EPROM Programming - Revision history

MagicFab: Added some details about combining ROMs

2022-09-04T04:54:00Z

Added some details about combining ROMs

← Older revision		Revision as of 00:54, 4 September 2022
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	Many EPROM programmers are available and when the CoCo was still available for purchase several magazines published articles to even build your own.		Many EPROM programmers are available and when the CoCo was still available for purchase several magazines published articles to even build your own.

	This guide uses the [http://www.autoelectric.cn/en/tl866_main.html USB XGecu programmer (model TL 866II PLUS)], commonly available ~~for~~ an affordable price.		This guide uses the [http://www.autoelectric.cn/en/tl866_main.html USB XGecu programmer (model TL 866II PLUS)], commonly available at an affordable price.

			You will also need an EPROM eraser, consisting of a device emitting ultraviolet light to wipe out any data on an EPROM.

	== Installing the minipro command line utility ==		== Installing the minipro command line utility ==
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	== Flashing a ROM file to an EPROM ==		== Flashing a ROM file to an EPROM ==
			=== Erasing an EPROM ===

			Erasing an EPROM requires an EPROM eraser. This process can take a few minutes. You can dump an EPROM to a file and if such a file contains only "FF" values, it's been erased.

			== Writing to an empty EPROM ==

	To flash the above EPROM with a file we can use the file we dumped before or we can use an original ROM file from the Coco 1/2, for example Extended Color Basic 1.1.		To flash the above EPROM with a file we can use the file we dumped before or we can use an original ROM file from the Coco 1/2, for example Extended Color Basic (ECB) 1.1. As its name indicates, ECB sits "on top" of Color BASIC, so their respective ROM files have to be combined into one.

	In this example we'd like to flash ECB 1.3 to the EPROM we have. For this we need to get the Color BASIC 1.3 ROM and the Extended Color BASIC 1.1 ROMs and combine them. Such ROMs can be obtained from [https://colorcomputerarchive.com/repo/ROMs/XRoar/CoCo/BASIC_OS/ the Color Computer Archive] or better yet, they can be [https://github.com/tomctomc/coco_roms compiled from TRS-80 Color Computer ROM source code]. Once you've obtained both ROMs here is an example of steps to burn the resulting ROM :		In this example we'd like to flash ECB 1.3 to the EPROM we have. For this we need to get the Color BASIC 1.3 ROM and the Extended Color BASIC 1.1 ROMs and combine them. Such ROMs can be obtained from [https://colorcomputerarchive.com/repo/ROMs/XRoar/CoCo/BASIC_OS/ the Color Computer Archive] or better yet, they can be [https://github.com/tomctomc/coco_roms compiled from TRS-80 Color Computer ROM source code]. Once you've obtained both ROMs here is an example of steps to burn the resulting ROM :

MagicFab: 1st version - final

2022-09-04T04:49:15Z

1st version - final

@@ Line 19: / Line 19: @@
 You may get a warning about outdated firmware like '''Warning : firmware is out of date'''. It's recommended to upgrade the firmware then. Check the relevant section below.
-You will then need to decide which chip you'r egoing to be flashing and find it in the [http://www.xgecu.com/MiniPro/TL866II_List.txt list of supported ICs].
+You will then need to decide which kind chip you're going to be flashing and find it in the list of supported ICs.
-In this example
+In this example we'll be using an AM27128ADC EPROM. To find its reference, we search the output of the minipro command :
 === Firmware upgrade for the TL866 plus ===

MagicFab: 1st version (WIP)

2022-09-04T02:23:00Z

1st version (WIP)

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-I don't know how many versions were made, but mine runs off a single +5 volt supply. It does not use batteries to get the programming voltage, it uses a DC-to-DC voltage contverter to generate the +12V, +21V, or +25V programming voltage. By using a DC-to-DC converter, it allows it to work on all versions of the coco. This IS compatable with the CoCo3.
+Programming (or "burning") your own ROMs for upgrade purposes requires specific software, hardware and of course ROM files to be succesful.
-repair tip: I had my DC-to-DC converter go bad (I broke it, by overloading it, it was an accident), and I simply tested the 4 transistors and replaced the bad one(s). With the price of these small signal transistors, you're probably better off to just replace all of them.
+This guide was tested and written for Ubuntu 22.04.1 LTS and Debian systems in mind.
-I will try to get a picture of mine posted before too long. Someone contact me if I forget.
+== Hardware & software ==
 [[Category:Software]]

MagicFab: MagicFab moved page EPROM Programmer to EPROM Programming: Re-write

2022-09-04T00:52:13Z

MagicFab moved page EPROM Programmer to EPROM Programming: Re-write

← Older revision	Revision as of 20:52, 3 September 2022
(No difference)

Auscoco at 04:28, 18 April 2006

2006-04-18T04:28:14Z

← Older revision		Revision as of 00:28, 18 April 2006
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	I will try to get a picture of mine posted before too long. Someone contact me if I forget.		I will try to get a picture of mine posted before too long. Someone contact me if I forget.

			[[Category:Software]]

WormFood: initial page

2005-11-11T09:06:22Z

initial page

New page

I don't know how many versions were made, but mine runs off a single +5 volt supply. It does not use batteries to get the programming voltage, it uses a DC-to-DC voltage contverter to generate the +12V, +21V, or +25V programming voltage. By using a DC-to-DC converter, it allows it to work on all versions of the coco. This IS compatable with the CoCo3.

repair tip: I had my DC-to-DC converter go bad (I broke it, by overloading it, it was an accident), and I simply tested the 4 transistors and replaced the bad one(s). With the price of these small signal transistors, you're probably better off to just replace all of them.

I will try to get a picture of mine posted before too long. Someone contact me if I forget.