Z80DMA
.   Z80 DMA controller - PINOUT
.
.         +-----+  +-----+
.      A5 |1    +--+   40| A6
.      A4 |2           39| A7
.      A3 |3           38| IEI
.      A2 |4           37| /INT /PULSE
.      A1 |5           36| IEO
.      A0 |6           35| D0
.     CLK |7           34| D1
.     /WR |8           33| D2
.     /RD |9           32| D3
.   /IORQ |10   Z8410  31| D4
.     VCC |11    DMA   30| GND
.   /MREQ |12          29| D5
.    /BAO |13          28| D6
.    /BAI |14          27| D7
.  /BUSRQ |15          26| /M1
./CE/WAIT |16          25| RDY
.     A15 |17          24| A8
.     A14 |18          23| A9
.     A13 |19          22| A10
.     A12 |20          21| A11
.         +--------------+

 


LIST OF Z80DMA MANUFACTURERS

ZILOG:
  (tested with Data-Gear)
- Z841004 = 4MHz
- Z84C1006 = 6MHz - 6 MHz version - ideal for SAM COUPE or ZX
- Z84C1008 = 8MHz - faster type of DMA, ideal for fast Russian ZX clones with Z80CPU at 7MHz (too for SAM or ZX)

RFT:
  (tested with Data-Gear)
- UA858D = 4MHz - German DMA clone used in MB02+ interface

MOSTEK:
  (tested with Data-Gear)

- MK3883N4 = 4MHz
- MK3883N = 2.5MHz - tested on ZX, work correct on 3.58 MHz

ST:  (tested with Data-Gear)
- Z8410AB1 (4MHz)

TOSHIBA:

- TMPZ84C10AP-6 = 6MHz

SHARP:
- LH0083A - Japan Z80DMA clone (4MHz ?)

SGS:
- Z8410AB1 - Italian Z80DMA clone (4MHz ?)


 

MOSTEK(2.5 MHz) and UA858D(4MHz)

SHARP(4MHz) and TOSHIBA(6MHz)

SGS
ST(4MHz)


EXAMPLE OF DMA MULTICOLOR IN BORDER AREA
(transfer mode 2T read data from memory + 2T write data to port #FE)