From fd0e684ce407ed84a7d377e50927cdbaeae84a4e Mon Sep 17 00:00:00 2001 From: Christopher Kobayashi Date: Mon, 20 Apr 2020 09:47:33 +0900 Subject: [PATCH] Expand with more construction/operation details. --- README.md | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index fa36bb8..5e1a7b1 100644 --- a/README.md +++ b/README.md @@ -1,21 +1,31 @@ # Macintosh Classic II FPU / ROM board -Design by Joshua Ryan (<360alaska@gmail.com>) +Designed by Joshua Ryan (<360alaska@gmail.com>) and Paralel. Pre-built boards can be purchased from Joshua at https://www.ebay.com/usr/alaska360?_trksid=p2047675.l2559 + +## Operation + +The FPU can be any 68-pin PLCC M68882. If you are using a 40MHz chip, you must move the "Clock Select" jumper to "C". + +ROM image operation is documented at http://www.synack.net/~bbraun/classic2.html + +Although the original thread has been purged from 68kmla, it has been archived at https://web.archive.org/web/20170707023942/https://68kmla.org/forums/index.php?/topic/23149-classic-ii-fpurom-card/ ## Parts list -All capacitors are 0.1µF non-polarized. Ceramic or tantalum, your choice. +All capacitors are 0.1µF non-polarized ... except for a single 4.7µF polarized as marked on the board. The FPU socket is a 68-pin PLCC, Mouser #517-8468-11B1-RK-TP or similar. -The board connector is a TE Connectivity 2x25-pin DIP, Mouser #571-5-532955-8 or similar. +The board connector is an AMP 532955-8, Mouser #571-5-532955-8 or similar. . The oscillator is a 40MHz standard oscillator, Mouser #520-2200B-400 or similar. +The ROM can be either a MC27160 (2MiB) or M27C322 (4MiB) + ## Circuit board fabrication details v4.9 is a four-layer board. The .pcb file is a DesignSpark board file. -The .zip file contains the Gerbers for PCB fabriation. These work as-is with PCBway. +The .zip file contains the Gerbers for PCB fabrication. These work as-is with PCBway.