* - ZX97 ROM Image kann mann mit diesen Link  Downloaden. (Gezipped) 

** - Dieses IC wird verwendet für die Tastatur Matrix Eingabeport und für den 'EAR' Eingang. In einige Situationen ist es vieleicht empfehlenswert um ein LS IC zu verwenden weil diese einen andere Eingangsimpedanz haben, was sich positiv herauswirkt auf sowohl die maximal erlaubte Anschlußdrahtlänge, (wegen kapazitive Belastung/Kupplung von längere Anschlußdrahte) als auch das laden von Programe zB. von Bandaufnahmegeräte, PC Soundkarte usw. 

*** - These single line connectors and jumper headers can easily be made by cutting up precision IC sockets to fit the PCB positions. Similar sized pieces of precision IC sockets can be used as connectors for example for power, keyboard etc if you solder flatcable or other wiring in the IC holes. Make sure you insert the self-made connectors in a IC socket when you solder them or else the soldering heat may draw out the pins. 
From two loose precision IC socket pins you can easily make jumpers for example for the memory option or character/BG select options. Just insert two of them next to each other in a precision IC socket and solder them together using only soldering tin by holding the soldering iron between the pins while adding tin until they are merged. This should be relatively easy, at least that's my experience. 

**** - These resistor networks can easily be made by soldering precision IC sockets in their place since they are DIP devices. You can simply use 1K 1/4W resistors, bend the legs in a straight angle, cut the legs to length so they can be inserted into the DIP IC sockets. Try to keep the legs as long as possible while still inserting the resistors closely to the DIP sockets, thus getting maximum contact and mechanical stability. 
 
 

With questions I can be contacted by email

This homepage is best viewed with Netscape.               Last update 16-02-2000