mirror of https://github.com/xunker/blue-gs.git
128 lines
5.5 KiB
Markdown
128 lines
5.5 KiB
Markdown
# BlueGS: Internal BlueSCSI for Apple IIgs and //e
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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 //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 auxiliary 5V source)
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* Can *provide* termination power to the SCSI bus (when powered from a 5V source such as the Game IO connector or card slot)
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* Built-in termination that is controlled with a single switch
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* Active termination ICs instead of passive termination resistors, reduces power consumption by over 2/3rds
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* Reverse current and voltage protection with overcurrent prevention for auxiliary 5V input
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* Connection for external drive activity LED
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[](images/bluegs-bp-v1.4_board_front_annotated.jpg)
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[](images/bluegs-bp-v1.4_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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* Apple Rev C SCSI and clones
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* Apple High-Speed SCSI ("Sandwich II")
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* Ramfast SCSI
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Assumed to work:
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* GSE-Reactive SCSI Card
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Untested:
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* AMR SCSI
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* Cirtech SCSI/Insyder
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* SVA Hard Disk Adapter
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The CMS SCSI II is currently confirmed **NOT** to work, though it appears to be a (card) firmware issue and not a "bug" with BlueSCSI.
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## What if my SCSI card doesn't provide termination power?
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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. Using Blue-Pill-based BlueGS board.
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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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# Can I use it on things besides the IIgs and //e?
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Yes! It's a standard BlueSCSI device and uses the standard BlueSCSI V1 firmware. In fact, the built-in DB-25 connector makes it the perfect external SCSI drive as well!
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BlueGS can be mounted internally in any computer that has an open cutout for a DB-25 connector.
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## ✅ Compatible Apple clones
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These computers *do* have rear DB-25 cutouts and so BlueGS should be able to mount properly, but are untested.
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* Franklin Ace 2000/2100/2200
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* Basis 108
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## 🚫 Apple II/II+ and similar clones
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BlueGS will function in an Apple II or II+, but you will not be able to mount it because it uses "V" shaped cutouts instead of D-Subminiature connector cutouts like the //e and IIgs have.
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Many Apple II clones use the same rear cutout design and have the same mounting limitation. **A mounting solution for these machine is planned**.
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* Franklin Ace 100/1000/1200
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* Pravetz-8
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- Includes the -8, -82, -8M, -8A, -8E, and -8C
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* Unitron (Brazil)
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* Ci Base-48 and Pineapple (Korea)
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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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[V1.4 Schematic](schematics/schematic_v1.4.pdf) (**FINAL**, recommended design)
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<details>
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<summary>Older Schematics</summary>
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[V1.3 Schematic](schematics/schematic_v1.3.pdf)
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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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</details>
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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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# 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), [Androda](https://androda.work/), 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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# License
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See [LICENSE.md](LICENSE.md).
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