8bit Projects For Everyone


Find   for  

ZX bus splitter

Board dedicated to 100×50×17 case (internal dimensions). Can be used with ZX Spectrum, Timex Computer 2068, Timex Sinclair 2068 and ZX81/TS1500. Unused contacts must be cuted out.

ZX.SPLIT board

Can be used in several configurations:

  • Two vertical boards with parallel tracks can be soldered - this gives three-ways bus splitter. Distance between vertical boards is 31.75mm (1.25").
  • Universal board can can be connected as parallel -- simple, through interface can be made (extra memory, AY, joystick, printer, DMA controller, faster Z80, slots like: cartridge, ISA, YABUS). Distance between signal rows connectors -- 35.6mm (1.4").
  • Can be cuted into 2 separate small boards -- this gives two double bus splitters or interface can be mounted vertically in a 100×17 case.

Version v004 contains in addition:

  • Place for 74LS139 SMD chip, that can be used to swith output signals (like /IORQ and /MREQ) to one of 3 edge connectors or to none of them.
  • Place for DIP-SWITCH to select active edge connector.
  • Place for 74LS153 SMD chip that can be used to switch input signals (like /INT, /NMI) from one of 3 edge connectors or from none of them.
  • Two places for microswitches, that can be connected to /RESET and /NMI. One is on the left, second on the right.
  • Place for DB9 connector. (A Kempston Joystick port can be mounted using reconfigured places for SMD chips - 74LS138 and 74LS368 should be used in that case.)
  • Places for LEDs.


Tell other people:

Files for download

0012b.jpg 76.9kB (2007-08-13 14:53)
ZX.SPLIT for ZX81 - extra 74HCT139 decodes A5=1 and A7=1 for ZX1541 due to port conflict with joystick (port 29). Bottom view.
0012t.jpg 69.7kB (2007-08-13 14:51)
ZX.SPLIT for ZX81 - extra 74HCT139 decodes A5=1 and A7=1 for ZX1541 due to port conflict with joystick (port 29). Top view.
0006tc.jpg 80.4kB (2007-04-25 18:25)
ZX.SPLIT used as three-ways bus splitter. Top case view.
0006bu.jpg 107.7kB (2007-04-25 18:25)
ZX.SPLIT used as three-ways bus splitter. Bottom uncased view. Only one slot gets /MREQ can generate /ROMCS=1.
0006bc.jpg 93.3kB (2007-04-25 18:25)
ZX.SPLIT used as three-ways bus splitter. Bottom case view.
0006tu.jpg 113.7kB (2007-04-25 18:26)
ZX.SPLIT used as three-ways bus splitter. Top uncased view. The DIP-Switch selects active slot.
0002a.jpg 144.3kB (2007-04-28 00:51), uploaded by Jarek Adamski
ZX.SPLIT as bottom board for ZX81 interface. Please note how the board is corrected with 16 jumpers.
spli-005.zip 53.5kB (2006-10-31 18:39)
Board v005, Eagle data files. This project has bugs, but 32 boards are producted. Needs some changes when used as bottom of universal interface.
spli-004.zip 57.5kB (2006-10-31 18:39)
Board v004, Eagle data files. This project is correct.
howtocut.jpg 140.2kB (2006-10-31 18:30)
How the ZX.SPLIT can be cuted for ZX81, ZX Spectrum and Timex 2068. Also halves used as Timex Twister and ZX+3 fixer. (Board v005.)
split003.png 8.9kB (2005-04-12 21:24)
Recent project board view.

Links to other pages

http://8bit.yarek.pl/forum/viewtopic.php?p=100
[pl] Request for comments on forum.



See also

YABUS.ZXISA
ISA slots for ZX Spectrum (I/O mapped). LPT, 2×RS232, Floppy Disk Controller and sound card.
ZX1541 : ZX81
Commodore 1541 disk interface for ZX81.

E-mail:

Password:



Forgot password?

Register?
Apple
HDD
Atari
IDE KMK/J¯
MyIDE
SIO2IDE
Commodore
IECATA
CPC
CPCISA
Hacker
PC
IDE
LPT
Sam Coupé
Atom
FDD
RTC
Samtrum
YABUS.SAM
YAMOD
ATBUS
AYLPT
EPROG
FDC765A
IDE8255
KJOY
ZXINPUT
Timex
BEU
Cartridge
FD-68
Larken
ZX81
ZX96
ZX1541
ZX Spectrum
AC-DOS
Interface 1
Interface 1 Bis
Interface 2
GeneralSound
Macface
MB-02
NMI
Packet Radio
PB-3
PL3MEM
Plus D
POLBASIC
Printer
Split
Timex M-397
CA80
YABUS.ZX
YABUS.ZXISA
YABUS.ZXMEM

If you see error on this page, describe here:

© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl