Exile In Paradise

Stranded on Earth...

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sst-6809:top [2024/10/24 20:00] – [Getting Started] robertsst-6809:top [2025/02/01 07:26] (current) – [M8 Motorino and VDP09] robert
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 ====== SST-6809 Single Board Computer ====== ====== SST-6809 Single Board Computer ======
  
-{{sst-6809-2.0.png?512}}+^  SST-6809 SBC V2.0  ^  SST-6809 SBC V2.1  ^ 
 +|  {{sst-6809-2.0.png?512|SST-6809 SBC V2.0}}  |  {{sst-6809-2.1.png?512|SST-6809 SBC V2.1}}  |
  
 [[https://github.com/KenWillmott/SST-6809]] [[https://github.com/KenWillmott/SST-6809]]
  
-^ Part ^ Integrated Circuit ^ +^  V2.0 Part  ^  Integrated Circuit  ^ 
-| U1 | Motorola MC68B09 or Hitachi HD63C09 MPU | +|  U1  |  Motorola MC68B09 or Hitachi HD63C09 MPU  | 
-| U2 | Texas Instruments SN74HCT273N Octal Flip-Flop with Reset | +|  U2  |  Texas Instruments SN74HCT273N Octal Flip-Flop with Reset  | 
-| U3 | Alliance AS6C4008-55PCN 4Mbit / 512KB SRAM | +|  U3  |  Alliance AS6C4008-55PCN 4Mbit / 512KB SRAM  | 
-| U4 | Motorola MC68B50 or Hitachi HD63B50 ACIA | +|  U4  |  Motorola MC68B50 or Hitachi HD63B50 ACIA  | 
-| U5 | Dallas Semiconductor DS1813 EconoReset | +|  U5  |  Dallas Semiconductor DS1813 EconoReset  | 
-| U6 | Phillips 74HCT02N Quad 2-Input NOR | +|  U6  |  Phillips 74HCT02N Quad 2-Input NOR  | 
-| U7 | Dallas Semiconductor DS1210 Nonvolatile Controller |  +|  U7  |  Dallas Semiconductor DS1210 Nonvolatile Controller  |  
-| U8 | Shenzhen Honglifa HLF SN74HCT139N Dual 2-to-4 Line Decoder / Demultiplexer | +|  U8  |  Shenzhen Honglifa HLF SN74HCT139N Dual 2-to-4 Line Decoder / Demultiplexer  | 
-| U9 | Atmel At28C256 256Kbit / 32KB Parallel EEPROM | +|  U9  |  Atmel At28C256 256Kbit / 32KB Parallel EEPROM  | 
-| U10 | Motorola MC74HCT138AN 3-to-8 Line Decoder / Demultiplexer | +|  U10  |  Motorola MC74HCT138AN 3-to-8 Line Decoder / Demultiplexer  | 
-| U11 | Dallas Semiconductor DS1233 EconoReset | +|  U11  |  Dallas Semiconductor DS1233 EconoReset  | 
-| U12 | :!: | +|  U12  |  - not present -  | 
-| U13 | Phillips 74HCT20N Dual 4-input NAND |+|  U13  |  Phillips 74HCT20N Dual 4-input NAND  |
  
 The [[Memory Map]] and Bank Switching. The [[Memory Map]] and Bank Switching.
 +
 +===== Jumpers =====
 +
 +==== JP2 ====
 +
 +JP2 connects to on-board 3.0V coin cell to the backup circuit.
 +
 +The purpose is to provide an easy way to clear the NVRAM contents on the V2.1 SBC.
 +
 +==== JP3 ====
 +
 +^  JP3  ^  Selects  ^
 +|  1-2  |  External 5V from screw terminals  |
 +|  2-3  |  5V Comes from USB serial adapter  |
 +
 +Some boards like the [[#M8 Game Board]] use too much power for the USB port to supply.
 +
 +In that case, external regulated 5V should be connect to the screw terminals, and the jumper on JP3 should be moved to pins 1-2.
 +
 +Otherwise, it should join pins 2-3 for USB power.
 +
 +This is done to prevent 5V board power from backfeeding into the USB port.
 +
 +==== JP5 ====
 +
 +^  JP5  ^  SBC V2.1 Boot ROM Select ((SBC V2.0 has two jumpers for ROM select.))  ^
 +|  1-2  |  normal  |
 +|  2-3  |  ROM A14 inverted  |
 +
 +In the normal position, the system boots from the top of the 32K EEPROM
 +
 +In the inverted position, it boots from code at the top of the lower 16K of the same EEPROM.
 +
 +This control bit originates from the latch, so it can be changed by writing the latch, regardless of position.
 +
 +==== J4 ====
 +
 +^  J4  ^  Main Serial Connector  ^
 +|  1  |  Ground  |
 +|  2  |  VCC (5V)  |
 +|  3  |  Transmit Data (TXD)  |
 +|  4  |  Receive Data (RXD)  |
 +|  5  |  Data Terminal Ready (DTR) - Not Connected  |
 +|  6  |  3V3 - Not Connected  |
 +
 +==== J5 ====
 +
 +J5 exposes some 6x09 signals that do not appear on [[#The M8 Bus]]
 +
 +^  J5 Pin  ^  Signal  ^
 +|  1  |  6x09 Bus Status (BS)  |
 +|  2  |  NVBAT  |
 +|  3  |  6x09 /FIRQ "Fast" Interrupt Request  |
 +|  4  |  6x09 /RESET Reset Interrupt Request  |
 +|  5  |  M8 Bus Select 1 (BSEL1)  |
 +|  6  |  Ground  | 
 +
 +The NVBAT pin on J5 has two possible uses.
 +
 +It is connected directly to the on board battery.
 +
 +So it can either be used to replace the on board with an external battery, or can convey backup power to additional circuits such as, for example, an RTC.
 +
 +==== J6 ====
 +
 +J6 Access to the secondary battery connection and additional serial signals.
 +
 +The DS1210 NVRAM controller supports two backup batteries.
 +
 +J6 provides access to the secondary battery.
 +
 +This should have a jumper between pin 1 and 2 to ground BAT2 if it's not in use.
 +
 +It makes it possible to use an external battery.
 +
 +One important purpose of the BAT2 connection, is that the on board battery may be removed for replacement without incurring memory loss, provided that a second battery is temporarily connected to GND and BAT2 on J6.
 +
 +^  J6 Pin  ^  Purpose  ^
 +|  1  |  Ground  |
 +|  2  |  Battery 2  |
 +|  3  |  Serial Ready To Send (RTS)  |
 +|  4  |  Serial Data Terminal Ready (DTR)  |
 +
 +===== SBC Reset Circuit =====
 +
 +There are three footprints for a reset circuit on the board. 
 +
 +Only one should be populated for use.
 +
 +The basic RC does work but some future devices may not tolerate the slow rise time.
 +
 +There is a footprint for a DS1813 or for a DS1233 - these are obsolete parts but better than the RC reset solution if they are available.
 +
 +===== The M8 Bus =====
  
 The M8 bus design allows using the most advanced ICs that were available at the time, without regard to brand and fully supports DMA with the 6809 as well. The M8 bus design allows using the most advanced ICs that were available at the time, without regard to brand and fully supports DMA with the 6809 as well.
 +
 +Note: The board decodes two bus select signals BSEL0 and BSEL1, only BSEL0 is routed to the M8 bus.
 +
 +The additional decode could be routed to circuits on peripheral cards, using fly wire jumpers, for development purposes.
  
 ===== M8 Game Board ===== ===== M8 Game Board =====
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 [[https://github.com/KenWillmott/6522-proto]] [[https://github.com/KenWillmott/6522-proto]]
 +
 +===== M8 Blinkenlights =====
 +
 +:!: Coming soon
  
 ===== Software ===== ===== Software =====
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 ===== TinyBASIC ===== ===== TinyBASIC =====
  
-TinyBASIC [[https://github.com/jefftranter/6809/tree/master/sbc/tinybasic|Jeff Tranter's 6809 SBC repo]] loads and runs with the S19 steps above.+TinyBASIC from [[https://github.com/jefftranter/6809/tree/master/sbc/tinybasic|Jeff Tranter's 6809 SBC repo]] loads and runs with the S19 steps above.
  
 Then, start TinyBASIC with: Then, start TinyBASIC with:
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   >G 1000   >G 1000
   !   !
- 
-The [[http://www.lwtools.ca/|Lost Wizard Assembler (lwasm)]] can output assembled code as S-records, usually saved as .s19 files. 
  
 ===== Additional Software ===== ===== Additional Software =====
  
-  * [[PSYMON]] 1.20B by Percom Data Systems+The [[http://www.lwtools.ca/|Lost Wizard Assembler (lwasm)]] can output assembled code as S-records, usually saved as .s19 files. 
 + 
 +With it, I have also adapted the following to execute:  
 +  * [[PSYMON]] 1.20B by Percom Data Systems 
   * [[BUGGY]] 1.01 by Lennart Benschop   * [[BUGGY]] 1.01 by Lennart Benschop
  
 +===== M8 Motorino and VDP09 =====
 +
 +The M8 family grew with the addition of the M8 Game Board (code name Motorino):
 +
 +{{:sst-6809:sst_and_game_board.png?400|SST-6809 V2.1 with M8 Game Board}}
 +
 +The SST-6809 V2.1 board is on the left and the M8 Game Board is on the right.
 +
 +{{:sst-6809:vdp09.png?400|M8 Game Board running VDP09 Demo}}
 +
 +The M8 Game Board brings a TI TMS9918A Video Display Processor (think ColecoVision graphics), a Phillips SAA1099P six-channel stereo sound generator, 2 digital joystick ports, and a Motorola 6850 or Hitachi 6350 serial ACIA port.
 +
 +Here, the M8 Game Board runs a VDP09 demo with a bouncing sprite over a changing Graphics II mode background. 
 ===== Future ... ===== ===== Future ... =====
  
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 ===== Additional Resources ===== ===== Additional Resources =====
 +  * [[https://archive.org/details/6809_Assembly_Language_Programming_by_Lance_Leventhal|6809 Assembly Language Programming]] by Lance Leventhal  
 +  * [[https://archive.org/details/assembly-language-subroutines-for-the-6809_Leventhal|Assembly Language Subroutines for the 6809]] by Lance Leventhal
   * [[http://searle.x10host.com/6809/Simple6809.html|Grant Searle's Simple 6809]]   * [[http://searle.x10host.com/6809/Simple6809.html|Grant Searle's Simple 6809]]
   * [[http://jefftranter.blogspot.com/2019/01/a-6809-single-board-computer.html|Jeff Tranter's 6809 Single Board Computer]]   * [[http://jefftranter.blogspot.com/2019/01/a-6809-single-board-computer.html|Jeff Tranter's 6809 Single Board Computer]]