Editing Amstrad PC2386 (section)

== Hardware ==

{| class="wikitable styled-table" style="width:70%; text-align:left;"
|+'''PC2386 main ICs (service manual p. 44)'''
! IC !! Part as listed
|-
| IC146 || AMS386 (part 176600)
|-
| IC001–009 || KM41C1000-10
|-
| IC151–153 || µPD421000LA-10, nine pieces
|-
| IC160–170 || HM6789P-30
|-
| IC156 || AMS40192, TMS72C256-20 ROS
|-
| IC157–159 || AMS40191, AMS40190, AMS40189 ROS
|-
| IC115 || MC146818P
|-
| IC120 || Z765APS
|-
| IC307 || PVGA1 video gate array
|-
| IC305 || IMSG171P-35
|-
| IC311–324 (eight) || KM41464-12
|-
| IC316 || AMS40193
|-
| IC601–607 || STK7458, MB3761M, LA6324, BA707, BA6993, AN7905F, AN7912T
|}

The ROS (BIOS) is in four ROMs, and the Paradise PVGA1 is the video controller. IC316 is the device whose pin 6 carries the VCO control voltage in Amstrad's alignment; the IC6xx parts are on the power supply board.<ref name="sm" />

The crystals are X101 1.8432&nbsp;MHz, X102 32.768&nbsp;kHz, X103 48.0&nbsp;MHz, X104 14.318&nbsp;MHz, X105 40.0&nbsp;MHz, X301 25.175&nbsp;MHz, X302 28.322&nbsp;MHz, X303 36.00&nbsp;MHz, X304 15.00&nbsp;MHz and X801 11.0&nbsp;MHz. The floppy drive is listed as an OSDA-45A.<ref name="sm" /> An owner's PC2386 has a Citizen OSDA-46 drive connected by a straight cable, with the drive set to ID 0.<ref name="vog109267">Tomek TRV, [https://www.vogons.org/viewtopic.php?t=109267 "Amstrad PC2386 floppy drive problem"], VOGONS, 3 December 2025, and the same report at the [https://forum.vcfed.org/index.php?threads/amstrad-pc2386-floppy-disk-drive-problem.1255500/ Vintage Computer Federation Forums]. Retrieved 2026-10-02. Community report: the Citizen OSDA-46 drive on a straight cable set to ID 0; other drives set to ID 0 that would not work in the PC2386.</ref>

=== Power ===

The supply has its own fan (M601), a 330&nbsp;µF 400&nbsp;V reservoir capacitor (C601), an STK7458 hybrid regulator and two optocouplers, a TLP732 (Q602) and a TLP741G (Q603).<ref name="sm" /> It is adjusted with VR604 for +5&nbsp;V and VR603 for +12&nbsp;V, and VR601 sets the primary protection.<ref name="sm" /> Amstrad allowed component-level repair of the supply and monitors, but not of the main CPU board or the drives.<ref name="sm" /> The supply schematic is page 48, hosted separately; it prints the DC voltages at the pins of the STK7458 and marks the +5&nbsp;V and +12&nbsp;V overload protection and the over-voltage protection circuits.<ref name="sm" />