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117 lines
5.4 KiB
Markdown
117 lines
5.4 KiB
Markdown
# BlueGS: Internal BlueSCSI for Apple IIgs and Enhanced //e
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https://github.com/xunker/blue-gs
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<!-- TOC -->
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- [BlueGS: Internal BlueSCSI for Apple IIgs and Enhanced //e](#bluegs-internal-bluescsi-for-apple-iigs-and-enhanced-e)
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- [About](#about)
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- [How it works](#how-it-works)
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- [Features](#features)
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- [Compatible SCSI cards](#compatible-scsi-cards)
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- [How do I know if my card provides "termination power"? What if it doesn't?](#how-do-i-know-if-my-card-provides-termination-power-what-if-it-doesnt)
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- [Performance](#performance)
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- [Assembly](#assembly)
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- [Installation](#installation)
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- [Schematics](#schematics)
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- [EDA/Kicad and Gerber Files](#edakicad-and-gerber-files)
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- [Credits](#credits)
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- [License](#license)
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<!-- /TOC -->
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# About
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*BlueGS* is the internal hard drive your Apple IIgs and //e always *craved*.
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Using the [BlueSCSI](https://github.com/erichelgeson/BlueSCSI) SCSI drive emulator and your compatible SCSI card, you have a fully internal hard drive with accessible microSD slot while still keeping your DB-25 connector free for other peripherals.
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[](images/bluegs_v1.2_rear_installed_cropped.jpg)
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[](images/bluegs_v1.2_rear_installed_right.jpg)
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[](images/bluegs_v1.2_rear_installed_left.jpg)
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# How it works
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BlueGS connects between your SCSI card and its external DB-25 connector to give you a seamless installation. The BlueGS module itself mounts in a free DB-25 connector cutout in the rear of your IIgs or Enhanced //e.
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[](images/bluegs_v1.2_installed_overhead.jpg)
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[](images/bluegs_v1.2_installed_front.jpg)
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# Features
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* Gives your Apple IIgs or //e an internal, cable-free hard drive
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* Can be powered from SCSI termination power only (if present)
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* "Termination Power" mod is not required (when powered from the IIgs internal fan connector)
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* Can *provide* termination power to the SCSI bus (when powered from the IIgs internal fan connector)
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* Built-in termination that is controlled with a single switch
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* TI/Unitrode termination ICs instead of passive termination, reduces power consumption by over 2/3rds
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* Connection for external drive activity LED
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[](images/bluegs_v1.2_board_front_annotated.jpg)
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[](images/bluegs_v1.2_board_rear_annotated.jpg)
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# Compatible SCSI cards
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Tested:
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* [GGLabs A2SCSI](https://gglabs.us/node/2071) - a clone of the Apple Rev C SCSI card
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Untested, but expected to be compatible:
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* Apple Rev C SCSI and clones
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* Apple High-Speed SCSI ("Sandwich II")
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Unknown, but likely compatible:
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* Ramfast SCSI
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* Any SCSI card that uses has the same IDC-26/DB-25 pinout as the Apple Rev C SCSI
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If you have an SCSI card with an IDC-26/DB-25 connector that has not been tested and would be willing to test your card with BlueGS, please [contact us](https://github.com/xunker/blue-gs/issues) to arrange to have a test unit sent to you.
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## How do I know if my card provides "termination power"? What if it doesn't?
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Running BlueGS from "termination power" makes installation much easier, but not all SCSI cards have it. For more details, please check out the notes on [Powering BlueGS](POWERING_BLUE-GS.md).
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# Performance
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Using [BenchmarkD](https://www.brutaldeluxe.fr/products/apple2gs/benchmarked.html) with Apple IIgs (ROM 1, "Fast" speed), GS-RAM Plus w/ 2MB, GGLabs A2SCSI card.
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* Read
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* File: 52 KB/s
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* Block-by-block: 36 KB/s
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* With 64K buffer: 79 KB/s
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* Write (File): 37 KB/s
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# Assembly
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If you purchased BlueGS as a self-assemble kit or are using your own PCBs, please follow the instructions in the "[assembly](assembly/)" directory.
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If your BlueGS was purchased fully-assembled, please move on to the "[Installation](installation/)" section.
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# Installation
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Installation guides can be found in the "[installation](installation/)" directory.
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# Schematics
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[V1.3 Schematic](schematics/schematic_v1.3.pdf) (**non-final**, subject to change)
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[V1.2 Schematic](schematics/schematic_v1.2.pdf)
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[V1.1 Schematic](schematics/schematic_v1.1.pdf)
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# EDA/Kicad and Gerber Files
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Kicad of current design can be found in [kicad](kicad/) directory.
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Gerber files for v1.2 can be found in the [gerbers/v1.2](gerbers/v1.2) directory. **Note:** v1.2 has bugs and it not recommended for general use. V1.3 will be available shortly which will address these bugs.
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# Credits
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This project would not be possible without the work done by [ztto](https://github.com/ztto/ArdSCSino-stm32), [Tambo](https://twitter.com/h_koma2), [Eric Helgeson](https://github.com/erichelgeson/BlueSCSI), and many others.
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The "Blue Pill" footprint was originally created by [Yet-Another-Average-Joe](https://github.com/yet-another-average-joe/Kicad-STM32).
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Symbol and footprint for Molex 105162-0001 MicroSD slot created by [SnapEDA user HMantz](https://www.snapeda.com/parts/105162-0001/Molex/view-part/).
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External LED driver circuit credit to @akuker on Open Retro SCSI Discord.
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# License
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See [LICENSE.md](LICENSE.md).
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