Sinclair ZX80 / ZX81 Forums

by **siggi** on Wed Mar 03, 2010 11:19 am

I would be happy the hear my Zeddy talking to me. But AFAIK the speech processor chip used (SPO256) is no more available nowadays

Siggi

by **Moggy** on Wed Mar 03, 2010 12:18 pm

siggi wrote:I would be happy the hear my Zeddy talking to me. But AFAIK the speech processor chip used (SPO256) is no more available nowadays

Siggi

SPO256 available here last item on page.

http://www.sciencestore.co.uk/acatalog/ ... 4wodCi_meQ

by **siggi** on Wed Mar 03, 2010 4:18 pm

Moggy wrote:SPO256 available here last item on page.

http://www.sciencestore.co.uk/acatalog/ ... 4wodCi_meQ

Thanks!

Siggi

by **sirmorris** on Thu Mar 04, 2010 9:13 am

An AY board with on-board amp, with a socket for the SPO256?

I've bought one too

by **siggi** on Thu Mar 04, 2010 9:20 am

sirmorris wrote:An AY board with on-board amp, with a socket for the SPO256?

Perhaps a connector for external active speakers would be enough?

Siggi

by **sirmorris** on Thu Mar 04, 2010 9:38 am

I was thinking something more like:

by **Moggy** on Thu Mar 04, 2010 12:39 pm

I was having a crap day till i saw this!!! Nice one Charlie :lol:

by **Mike3** on Tue Mar 16, 2010 2:57 am

So how goes the SD card interface project?

by **sirmorris** on Tue Mar 16, 2010 11:03 am

I'm just finishing up my Acorn Atom board and when they start to leave my care I'll be on the zeddy board full-time. I've learned some lessons with the Atom board and these will prove useful

a> prototype it. b> prototype it.

I expect to resume board layout sometime this month with a view to board prduction mid April. I have 2 designs at the moment, one using discrete components which will use bit-banging to drive the MMC card. The other retains the microcontroller which will increase cost ever-so slightly but a> be so much faster and b> provide additional i/o. DMA is off the menu.

The specs currently stand as:

32k RAM (optional)
32K EPROM (4 8k banks)
PIC18 microcontroller giving high-speed mmc access & (at least) 8 independently programmable IO lines.

The board will have a form factor the same as Memotech boards - long and low. This will a> help with wobble and b> allow you to pop one in an old memotech case

I'll plan to have the ability to have a pass-through finger-board on the other side. I need a supplier of edge connectors with longer-than-normal leads though. Anyone know of a place?

I'm torn between using SMT components for size and through-hole for convenience of others. I don't imagine wanting to sell kits, the hard work is in sourcing and collecting components, not the building of it. So this removes some of that worry. Speak up if you have a strong feeling about this.

C

by **Moggy** on Tue Mar 16, 2010 2:43 pm

sirmorris wrote:
The board will have a form factor the same as Memotech boards - long and low

C

No good to Me as a certain knight of the realm conned me out of my beloved Memotech case!!

Seriously though, Sir Morris be aware that the Memopack You have is slightly larger and a slightly different shape to the other Memotech add ons. Ie hires unit, printer interface, keyboard buffer etc; what will fit in one won't fit the others.

Anyway I'm sure You promised Me a MIDI interface HA!! :lol: