Apple-2-HW/micro-sci-a2-controller
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Merge pull request '2716' (#1) from 2716 into main

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Reviewed-on: https://codeberg.org/cryu/micro-sci-a2-controller/pulls/1
This commit is contained in:
Christopher Ryu 2023-07-18 06:27:18 +00:00
commit b139c34060
8 changed files with 46180 additions and 5647 deletions
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1
.gitignore vendored
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@ -29,3 +29,4 @@ fp-info-cache
*.xml
*.csv
*.lck

43808
MicroSci Floppy Controller.kicad_pcb
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10
MicroSci Floppy Controller.kicad_pro
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@ -55,7 +55,9 @@
"width": 0.0
}
],
"drc_exclusions": [],
"drc_exclusions": [
"text_height|60650000|69400000|d768dc85-30ba-4ddc-bd02-7ecc813bf984|00000000-0000-0000-0000-000000000000"
],
"meta": {
"version": 2
},
@ -92,11 +94,11 @@
"pth_inside_courtyard": "ignore",
"shorting_items": "error",
"silk_edge_clearance": "warning",
"silk_over_copper": "warning",
"silk_overlap": "warning",
"silk_over_copper": "ignore",
"silk_overlap": "ignore",
"skew_out_of_range": "error",
"solder_mask_bridge": "ignore",
"starved_thermal": "error",
"starved_thermal": "warning",
"text_height": "warning",
"text_thickness": "warning",
"through_hole_pad_without_hole": "error",

7745
MicroSci Floppy Controller.kicad_sch
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10
README.md
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@ -4,7 +4,15 @@ This is a clone of the Micro-SCI / Franklin floppy drive controller.
v0.1 is a direct clone, reverse-engineered from a Micro-SCI board. It was cross-checked with a Franklin-branded board, as well as the (belatedly discovered) official Franklin schematic (included in doc/service_and_schematics.pdf)
Since it is a faithful clone, it requires a 2708 EPROM (or a different EPROM with a 2708 adaptor). A board slightly revised to use a 2716/2732 is available on the 2716 git branch.
v0.2 has the following enhancements over the original design:
* the 2708 EPROM has been replaced with a more-common 2716/2732 EPROM
* decoupling capacitors have been added
* footprints for all capacitors and resistors have been modernized
* firmware EPROM bank selection jumpers replaced with a DIP switch
* obsolete MPS-U51 transistor replaced with modern equivalent
* clearly-maked calibration test points have been added
* ground pours used to increase operational stability
Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65.

252
eprom.kicad_sym Normal file
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@ -0,0 +1,252 @@
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1
sym-lib-table
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@ -2,4 +2,5 @@
(version 7)
(lib (name "apple2")(type "KiCad")(uri "${KIPRJMOD}/apple2.kicad_sym")(options "")(descr ""))
(lib (name "TTL")(type "KiCad")(uri "${KIPRJMOD}/TTL.kicad_sym")(options "")(descr ""))
(lib (name "eprom")(type "KiCad")(uri "/home/wileyc/Nextcloud/KiCAD/micro-sci-a2-controller/eprom.kicad_sym")(options "")(descr ""))
)

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usci.png
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