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.
This commit is contained in:
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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# 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
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|
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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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@ -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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## 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
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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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* 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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## 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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