finally more VRAM

Post Reply
KnaxMax
Posts: 13
Joined: Mon Feb 05, 2018 3:53 pm
Location: Munich - Germany

finally more VRAM

Post by KnaxMax » Tue Feb 13, 2018 11:35 am

Hi,

after more than 30 years, a dream became true for me: I have extended my MZ-800 with the additional 16KB of VRAM.
Now I can use all 16 colors at once (at 'lores' 320x200 - and 4 colors at 'hires' 640x200).

Back in 1986-88 I had no idea how to get Sharps VRAM extension and what it would cost (surely more than I could afford).
Years later I read somewhere on the Web, that Sharp just used some standard DRAM chips of the time.

It is called MB81416-12 (16kx4 DRAM) from Fujitsu and I could find a pair on Ebay (Germany) for just 3.5€ :
https://www.ebay.de/itm/2x-MB81416-12-1 ... 2056573597

It's two chips and it has to be the 120ns version (not MB81416-15).

In theory there should be chips with the same specs from TI ( TMS4416-12NL) but not tested it.
The standard VRAM on my MZ-800 board are at least from Fujitsu.

hlide
Posts: 23
Joined: Thu Jan 25, 2018 9:31 pm

Re: finally more VRAM

Post by hlide » Tue Feb 13, 2018 6:26 pm

UTSOURCE:
FR
DE
UK

goev
Posts: 14
Joined: Wed Jan 17, 2018 9:33 pm

Re: finally more VRAM

Post by goev » Wed Feb 14, 2018 7:19 am

Nice!
I did the same a couple of years ago. My dad bought the extra V-RAM in '86 for the 800 we had back then. I'm pretty sure he did pay a lot more than €3.5 :D

hlide
Posts: 23
Joined: Thu Jan 25, 2018 9:31 pm

Re: finally more VRAM

Post by hlide » Wed Feb 14, 2018 12:01 pm

€3.5 is without the shipment fee: €3.5 + €8.5 = €12 for two chips? if so, that's a good price.

hlide
Posts: 23
Joined: Thu Jan 25, 2018 9:31 pm

Re: finally more VRAM

Post by hlide » Wed Feb 14, 2018 2:55 pm

Since the price was for two chips, I decided to buy them as well.

KnaxMax
Posts: 13
Joined: Mon Feb 05, 2018 3:53 pm
Location: Munich - Germany

Re: finally more VRAM

Post by KnaxMax » Wed Feb 14, 2018 4:19 pm

hlide wrote:
Wed Feb 14, 2018 12:01 pm
€3.5 is without the shipment fee: €3.5 + €8.5 = €12 for two chips? if so, that's a good price.
As I'm in Germany shipping fee was just €2.2.
So cost was not much more than a Quickdisk 30 years ago (10DM ~ €5).

Post Reply