Move details about each version to separate files.
Move future plans to separate file. Move BOM to separate file. Add more detail and pictures to v1.1.main
Matthew Nielsen
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# Bill of Materials for PowerBook adapter for BlueSCSI
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https://github.com/xunker/bluescsi_pb/BOM.md
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To assemble v1.1 the board, you will need the following components:
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## Required
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Quantity | Thing | Example Part Number
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---------|-------|--------------------
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1 | An STM32 "Blue Pill" module and a way to program it with the [BlueSCSI](https://github.com/erichelgeson/BlueSCSI) firmware |
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2 | 330 Ohm Resistor Network in SIP-10 package | Bourns 4610X-101-331
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2 | 220 Ohm Resistor Network in SIP-10 package | Bourns 4610X-101-221
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1 | MicroSD Card connector (or use SD-to-MicroSD adapter [as shown here](README.md#microsd-card-j3-and-sd-card-breakout-j7)) | Molex 104031-0811
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1 | 2x20 right-angle **2mm** header for connector J1 |
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2 | 1x2 header pins for the termination jumper connectors J4 and J5 |
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2 | Jumpers (aka jumper caps, shunts, or shorts) for J4 and J5 |
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## Optional
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Quantity | Thing
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---------|-------
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1 | 1x4 2.54mm right-angle header for debugging connector
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2 | 1x2 header pins for the power selection jumper connectors J9 and J10
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1 | 2x25 2.54 header pins for 50-pin desktop SCSI connector J8
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1 | LED for D1
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1 | Resistor (R1) for LED, any value from 330 ohms to about 1.8k ohms will work
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2 | ["low-profile" female headers](https://www.adafruit.com/product/3008) if you do not want to permanently solder the Blue Pill board
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@ -0,0 +1,35 @@
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# Future plans for PowerBook adapter for BlueSCSI
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# April 2021
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https://github.com/xunker/bluescsi_pb/FUTURE_PLANS.md
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[v1.1](v1.1) is working well so I don't expect any majour changes for a while.
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## v1.2 (possible maintenance version)
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Plans for a v1.2 (maintenance) may include:
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* Jumper to toggle the activity LED
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- So you can solder the LED and resistor, but disable it later if you prefer
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* Break out power LED
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- Provide a power LED (and a jumper toggle) breakout if an external power LED is desired
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* Replace J4 & J5 with DIP switches or a single DPDT switch
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## v2.0 (possible full redesign)
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If I continue to develop project in the future, I plan on a full redesign.
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* Use termination ICs instead of resistors
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- Lower power consumption
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- More accurate termination voltage
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- Switchable termination resistance (110-ohm or 2.5k-ohm) for short busses
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* Attach J1 & J2 via the PCB edge to make it more like how an actual hard drive connects
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* Less-expensive Micro SD card slot
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* Automatic switching between TERMPWR, MOTORPWR or USB Power
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If I want to fork the actual BlueSCSI firmware, I would like to add:
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* Separate LEDs for read and write activity
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* Read TERMPWR and MOTORPWR voltages and report them on the debugging connector
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* LEDs to indicate with SCSI ID is being accessed
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* Support OLED debugging display
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114
README.md
114
README.md
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@ -7,25 +7,19 @@
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- [About](#about)
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- [Compatibility](#compatibility)
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- [Board Versions and Gerber Files](#board-versions-and-gerber-files)
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- [version 1.1 April 2021 - current](#version-11-april-2021---current)
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- [version 1.0 March 2021 - not recommended, modify before using](#version-10-march-2021---not-recommended-modify-before-using)
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- [Future Plans](#future-plans)
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- [v1.2 possible maintenance version](#v12-possible-maintenance-version)
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- [v2.0 possible full redesign](#v20-possible-full-redesign)
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- [Future versions of the board](#future-versions-of-the-board)
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- [Board Tour](#board-tour)
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- [J1 40-pin mobile SCSI connector](#j1-40-pin-mobile-scsi-connector)
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- [J2 8-pin connector](#j2-8-pin-connector)
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- [J8 50-pin desktop SCSI connector](#j8-50-pin-desktop-scsi-connector)
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- [Termination Resistors Packs and Termination Enable Jumpers J4, J5](#termination-resistors-packs-and-termination-enable-jumpers-j4-j5)
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- [MicroSD card J3 and SD Card Breakout J7](#microsd-card-j3-and-sd-card-breakout-j7)
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- [Power selection jumpers v1.1+ only](#power-selection-jumpers-v11-only)
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- [Power selection jumpers](#power-selection-jumpers)
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- [Powering board by motor power MOTORPWR](#powering-board-by-motor-power-motorpwr)
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- [Repowering board by termination power TERMPWR](#repowering-board-by-termination-power-termpwr)
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- [Powering board by USB alone](#powering-board-by-usb-alone)
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- [Activity LED D1 v1.1+ only](#activity-led-d1-v11-only)
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- [Activity LED D1](#activity-led-d1)
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- [Bill of Materials](#bill-of-materials)
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- [Required](#required)
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- [Optional](#optional)
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- [Caveats](#caveats)
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- [Termination](#termination)
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- [Ribbon cable should not be seated fully on connector J1 for me, at least](#ribbon-cable-should-not-be-seated-fully-on-connector-j1-for-me-at-least)
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@ -52,78 +46,16 @@ Using the 50-pin connector, I have successfully used it with an Apple IIgs, a Ma
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# Board Versions and Gerber Files
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## [version 1.1](v1.1/) (April 2021) - current
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Changes in order of importance:
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* Mounting hole locations adjusted so they match an actual drive
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* Connect `RETURN` on 40-pin SCSI connector with signal ground
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* STM32 +5 is connected to `TERMPWR` by default, via breakable jumper pad
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* Separate jumpers provided for powering via `TERMPWR` or `MOTORPWR`
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- *MOTORPWR* is a separate +5v provided to run the drive motor and actuator
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- This change will be helpful for debugging power issues where *MOTORPWR* appears to be inconsistent
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* Activity LED (`LED_BUILTIN`) broken-out if you want to have an external LED
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* Increased `TERMPWR` trace width
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* Traces and resistor packs are moved farther away from mounting holes to avoid potential shorts
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* Back silkscreen marks location of the key pin (17) within the 40-pin connector
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* Moved legends for J1, J2 and J8 so they are next to pin 1 on their respective connectors
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* Corners rounded more
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* Shorten board by about 5mm
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- This is the shortest practical length to maintain all four screw holes
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* Numerous changes to the routing of traces
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* [version 1.1](v1.1/) (April 2021) - current
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* [version 1.0](v1.0/) (March 2021) - deprecated, not recommended
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## [version 1.0](v1.0/) (March 2021) - not recommended, modify before using
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## Future versions of the board
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First version. 50-pin-SCSI, termination and SD card worked first time, right out of the gate. However, problems:
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See [FUTURE_PLANS.md](FUTURE_PLANS.md).
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* The screw holes are slightly too far in from edges
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* `RETURN` lines are not connected to signal ground
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* Can only power STM32 from `MOTORPWR` *or* USB, no option to power it from from `TERMPWR` alone
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* No option to disconnect STM32 from *both* `TERMPWR` and `MOTORPWR` power and use USB power alone without backfeeding
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If you choose to use this board design, please do the following:
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* break the `MOTORPWR` trace, as seen in [this image](images/j2.jpg)
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* Solder a wire from any ground pin to one of the `RETURN` pins (number 3, 4, 37 or 38) of `J1`. These are 1 column in from each edge, and and connected together. They are next to the `MOTORPWR` pins, the trace you broke above.
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* Ensure J9 ("bridge +5v and term power") is always shorted/jumped
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Why the modifications? the `MOTORPWR` pins do not appear to be working the way I expect. The power was being disconnected at unexpected times and I could not see a pattern. Maybe it is a power-saving feature? Until I figure it out and update the board design, I recommend you power the device from `TERMPWR` as usual.
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# Future Plans
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v1.1 is working well so I don't expect any majour changes for a while.
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## v1.2 (possible maintenance version)
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Plans for a v1.2 (maintenance) may include:
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* Jumper to toggle the activity LED
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- So you can solder the LED and resistor, but disable it later if you prefer
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* Break out power LED
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- Provide a power LED (and a jumper toggle) breakout if an external power LED is desired
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* Replace J4 & J5 with DIP switches or a single DPDT switch
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## v2.0 (possible full redesign)
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If I continue to develop project in the future, I plan on a full redesign.
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* Use termination ICs instead of resistors
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- Lower power consumption
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- More accurate termination voltage
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- Switchable termination resistance (110-ohm or 2.5k-ohm) for short busses
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* Attach J1 & J2 via the PCB edge to make it more like how an actual hard drive connects
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* Less-expensive Micro SD card slot
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* Automatic switching between TERMPWR, MOTORPWR or USB Power
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If I want to fork the actual BlueSCSI firmware, I would like to add:
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* Separate LEDs for read and write activity
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* Read TERMPWR and MOTORPWR voltages and report them on the debugging connector
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* LEDs to indicate with SCSI ID is being accessed
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* Support OLED debugging display
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# Board Tour
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# Tour of board v1.1
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## J1 (40-pin mobile SCSI connector)
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@ -159,7 +91,7 @@ If you do not have the correct part (or don't like soldering SMD, which is total
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## Power selection jumpers (v1.1+ only)
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## Power selection jumpers
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By default the board is powered by SCSI termination power (`TERMPWR`), and is controlled by the joint JP1 (which is near J9).
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@ -186,7 +118,7 @@ If you want to power the Blue Pill module from USB power, you must:
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* Break joint **JP1** with a small knife
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* Ensure that **J9** AND **J10** are **NOT** shorted
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## Activity LED (D1) (v1.1+ only)
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## Activity LED (D1)
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@ -196,31 +128,7 @@ The signal is active-low, and current-limiting resistor for the LED is on the *p
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# Bill of Materials
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To assemble the board, you will need the following components.
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## Required
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Quantity | Thing | Example Part Number
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---------|-------|--------------------
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1 | An STM32 "Blue Pill" module and a way to program it with the [BlueSCSI](https://github.com/erichelgeson/BlueSCSI) firmware |
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2 | 330 Ohm Resistor Network in SIP-10 package | Bourns 4610X-101-331
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2 | 220 Ohm Resistor Network in SIP-10 package | Bourns 4610X-101-221
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1 | MicroSD Card connector (or use SD-to-MicroSD adapter [as shown here](#microsd-card-j3-and-sd-card-breakout-j7)) | Molex 104031-0811
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1 | 2x20 right-angle **2mm** header for connector J1 |
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2 | 1x2 header pins for the termination jumper connectors J4 and J5 |
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2 | Jumpers (aka jumper caps, shunts, or shorts) for J4 and J5 |
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## Optional
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Quantity | Thing
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---------|-------
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1 | 1x4 2.54mm right-angle header for debugging connector
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2 | 1x2 header pins for the power selection jumper connectors J9 and J10
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1 | 2x25 2.54 header pins for 50-pin desktop SCSI connector J8
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1 | LED for D1
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1 | Resistor (R1) for LED, any value from 330 ohms to about 1.8k ohms will work
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2 | ["low-profile" female headers](https://www.adafruit.com/product/3008) if you do not want to permanently solder the Blue Pill board
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See [BOM.md](BOM.md).
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# Caveats
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## Termination
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@ -0,0 +1,31 @@
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# PowerBook adapter for BlueSCSI, v1.0
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https://github.com/xunker/bluescsi_pb/v1.0
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## March 2021
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## Deprecation Notice
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This design is deprecated and should no longer be used. Please [see v1.1 instead](../v1.1).
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## Gerber files
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Gerber files can be [found here in the gerber directory](gerber).
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## Notes
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First version. 50-pin-SCSI, termination and SD card worked first time, right out of the gate. However, problems:
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* The screw holes are slightly too far in from edges
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* `RETURN` lines are not connected to signal ground
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* Can only power STM32 from `MOTORPWR` *or* USB, no option to power it from from `TERMPWR` alone
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* No option to disconnect STM32 from *both* `TERMPWR` and `MOTORPWR` power and use USB power alone without backfeeding
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If you choose to use this board design, **please do the following**:
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* break the `MOTORPWR` trace, as seen in [this image](../images/j2.jpg)
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* Solder a wire from any ground pin to one of the `RETURN` pins (number 3, 4, 37 or 38) of `J1`. These are 1 column in from each edge, and and connected together. They are next to the `MOTORPWR` pins, the trace you broke above.
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* Ensure J9 ("bridge +5v and term power") is always shorted/jumped
|
||||
|
||||
Why the modifications? the `MOTORPWR` pins do not appear to be working the way I expect. The power was being disconnected at unexpected times and I could not see a pattern. Maybe it is a power-saving feature? Until I figure it out and update the board design, I recommend you power the device from `TERMPWR` as usual.
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@ -0,0 +1,43 @@
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# PowerBook adapter for BlueSCSI, v1.1
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https://github.com/xunker/bluescsi_pb/v1.1
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## April 2021
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This design is the current design. It replaces [v1.0](../v1.0).
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## Gerber files
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Gerber files can be [found here in the gerber directory](gerber).
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||||
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## Changes from v1.0
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Changes in order of importance:
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* Mounting hole locations adjusted so they match an actual drive
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* Connect `RETURN` on 40-pin SCSI connector with signal ground
|
||||
* STM32 +5 is connected to `TERMPWR` by default, via breakable jumper pad
|
||||
* Separate jumpers provided for powering via `TERMPWR` or `MOTORPWR`
|
||||
- *MOTORPWR* is a separate +5v provided to run the drive motor and actuator
|
||||
- This change will be helpful for debugging power issues where *MOTORPWR* appears to be inconsistent
|
||||
* Activity LED (`LED_BUILTIN`) broken-out if you want to have an external LED
|
||||
* Increased `TERMPWR` trace width
|
||||
* Traces and resistor packs are moved farther away from mounting holes to avoid potential shorts
|
||||
* Back silkscreen marks location of the key pin (17) within the 40-pin connector
|
||||
* Moved legends for J1, J2 and J8 so they are next to pin 1 on their respective connectors
|
||||
* Corners rounded more
|
||||
* Numerous changes to the routing of traces
|
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* Shorten board by about 5mm
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- This is the shortest practical length to maintain all four screw holes
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||||
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## Comparison with 2.5in drive
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A 2.5 inch SCSI drive is 100mm x 70mm. This version of bluescsi_pb is 72mm x 67mm, or 77mm x 67mm once the 40-pin connector is attached.
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Binary file not shown.
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After Width: | Height: | Size: 84 KiB |
Binary file not shown.
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After Width: | Height: | Size: 309 KiB |
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