Difference between revisions of "LB-MEM-02"

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[[file:LB-MEM-02_REV1-FRONT-3D.png]]
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[[file:LB-MEM-02_P1660-720px.jpg]]
  
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== Features ==
 
* 32KB SRAM
 
* 32KB SRAM
−
* EPROM
+
* 16KB EPROM
−
** Headers to jump for smaller cards
+
** Headers to select PROM bank
 
* Connects to Address/Data and Memory control lines
 
* Connects to Address/Data and Memory control lines
 
* 50x75mm card
 
* 50x75mm card
 +
 +
== Design ==
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=== SRAM ===
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 +
[[file:LB-MEM-02-SRAM.PNG]]
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=== EPROM ===
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* ATF16V8B part
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* [[TL866ii_Plus_Programmer]]
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[[file:LB-MEM-02-PROM.PNG]]
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* [[LB-65CXX-01]] card has 16 KB PROM from 0xC000-0xFFFF
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* [[LB-6802-01]] card has 16 KB PROM from 0xC000-0xFFFF
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* [[LB-6809-01]] card has 16 KB PROM from 0xC000-0xFFFF
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* [[LB-Z80-01]] card has 8KB PROM from 0x0000-0x1FFF (upper 8KB is not used)
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==== Parts/Jumpers ====
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* Square pin is pin 1
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[[FILE:LB-MEM-02_REV1_MECH_Ann.png]]
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==== 27C256/27C512 EPROMs ====
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* Card has a 16KB size from the CPU
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* 27C256 (32KB) and 27C512 (64KB) Flash EPROMs are commonly available
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* Jumpers allow firmware banks to be selected
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** 2 banks in 27C256
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** 4 banks in 27C512
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{| class="wikitable"
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! EPROM
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! SIZE
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! BANKS
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! J6(A15/Pin1)
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! J2(A14/Pin27)
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! BANK #
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! LOAD OFFSET
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|-
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| 27C128
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| 16KB
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| 1
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| 2-3 (GND)
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| 2-3 (GND)
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| 1
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| 0x0000
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|-
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| 27C256
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| 32KB
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| 2
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| 2-3 (GND)
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| 1-2 (VCC)
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| 1
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| 0x0000
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|-
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| 27C256
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| 32KB
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| 2
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| 2-3 (GND)
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| 2-3 (GND)
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| 2
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| 0x4000
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|-
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| 27C512
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| 64KB
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| 4
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| 2-3 (GND)
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| 2-3 (GND)
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| 1
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| 0x0000
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|-
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| 27C512
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| 64KB
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| 4
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| 2-3 (GND)
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| 1-2 (VCC)
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| 2
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| 0x4000
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|-
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| 27C512
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| 64KB
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| 4
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| 1-2 (VCC)
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| 2-3 (GND)
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| 3
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| 0x8000
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|-
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| 27C512
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| 64KB
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| 4
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| 1-2 (VCC)
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| 1-2 (VCC)
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| 4
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| 0xC000
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|-
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|}
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[[file:LB-MEM-02_EPROM_27C128_256_512.png]]
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=== Backplane Connector ===
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[[file:LB-MEM-02-BKPL.PNG]]
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== Mechanicals ==
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=== Rev 3 ===
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=== Rev 2 ===
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[[file:LB-MEM-02_Rev2_MECH.PNG]]
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=== Rev 1 ===
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 +
[[file:LB-MEM-02_REV1_MECH.PNG]]
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== Checkout ==
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=== Rev 3 ===
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* Adds PWR and GND on U1 (74HC04)
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* Adds electrolytic cap footprint
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=== Rev 2 ===
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* Flips 74HC04 orientation
 +
* Missing PWR and GND on U1 (74HC04)
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* Tested with [[LB-6809-01]] card
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** Works
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=== Rev 1 ===
 +
 +
* Missing PWR and GND on U1 (74HC04)
 +
** Added PWR and GND wires to nearest pins with PWR and GND
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* SRAM passes in TL866 in SRAM test mode
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* Test using [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] software
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** [https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6809/LB-6809/ramLoop/ramLoop.asm ramLoop.asm] code works on [http://6809.uk/ 6809 Emulator]
 +
*** Forcing an error works
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** Check on card without SRAM
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*** Controls/data look OK
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== Assembly Sheet ==
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=== Rev 3 ===
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* [https://land-boards.com/LB-MEM-02/LB-MEM-02_Rev3_ibom.html Interactive BOM]
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=== Rev 1 ===
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* [https://land-boards.com/LB-MEM-02/LB-MEM-02_Rev1_ibom.html Interactive BOM]

Revision as of 18:41, 12 September 2024

LB-MEM-02 P1660-720px.jpg


Features

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

Design

SRAM

LB-MEM-02-SRAM.PNG

EPROM

LB-MEM-02-PROM.PNG

  • LB-65CXX-01 card has 16 KB PROM from 0xC000-0xFFFF
  • LB-6802-01 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)

Parts/Jumpers

  • Square pin is pin 1

LB-MEM-02 REV1 MECH Ann.png

27C256/27C512 EPROMs

  • Card has a 16KB size from the CPU
  • 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
EPROM SIZE BANKS J6(A15/Pin1) J2(A14/Pin27) BANK # LOAD OFFSET
27C128 16KB 1 2-3 (GND) 2-3 (GND) 1 0x0000
27C256 32KB 2 2-3 (GND) 1-2 (VCC) 1 0x0000
27C256 32KB 2 2-3 (GND) 2-3 (GND) 2 0x4000
27C512 64KB 4 2-3 (GND) 2-3 (GND) 1 0x0000
27C512 64KB 4 2-3 (GND) 1-2 (VCC) 2 0x4000
27C512 64KB 4 1-2 (VCC) 2-3 (GND) 3 0x8000
27C512 64KB 4 1-2 (VCC) 1-2 (VCC) 4 0xC000

LB-MEM-02 EPROM 27C128 256 512.png

Backplane Connector

LB-MEM-02-BKPL.PNG

Mechanicals

Rev 3

Rev 2

LB-MEM-02 Rev2 MECH.PNG

Rev 1

LB-MEM-02 REV1 MECH.PNG

Checkout

Rev 3

  • Adds PWR and GND on U1 (74HC04)
  • Adds electrolytic cap footprint

Rev 2

  • Flips 74HC04 orientation
  • Missing PWR and GND on U1 (74HC04)
  • Tested with LB-6809-01 card
    • Works

Rev 1

  • Missing PWR and GND on U1 (74HC04)
    • Added PWR and GND wires to nearest pins with PWR and GND
  • SRAM passes in TL866 in SRAM test mode
  • Test using ramLoop.asm software

Assembly Sheet

Rev 3

Rev 1

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