ZX Spectrum Hardware Do it yourself
In early 80-es Sinclair launched for that time
very cheap microcomputers. It was result of simple construction
and usage of custom (ULA) chips. Most success he gained with
model Spectrum. There is still lot of them worldaround, many in
good condition.
Due to simple and opened architecture it's very applicable for
experimenting with diverse upgrades.
I think that even today it may be interesting, especially for
beginners and people who had earlier got Spectrums.
Following projects are all realized, and work
reliable for less-more long time. Most of them is made (and
tested) on 48K model, but they should also work on 128K models.
Projects
IDE hard disk interface
Scheme - note: here is Spectrum Edge connector layout.
Download ROM example (14KB)
Smart Media
card interface
UVY-RGB converter for 48K models
ROM switch
Flash EPROM instead ROM
Floppy interface
Scheme Note: Modified on 26. May '98 for compatibility with Spectrum 128.
ROM image with brief instructions & format program
External ROM modul
EPROM programmer
This is not for Spectrum - it's for PC (or other computer) with standard bi-directional parallel port.
Port addresses for interfaces and peripherals. Waste of bits. This is not list of port addresses by popular peripherals/interfaces. I try giving here some explanations of used systems, and how designing address decoders and using which addresses.
Following section is intended for authors of
Spectrum emulators. I included here only results of my
research:
Cassette/EAR/MIC port.
Issue 2 and 3.
Spectrum emulators for PC site - tests of various Spectrum emulators -NEW!
The World of ZX-Spectrum - most complete and best-maintained Spectrum related site on WEB.
Z80 CPU Official Support Page - many data about Z80.
http://www.repairfaq.org/~filipg/HTML/LINK/F_IDE-tech.html - IDE hardware reference. IDE hard disk commands.
ftp://ftp.nvg.unit.no/pub/spectrum/pics/circuit-diagrams/ - 48K scheme etc.
The ZX Spectrum Technical Information Repository - site with circuit diagrams of Spectrums.
http://www.expresspcb.com/ExpressPCBHtm/Resources.htm - here is free PCB design program for PC.
GAL related links:
ftp://ftp.armory.com:/pub/user/rstevew/GAL/ File GAL-ALGS.PGM contains very simple
programmer project, and infos about diverse GALs.
http://freepage.logicom.it/azummo/electronics/gal/gal.html .
http://www.alta-engineering.com/DOWNLOAD.HTM - RGBPLD21.ZIP , plus other digital electronic
projects.
Send me mail with questions, suggestions and comments about this site.
Issue4.jpg - 48K board in resolution of 1588x2549. File length is 800KB.
Spectrum
Webring site by Pera Putnik
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