ZX-40 Development Board?
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DH*
ZX-40 Development Board?
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Last edited by DH* on 08 June 2006, 12:47 PM, edited 2 times in total.
Very neat. A schematic would also be useful unless it is proprietary. The angled jumper J2-A is interesting.
I'm sorry to dash your hopes but support for program memory over 64K is probably hard to do because the architecture is built around 2 byte addresses. I guess some kind of paging system could be used to flip to the upper half of the EEPROM but why bother? Most ZBasic programs only use a fraction of the 32K standard EEPROM and I really cannot see anyone using more than 64K unless they have huge amounts of static array data or string data that is loaded from the EEPROM.
I'm sorry to dash your hopes but support for program memory over 64K is probably hard to do because the architecture is built around 2 byte addresses. I guess some kind of paging system could be used to flip to the upper half of the EEPROM but why bother? Most ZBasic programs only use a fraction of the 32K standard EEPROM and I really cannot see anyone using more than 64K unless they have huge amounts of static array data or string data that is loaded from the EEPROM.
Mike Perks
I am familar with some of the history around the BX-24AHT project. The URL you gave doesn't work.
Yes the AT25HP512 is very expensive. It is a little cheaper in the SOIC-16 packaging. I haven't seen the 25LC1024 before so thanks for pointing that out.
For paired jumpers like J2-A/J2-B I have used a miniature DPDT slide switch to ensure both are changed at the same time.
Yes the AT25HP512 is very expensive. It is a little cheaper in the SOIC-16 packaging. I haven't seen the 25LC1024 before so thanks for pointing that out.
For paired jumpers like J2-A/J2-B I have used a miniature DPDT slide switch to ensure both are changed at the same time.
Mike Perks