Difference between revisions of "LB-MEM-04"

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[[file:LB-MEM-04-SRAM.PNG]]
 
[[file:LB-MEM-04-SRAM.PNG]]
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==== SRAM Pinouts ====
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[[FILE:SRAM_PINOUTS.png]]
  
 
=== EPROM ===
 
=== EPROM ===

Revision as of 01:35, 25 August 2024

LB-MEM-04 REV1-FRONT-3D.png


Features

  • 32/128KB/512KB SRAM
  • 16/32/64KB EPROM
    • Headers to select PROM bank
  • Connects to Address/Data and Memory control lines
  • 50x75mm card

Design

SRAM

LB-MEM-04-SRAM.PNG

SRAM Pinouts

SRAM PINOUTS.png

EPROM

LB-MEM-04-PROM.PNG

  • LB-65CXX-01 card has 16 KB PROM from 0xC000-0xFFFF
  • LB-6809-01 card has 16 KB PROM from 0xC000-0xFFFF
  • LB-Z80-01 card has 8KB PROM from 0x0000-0x1FFF (upper 8KB is not used)

27C256/27C512 EPROMs

  • Card has a 16KB size
  • 27C256 (32KB) and 27C512 (64KB) Flash EPROMs are commonly available
  • Jumpers allow firmware banks to be selected
    • 2 banks in 27C256
    • 4 banks in 27C512

LB-MEM-03 EPROM 27C256 512.PNG

Backplane Connector

LB-MEM-04-BKPL.PNG

Mechanicals

LB-MEM-04 REV1 MECH.PNG

Checkout

Rev 1

  • OK

Assembly Sheet

Rev 1

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