LB-65CXX-01

Features

• 65C02 or 65C816 CPU
• 2 MHz Oscillator on card
• Reset switch/power monitor
• Address decoder PLD drives RAM/ROM/IO chip selects
• 100x50mm card

Design

Memory Map

0x0000-0x7FFF - 32KB SRAM
0x8000-0x8FFF - 4KB I/O space
0x9000-0xBFFF - 12 KB SRAM (Using 128KB SRAM)
0xC000-0xFFFF - 16KB EPROM space

CPU

• 65C02 or 65C816 CPU
• 2 MHz
• Install jumper J2:1-2 if CPU is not a WDC 65C02 or WDC 65C816

R65C02 vs W65C02 CPUs

R65C02 vs W65C02 pin differences

• Pin 1
  • R65C02 = VSS J2:1-2
  • W65C02 = VPB J2:2-3 - Vector Pull
• Pin 5
  • R65C02 = NC
  • W65C02 = MLB - Memory Lock
• Pin 36
  • R65C02 = NC
  • W65C02 = BE - Bus Enable

Oscillator

PLD

PLD Listing

Name       LB-65CXX-01_PLD;
Partno     ATF16V8B;
Date       08/18/24;
Revision   01;
Designer   DOUG G;
Company    LAND BOARDS LLC;
Assembly   LB65CXX01_U2;
Location   Rustbelt, US;
Device     G16V8;

/*
	65C816 Control
*/


/* Control inputs */
PIN    1   = CLK;
PIN    2   = CPUA12;
PIN    3   = CPUA13;
PIN    4   = CPUA14;
PIN    5   = CPUA15;
PIN    6   = CPUREAD;
PIN    8   = VPA;
PIN    9   = VDA;

/* Counter data inputs */
PIN    13  = !IOCS;
PIN    14  = !ROMCS;
PIN    15  = !MEMRD;
PIN    16  = !RAMCS;
PIN    18  = RDY;

RAMCS = !CPUA15 & VDA								/* 0x0000-0x7FFF (32KB/64KB SRAM)	*/
#        CPUA15 & !CPUA14 & !CPUA13 & CPUA12 & VDA	/* 0x9000-0x9FFF (128KB SRAM)		*/
#        CPUA15 & !CPUA14 &  CPUA13 & VDA;			/* 0xA000-0xBFFF (128KB SRAM)		*/

IOCS = CPUA15 & !CPUA14 & !CPUA13 & !CPUA12 & VDA;	/* 0x8000-0x8FFF (4KB space)		*/

ROMCS = CPUA15 & CPUA14 & CPUREAD & VDA;			/* 0xC000-0xFFFF (16KB space)		*/

MEMRD = CPUREAD & VDA;

/*
RDY = VPA
#     VDA;
*/

Reset Controller

• DS1813-5 Reset Controller
• 5V Power Monitor
• Reset controller
• Reset pushbutton to ground

Backplane connector

RAMCS = !CPUA15 & VDA /* 0x0000-0x7FFF (32KB/64KB SRAM) */

1. CPUA15 & !CPUA14 & !CPUA13 & CPUA12 & VDA /* 0x9000-0x9FFF (128KB SRAM) */
2. CPUA15 & !CPUA14 & CPUA13 & VDA; /* 0xA000-0xBFFF (128KB SRAM) */

IOCS = CPUA15 & !CPUA14 & !CPUA13 & !CPUA12 & VDA; /* 0x8000-0x8FFF (4KB space) */

ROMCS = CPUA15 & CPUA14 & CPUREAD & VDA; /* 0xC000-0xFFFF (16KB space) */