SIMPLE-68008

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SIMPLE-68008 FRONT 3D.png

Features

  • 68008 CPU
  • 10 MHz clock
  • 512KB SRAM
  • Up to 512KB EPROM/EEPROM
  • 68681 Dual Serial Port (ACIA)
    • Headers for FTDI
    • 38,400 baud
  • Reset switch with optional Power Supervisor
  • 95x95mm card
  • (4) 6-32 mounting holes

Memory Map

  • 0x00000-0x7FFFF 512KB SRAM
  • 0x80000-0x8FFFF Serial (ACIA)
  • 0x90000-0xFFFFF Up to 8KB EPROM

Chip Set

EBAY 68000 SET.jpg

Design

  • CPU

SIMPLE-68008 U5 CPU.PNG

  • EPROM

SIMPLE-68008 U8 EPROM.PNG

  • SRAM

SIMPLE-68008 U7 SRAM.PNG

  • Dual UART

SIMPLE-68008 U6 DUART.PNG

  • Reset

SIMPLE-68008 U4 RESET.PNG

  • Clock

SIMPLE-68008 U1 OSC.PNG

  • PLDs

SIMPLE-68008 U2 U3 PLDS.PNG

PLDs

==== PLD_001 ====

Name       SIMPLE-68008_PLD_1;
Partno     ATF16V8B;
Date       09/14/22;
Revision   01;
Designer   DOUG G;
Company    LAND BOARDS LLC;
Assembly   U02;
Location   CONNELLSVILLE PA;
Device     G16V8;

/*
*/

/* Inputs */
PIN    1   = CLK;
PIN    2   = !CPUAS;
PIN    3   = !CPUDS;
PIN    4   = CPUA16;
PIN    5   = CPUA17;
PIN    6   = CPUA18;
PIN    7   = CPUA19;
PIN    8   = CPUFC0;
PIN    9   = CPUFC1;
PIN    11  = CPUFC2;
PIN    12  = !DDTACK;
PIN    13  = !SWAP;

/* Outputs */
PIN    14  = !CPUIACK;
PIN    15  = !DUARTCS;
PIN    16  = !CPUDTACK;
PIN    17  = WAIT1;
PIN    18  = !RAMSEL;
PIN    19  = WAIT2;

CPUIACK = CPUFC2 & CPUFC1 & CPUFC0;

DUARTCS = CPUA19 & !CPUA18 & !CPUA17 & !CPUA16 & CPUDS;

RAMSEL = !CPUA19 & SWAP & CPUDS;

CPUDTACK =  CPUA19 & !CPUA18 & !CPUA17 & !CPUA16 & CPUDS & !DDTACK
#           CPUA19 & CPUA18 & CPUDS
#           CPUA19 & CPUA17 & CPUDS
#           CPUA19 & CPUA16 & CPUDS
#          !CPUA19 & CPUDS;


PLD_002

Name       SIMPLE-68008_PLD_2;
Partno     ATF16V8B;
Date       09/14/22;
Revision   01;
Designer   DOUG G;
Company    LAND BOARDS LLC;
Assembly   U03;
Location   CONNELLSVILLE, PA;
Device     G16V8;

/*
	RESET CONTROLLER, ROM CHIP SELECT
*/

/* Inputs */
PIN    1   = CLK;
PIN    2   = !CPUWR;
PIN    3   = !CPUDS;
PIN    4   = CPUA16;
PIN    5   = CPUA17;
PIN    6   = CPUA18;
PIN    7   = CPUA19;
PIN    8   = !POR;
PIN    9   = CPUD0;

/* Outputs */
PIN    14  = SWAP;
PIN    15  = !ROMCS;
PIN    16  = !MEMRD;
PIN    18  = !CPUHLT;
PIN    19  = !CPURES;

/* CLEAR SWAP AT POWER UP, RESET	*/
/* SET SWAP BY FIRST WRITE	 TO EPROM SPACE		*/
SWAP.D = CPUDS &  CPUWR & CPUA19 & CPUA18 & CPUA17 & CPUA16 & CPUD0 & !POR
#        SWAP  & !POR;

ROMCS = CPUDS & !CPUWR & CPUA19 & CPUA18
#       CPUDS & !CPUWR & CPUA19 & CPUA17
#       CPUDS & !CPUWR & CPUA19 & CPUA16
#       CPUDS & !CPUA19 & !CPUA18 & !CPUA17 & !CPUA16 & !SWAP;

CPUHLT_N.OE = POR;
CPUHLT_N = POR;

CPURES_N.OE = POR;
CPURES_N = POR;

Headers / Connectors

SIMPLE-68008 REV1 CAD.PNG

J1 - 2 port FTDI / TTL Serial

  1. GND
  2. CTS* (in)
  3. +5V
  4. Transmit (out)
  5. Receive (in)
  6. RTS* (out)

J2 - Input Port

  1. Input 2
  2. Input 5
  3. Input 4
  4. Input 3
  5. Vcc
  6. GND

J3 - Output Port

  1. GND
  2. Vcc
  3. Output 7
  4. Output 6
  5. Output 5
  6. Output 4
  7. Output 3
  8. Output 2

H1 - 5V Power

  • 2x4 header

H3-H5 - EPROM/EEPROM Select Jumpers

  • H2 = EE PIN 31
  • H3 = EE PIN 3
  • H4 = EE PIN 30
  • H5 = EE PIN 29
27040 27020 27010 27512 27256 27128 2764 PIN(32) PIN(28) PIN(28) PIN(32) 2764 27128 27256 27512 27010 27020 27040
VPP VPP VPP N/A N/A N/A N/A 1 N/A N/A 32 N/A N/A N/A N/A VCC VCC VCC
A16 A16 A16 N/A N/A N/A N/A 2 N/A N/A 31 (H2) N/A N/A N/A N/A PGM PGM A18
A15 A15 A15 A15 VPP VPP VPP 3 (H3) 1 28 30 (H4) VCC VCC VCC VCC N/C A17 A17
A12 A12 A12 A12 A12 A12 A12 4 2 27 29 (H5) PGM PGM A14 A14 A14 A14 A14
A7 A7 A7 A7 A7 A7 A7 5 3 26 28 A13 A13 A13 A13 A13 A13 A13
A6 A6 A6 A6 A6 A6 A6 6 4 25 27 A8 A8 A8 A8 A8 A8 A8
A5 A5 A5 A5 A5 A5 A5 7 5 24 26 A9 A9 A9 A9 A9 A9 A9
A4 A4 A4 A4 A4 A4 A4 8 6 23 25 A11 A11 A11 A11 A11 A11 A11
A3 A3 A3 A3 A3 A3 A3 9 7 22 24 OE* OE* OE* OE* OE* OE* OE*
A2 A2 A2 A2 A2 A2 A2 10 8 21 23 A10 A10 A10 A10 A10 A10 A10
A1 A1 A1 A1 A1 A1 A1 11 9 20 22 CE* CE* CE* CE* CE* CE* CE*
A0 A0 A0 A0 A0 A0 A0 12 10 19 21 D7 D7 D7 D7 D7 D7 D7
D0 D0 D0 D0 D0 D0 D0 13 11 18 20 D6 D6 D6 D6 D6 D6 D6
D1 D1 D1 D1 D1 D1 D1 14 12 17 19 D5 D5 D5 D5 D5 D5 D5
D2 D2 D2 D2 D2 D2 D2 15 13 16 18 D4 D4 D4 D4 D4 D4 D4
GND GND GND GND GND GND GND 16 14 15 17 D3 D3 D3 D3 D3 D3 D3

Software

Mechanicals

SIMPLE-68008 REV1 MECHS.PNG

Assembly Sheet

SIMPLE-68008 Rev 1 Assembly Sheet