Apple-2-HW/micro-sci-a2-controller
1
0
Fork 0
mirror of https://codeberg.org/cryu/micro-sci-a2-controller synced 2024-11-22 01:31:27 +00:00
Code Issues Packages Projects Releases Wiki Activity
40 Commits 4 Branches 2 Tags 54 MiB
Assembly 91%
C 5.6%
Makefile 3.4%
4e5cc8e495
Go to file
Christopher Ryu 4e5cc8e495 Merge pull request 'Update jumper documentation.' (#2) from 2716 into main 
Reviewed-on: https://codeberg.org/cryu/micro-sci-a2-controller/pulls/2
2023-07-18 06:35:19 +00:00
apple2-bus.pretty
doc
firmware Add firmware builder. 2023-07-16 11:28:35 +09:00
production
.gitignore Ignore another file. 2023-07-17 08:33:56 +09:00
apple2.kicad_sym
eprom.kicad_sym Switch to 2716/2732. 2023-07-16 11:48:36 +09:00
fp-lib-table
LICENSE
MicroSci Floppy Controller.kicad_pcb Align resistor and tighten tracks. 2023-07-18 15:22:26 +09:00
MicroSci Floppy Controller.kicad_pro Align resistor and tighten tracks. 2023-07-18 15:22:26 +09:00
MicroSci Floppy Controller.kicad_sch Align resistor and tighten tracks. 2023-07-18 15:22:26 +09:00
README.md Update jumper documentation. 2023-07-18 15:31:29 +09:00
sym-lib-table Switch to 2716/2732. 2023-07-16 11:48:36 +09:00
TTL.kicad_sym
usci.png Re-render. 2023-07-18 15:22:17 +09:00

README.md

micro-sci-a2-controller

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)

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.

usci

EPROM bank select switches (J4)

  • 1:off 2:off - controller test firmware (0x0000)
  • 1:off 2: on - 16-sector firmware (0x0100)
  • 1: on 2:off - 13-sector firmware (0x0200)
  • 1: on 2: on - firmware "put jumpers here" splash screen (0x0300)