Re: LZ: Extended mem. format
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> Active. I like this one better, because you could add a lot more to it.
> Basically, you take another microprocessor (Probably a Z80, since we
> already know how to program it) We could hook it up so that if your calc
> got reset, you could program the thingy to automatically send a backup
> to the calc if you did an input "cblget",blah or whatever on a cbl calc
> and go to link receive or whatever. This way there could be variable
> send/raw send/etc. The only problem is that i doubt if anyone has had
> any experience working with microprocessors and stuff (Me Included, i
> got the idea from my Z80 book). Wed at least need a microprocessor, rom
> code, actually, would probably be eeprom that would be locked by a
> special switch so that updates could be done without needing a burner.
> Wed also need either static ram or eeprom, or both maybe. We could leave
> the scematics open-ended (same with the rom code) so that if someone
> wanted to use eeprom for no-power storage, and static ram for fast
> access, although it would be through the link port, so it would be
> pretty slow. Anyway, i think the practically of this is limited by the
> fact that it would be to big and bulky.
>
you could do it with a micro-controller (~maybe 8051?) and i'd be a
lot less bulky..
> p.s. To anyone that knows the ram+rom of the ti-85, is any of it unused,
> i wonder how hard it would be to tap the bus (wed only need maybe 16k of
> address space plus a free port or two for a page switcher. The problem
> would be fitting all the crap in the case. oh well.
as far as I know, ther is no free address space, but I'm not surre if
there'es any free IO space... if only we could get soem technical
info on the Toshiba ASIC , but we've already tried and I can't get
anything out of Toshiba about it.. maybe we could get soemthing out
of TI about it????
Rob Taylor MAIL - mailto:rtaylor@ticalc.org
WEB - http://www.u-net.com/~rtaylor/
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