Model 100 RAM: Difference between revisions

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==Modules you can buy==
[https://www.arcadeshopper.com/wp/?page_id=11#!/8k-RAM-module-for-Model-100/p/104430801/category=28313042 Francesco Messineo] 
[https://www.ebay.com/itm/402652485830 GGLABS M10MEM]


==DIY modules==
==DIY modules==
Francesco Messineo [https://drive.google.com/open?id=1U_T8bdf7bJZ8vM9IxSQHVU1slsC0df1o Gerbers for DIY] [https://www.arcadeshopper.com/wp/?page_id=11#!/8k-RAM-module-for-Model-100/p/104430801/category=28313042 Buy pre-made]
[https://oshpark.com/shared_projects/wn2DEsJc Stardust SMT] 
[https://oshpark.com/shared_projects/8ZE4c4ue Stardust DIP] 
[https://drive.google.com/open?id=1U_T8bdf7bJZ8vM9IxSQHVU1slsC0df1o Francesco Messineo]  
[https://gglabs.us/node/2100 GGLABS M10MEM]


Stardust [https://oshpark.com/shared_projects/8ZE4c4ue DIP version]  [https://oshpark.com/shared_projects/wn2DEsJc SMT version]
==Past Modules==
 
==NEC module==
There was an NEC module on ebay for a while. These work in Model 100.


* There was an NEC module on ebay for a while. These work in Model 100. 
Strangely, although these are NEC modules with an NEC sram chip, and they do work in the NEC PC-8201/8201A, they aren't what you ever see installed in an NEC. PC-8201 always have the same purple ceramic modules as the TRS-80 Model 100. 
[https://goo.gl/photos/gGVSWwGiv9NSwveR7 NEC D4364G Module] 
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Pics https://goo.gl/photos/gGVSWwGiv9NSwveR7
Components:
 
:NEC D4364G-15L
 
:TIHC148 (aka 74HC148)
If someone wants to clone the design, I have a few of these and can send you one.
 
8k (8,192-word) × 8-bit Static RAM


Components:<br>
* Purple Computing
NEC D4364G-15L<br>
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TIHC148 (Texas Instruments' 74HC148)


Length 36mm / 1.42"<br>
* There have actually been many 3rd-party ram modules, especially back when the Model 100 was current. Most are not listed here yet.
Width 22mm / 0.87"<br>
row spacing 19mm / 0.74"<br>
pin pitch 2.54mm / 0.1"


==Other==
==Other==
There are also ram expansion accessories that connect to the system bus and either add extra banks of 32k to the internal ram, or replace the internal ram. These aren't normal ram modules that plug into the normal ram sockets. They plug in to the system bus cnnector and provide the entire 32K address space at once from there, as if all ram sockets were filled.
:[[QUAD]]
:[[QUAD]]
:[[PGDesigns]]
:[[PGDesigns]]
:[[PCSG]]
:[[REXCPM]]

Revision as of 02:25, 26 February 2021

Modules you can buy

Francesco Messineo GGLABS M10MEM

DIY modules

Stardust SMT Stardust DIP Francesco Messineo GGLABS M10MEM

Past Modules

  • There was an NEC module on ebay for a while. These work in Model 100.

Strangely, although these are NEC modules with an NEC sram chip, and they do work in the NEC PC-8201/8201A, they aren't what you ever see installed in an NEC. PC-8201 always have the same purple ceramic modules as the TRS-80 Model 100. NEC D4364G Module Components:

NEC D4364G-15L
TIHC148 (aka 74HC148)
  • Purple Computing
  • There have actually been many 3rd-party ram modules, especially back when the Model 100 was current. Most are not listed here yet.

Other

There are also ram expansion accessories that connect to the system bus and either add extra banks of 32k to the internal ram, or replace the internal ram. These aren't normal ram modules that plug into the normal ram sockets. They plug in to the system bus cnnector and provide the entire 32K address space at once from there, as if all ram sockets were filled.

QUAD
PGDesigns
PCSG
REXCPM