PT69-5 6809 Single Board Computer

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This was the last 6809 based board designed by Peripheral Technology.  This board was designed in the 1985-1986 time frame and went into production in 1986. Due to recent interest in Peripheral Technology products this board is available in assembled form.

Product Summary



Standard Address Map

Address map can be modified by jumpers

0000-DFFF    RAM

E000-E001    ACIA

E002=E003    ACIA

E004-E005    ACIA

E006-E007    ACIA

E008-E00F    Western Digital HDO hard drive port

E010-E013    PIA

E014               Floppy Drive Select Register

E0018-E01B    WD2797 Floppy Controller


Floppy Emulator

There is now support for FLEX and  OS9 with the GoTek floppy emulator with flash floppy firmware update,  The GoTek uses USB sticks to store floppy images and could contain thousands of floppy images on a single USB stick. This allows users to download DSK image files from the FLEX users group and with a newly released utility convert these image files to  .IMA format used by the modified GoTek unit.  The firmware is free and the software to reflash the GoTek is also free.  You will however need a USB to TTL serial cable and a PC to reflash the firmware in the GoTek.  Once modified, future firmware upgrades can be installed from a USB stick.  For those not wishing to modify the GoTek, we will provide modified GoTek's ready to use, but these will be ordered and modified after your order and of course are not warranted since reflashing the firmware on the GoTek will void it's warranty. You should consider the OLED modification mandatory, since it is almost impossible to tell which image file you have selected without it.

The instructions for flashing the firmware and adding the OLED can be found here -

Hard Drive Support

Hard drive support consists of a converter board that adapts the WD1002HDO interface to IDE pins outs.  The suggested drive is an SD memory card to IDE adapter and use of a 32GB SD memory card.  The boot ROM for both FLEX and OS9 has been modified to boot from the SD memory card.  There is a package available that contains the HDOIDE board, an SD memory to IDE card, a cable, and a 32GB memory card with FLEX and OS9 preloaded and ready to boot. Current version of Boot ROM is V1.5.  The upgrade to the driver includes converting the 80's drivers to LBA mode (Logical Block Access). This is where sectors are accessed by sector number and there is no need to convert to cylinder, head number, and track number.  This calculation can be complex and takes more time to calculate than the time it takes to transfer the entire sector.  This makes the updated driver very fast and significantly reduces the complexity and size of it.

This is a simple system  to install. Plug the HDOIDE into the SD memory card and then plug a 40 conductor cable between the HDOIDE adapter and the PT69-5.  Connect power to the SD memory card. Be sure to use Boot ROM V1.5 or newer.  V1.5 ships with a PT69-5 and the bare board with EPROM.  Version 1.5 ROMS have an identifying sticker on them.

This replacement for mechanical hard drives is faster than any of the 80's vintage MFM drives connected to a Western Digital WD1002HDO controller board.  FLEX boots almost instantly.

The 80's method of controlling hard drives was to connect an MFM hard drive to a Western Digital WD1002HDO-xx controller.  This controller was connected to the PT69-5 though a 40 conductor cable to the WD1002 controller PORT J11. MFM hard drives of the time were relatively slow and very small.  In the 80's the first hard drive systems sold by Peripheral Technology were between 5 and 8 MB in storage size and were relatively slow.  However they seemed very fast when compared with floppy transfers.  FLEX generally took a few seconds to boot compared to the apparent instant boot from an SD memory card.  These systems were support by PTMON V1.3W to V1.4 which was the last version of PTMON until V1.5 which was written in 2021.



PT69-5 Manuals and Sales Brochure

Click Here to download PT69-5 User Manual

Click Here to download PT69-5 PTMON V1.5 User Manual

Click Here for PT69-5 Sales Brochure  

PT69-5 Boot Rom

Click Here for  V1.5 Boot ROM Image for 2764 EPROM. PTMON and OS9 Boot - Supports boot from SD memory board

GoTek Utilities

Click Here  for Utility program to convert DSk to IMA format for GoTek  Used to convert .DSK images from FUFU users group

Click Here  GoTek IMG.CFG File  The configuration file you need for your GoTek to support FLEX/OS9 Formats

FLEX Boot Images for GoTek

Click Here  for FLEX boot disk in IMA format for GoTek   Does not support IDE Updated 6/19/21  Added Set6818 utility with Y2K Fix

Click Here  for FLEX boot for IDE/Floppy IMA format for GoTek  This disk supports IDE/Floppy - Requires PTMON V1.5

FLEX User Manuals

FLEX 6809 User's Manual.pdf  FLEX 9 User's Manual

FLEX 6809 Advanced Programming Manual.PDF  You need this if you want to write programs

ASMB6809.PDF FLEX 6809 Assembler Manual

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Price List Hardware

PT69-5-Bare Bare PT69-5 Board $25
PT69-5-Bare+EPROM Bare PT69-5 Board,  2764 EPROM with boot for FLEX or OS9. Selection is by a SHUNT or optional switch. Boot ROM Version 1.5 $35
PT69-5 Assembled Assembled and Tested PT69-5. Complete with all chips, memory, floppy controller, Boot Eprom for FLEX and OS9. Selected by jumper or optional switch, Boot ROM V1.5 $120
PT60-5A-Bare Bare PT69-5A - Has IDE interface, does not require IDE to HDO converter for Hard Drive/SD memory $50
PT69-5A-Assembled Assembled PT69-5A  board $175
PTMON/OS9 BOOT ROM 2764 Version 1.5 supports booting from SD memory board $10
PT69HD-32GB 32GB SD memory card, SD to IDE board, IDE to HDO, cable to connect to PT69-5  (Add $10 for V1.5 Boot ROM) $50/$60
GoTek GoTek with Flash Floppy firmware installed and OLED display $60

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