LB-MEM-02

Features

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

Design

SRAM

EPROM

• ATF16V8B part
• TL866ii_Plus_Programmer

• 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

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

Backplane Connector

Mechanicals

Rev 2

Rev 1

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
  • ramLoop.asm code works on 6809 Emulator
    • Forcing an error works
  • Check on card without SRAM
    • Controls/data look OK

Assembly Sheet

Rev 3

• Interactive BOM

Rev 1

• Interactive BOM