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Upgrading and Restoring the CoCo: Difference between revisions

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** SPI interface with 4 slaves, one connected to the micro-SD card slot
** SPI interface with 4 slaves, one connected to the micro-SD card slot
** ROM socket for 27C512 type EPROMs (64KB)
** ROM socket for 27C512 type EPROMs (64KB)
== Keyboard / Mylar replacement ==
As of Sept. 2022 two people heva made keyboard mylar kits available to replace dead or failing CoCo 1/2 or CoCo 3 keyboards :
* [https://computerconect.com/blogs/news/keyfix-mylar-keyboard-replacement?_pos=2&_sid=5d5ef6012&_ss=r Keyfix - mylar keyboard replacement kit] @ Computer Connect, by Patrick Ulland
* [https://www.facebook.com/groups/2359462640/posts/10160057655892641/?__cft__[0]=AZXrX6-KxId2x5v_DbOXE84EZmmxzAqknQ5gGYtX3lzJOpU2jtko-bXMCOfyqVBmcjdhOp9Rh5-ItiHxV-enxlAMudQ5416-cSb0Y-9j04rJeKnt7XJPLKOM7LfIC1G9CYAYYUg1JuST9gGhBjSk85AX&__tn__=%2CO%2CP-R CoCo Membrane - mylar keyboard replacement kit] - open hardware (MIT licensed) design by Mike Rojas


= CPU =
= CPU =
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= ROM =
= ROM =


Some CoCo 1/2 models only came with a Color BASIC ROM and can be upgraded to have Extended Color BASIC. Such CoCos have an empty ROM socket for 24-PIN ECB ROMs. You can either burn an EPROM yourself or buy an EPROM online. The easiest is to use a 28-PIN EPROM and a 24-to-28-PIN adapter.
* [https://www.ebay.ca/itm/154766985923 Original 24-PIN Radio Shack ECB 1.1 chip] @ eBay, sold by [https://www.ebay.ca/usr/dr.ians_junque dr.ians_junque]
* [https://thezippsterzone.com/2018/05/07/ecb-modules/ 24-28 PIN adapter module] @ Zippster Zone
* [https://store.go4retro.com/23xx-adapter/ 24-28 PIN adapter module], [https://www.go4retro.com/products/23xx-adapter/ technical documentation] @ Retro Innovations
* [http://www.frontiernet.net/~mmarlette/Cloud-9/Services/index.html EPROM burning service] @ Cloud9 Tech


= References =
= References =

Revision as of 00:40, 4 September 2022

RAM

Keyboard / Mylar replacement

As of Sept. 2022 two people heva made keyboard mylar kits available to replace dead or failing CoCo 1/2 or CoCo 3 keyboards :

  • Keyfix - mylar keyboard replacement kit @ Computer Connect, by Patrick Ulland
  • [0=AZXrX6-KxId2x5v_DbOXE84EZmmxzAqknQ5gGYtX3lzJOpU2jtko-bXMCOfyqVBmcjdhOp9Rh5-ItiHxV-enxlAMudQ5416-cSb0Y-9j04rJeKnt7XJPLKOM7LfIC1G9CYAYYUg1JuST9gGhBjSk85AX&__tn__=%2CO%2CP-R CoCo Membrane - mylar keyboard replacement kit] - open hardware (MIT licensed) design by Mike Rojas

CPU

The Hitachi 63B09E is a pin-to-pin direct replacement for the 6809E CPU found in all CoCos.

Virtually all Color Computers have their 6809 CPU soldered to the motherboard. Therefore, desoldering the CPU is necessary, and installing a socket before upgrading is recommended. If you are in doubt as to your ability to accomplish this, then do not attempt the procedure. It is very delicate and can damage your CoCo motherboard if you aren't careful.

Some distributors offer installation service.

ROM

Some CoCo 1/2 models only came with a Color BASIC ROM and can be upgraded to have Extended Color BASIC. Such CoCos have an empty ROM socket for 24-PIN ECB ROMs. You can either burn an EPROM yourself or buy an EPROM online. The easiest is to use a 28-PIN EPROM and a 24-to-28-PIN adapter.

References

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