ZX81 ROMs 3 types?

Discussions about Sinclair ZX80 and ZX81 Hardware
Fruitcake
Posts: 205
Joined: Wed Sep 01, 2010 10:53 pm

Re: ZX81 ROMs 3 types?

Post by Fruitcake »

1024MAK wrote: Sun Apr 25, 2021 4:03 pm So it is still surprising that this was not previously known about...
And not referenced in any publication (I have seen) from the time, and yet someone appears to know detailed information about why and when each ROM was released... Where did they get that information from? Who would know such detailed information?
Lardo Boffin
Posts: 1432
Joined: Sat Nov 26, 2016 2:42 am

Re: ZX81 ROMs 3 types?

Post by Lardo Boffin »

Fruitcake wrote: Sun Apr 25, 2021 4:16 pm
1024MAK wrote: Sun Apr 25, 2021 4:03 pm So it is still surprising that this was not previously known about...
And not referenced in any publication (I have seen) from the time, and yet someone appears to know detailed information about why and when each ROM was released... Where did they get that information from? Who would know such detailed information?
I have asked the seller. Hopefully they will get back to me.

Looks like they are Sinclair fans?

https://www.ebay.co.uk/itm/ZX80-ROM-ADA ... 890.l49286
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Toastrack
Fruitcake
Posts: 205
Joined: Wed Sep 01, 2010 10:53 pm

Re: ZX81 ROMs 3 types?

Post by Fruitcake »

Lardo Boffin wrote: Sun Apr 25, 2021 5:33 pm I have asked the seller. Hopefully they will get back to me.
Was thinking to do the same but don't want to flood them with such queries so will will wait to hear if they respond to you.

Lardo Boffin wrote: Sun Apr 25, 2021 5:33 pm Looks like they are Sinclair fans?
https://www.ebay.co.uk/itm/ZX80-ROM-ADA ... 890.l49286
Yes, that is interesting also. Not just selling old items that might have been archived decades ago, but also brand new stuff...
balford
Posts: 103
Joined: Tue Dec 03, 2013 11:20 pm
Location: Dublin, Ireland

Re: ZX81 ROMs 3 types?

Post by balford »

Heh, I considered myself fairly well informed about all things Sinclair and I didn't have a clue about the intermediate ROM!

It seems uncommon rather than rare though, out of 14 Zeddys I own, 3 of them have the 622 version.

If we're talking dates, then on my machines they occur on machines with a ULA date range between 8128 and 8140. Obviously up to now people have paid more attention to ULA date codes than anything else :)
Moggy
Posts: 2375
Joined: Wed Jun 18, 2008 2:00 pm

Re: ZX81 ROMs 3 types?

Post by Moggy »

Hey up Balford long time no hear!!

Do you still have that Issue one ULA I sent you?

If I'd have realised that postage to your part of the world was so expensive I'd have hired a container and sent you my whole bloody collection!! :lol:


Nice to see you're still around. :D



Regards.

Moggy.
balford
Posts: 103
Joined: Tue Dec 03, 2013 11:20 pm
Location: Dublin, Ireland

Re: ZX81 ROMs 3 types?

Post by balford »

Nice to see you too Moggy, I dip my toe in now and again :)

I certainly do still have that 2C158E, providing sterling service to this day in a kludge ROM Zeddy!
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