Re: Vortex schematics and old holtek chips

[jim palmer <jimp@pobox.com>]

> 
> HI Folks,
>                 Good to be back on this list after a long absence (what 
>*was* I
> thinking! ).
> I own a vortex and a while back I tried fitting in 256k DRAMS and made 
>some
> good guesses at what to put in U10... Good news is my vortex is still 
>working,
> bad news... no increased delay time :-( Maybe I guessed wrong on U10, 
>maybe
> I need to go find me a DSP hacker. 

won't you need to change the program (eprom?) to address new ram?

>... 
> On another line, does anyone know of a supplier of the (sadly obsolete) 
>holtek
> HT8955A chip? radioshack used to sell it, it's a digital delay that 
>really just
> needs
> a dram chip and a couple of op-amps bolting on to it to go up to 800ms 
>and I
>  fancy stringing about 16 of them together with feedback paths 
>everywhere to
> make a nasty monster noisemaker thingy .... :-)
> 
> Cheers,
>            Robin.
> 

that sounds like a lot of fun.
you might want to trademark that name
(nasty monster noisemaker thingy)