6502.org Forum  Projects  Code  Documents  Tools  Forum
It is currently Wed Nov 13, 2024 6:14 am

All times are UTC




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Fri Mar 15, 2019 1:34 pm 
Offline
User avatar

Joined: Wed Aug 17, 2005 12:07 am
Posts: 1250
Location: Soddy-Daisy, TN USA
Sorry, this is a little OT but I just got a TRS-80 Model 1 and when looking inside, I see 8 chips that are MCM6616L6.

When searching for those chips, I cannot find much of anything. Especially a datasheet.

I assume the 6616 section means 16 Kb. As in, 16,384 bits (2 KB). But that doesn't sound right because I believe all TRS-80's had at least 4 KB.

I've never claimed to understand how DRAM works. :-)

Also, notice the date code! I think these are literally the oldest electronic components I have. It's certainly the oldest computer I have (7937).


Attachments:
Photo Mar 14, 7 20 44 PM.jpg
Photo Mar 14, 7 20 44 PM.jpg [ 7.03 MiB | Viewed 416 times ]

_________________
Cat; the other white meat.
Top
 Profile  
Reply with quote  
PostPosted: Fri Mar 15, 2019 2:00 pm 
Offline
User avatar

Joined: Wed Feb 14, 2018 2:33 pm
Posts: 1485
Location: Scotland
cbmeeks wrote:
Sorry, this is a little OT but I just got a TRS-80 Model 1 and when looking inside, I see 8 chips that are MCM6616L6.

When searching for those chips, I cannot find much of anything. Especially a datasheet.

I assume the 6616 section means 16 Kb. As in, 16,384 bits (2 KB). But that doesn't sound right because I believe all TRS-80's had at least 4 KB.

I've never claimed to understand how DRAM works. :-)

Also, notice the date code! I think these are literally the oldest electronic components I have. It's certainly the oldest computer I have (7937).


They are '4116' DRAM chips: 16Kx1, so 16KB in total.

See e.g. http://www.minuszerodegrees.net/memory/4116.htm

-Gordon

_________________
--
Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/


Top
 Profile  
Reply with quote  
PostPosted: Fri Mar 15, 2019 3:21 pm 
Offline
User avatar

Joined: Wed Aug 17, 2005 12:07 am
Posts: 1250
Location: Soddy-Daisy, TN USA
Ah thanks!

And, yeah...dur. I sometimes forget that the byte is "spread out" across the 8 chips. SRAM is so much easier to understand. lol

_________________
Cat; the other white meat.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 9 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: