Shared Projects by The_Little_Engineers

2732 <–> 2532 Adapter Board: GCC-ECS-0001.1, 2532 <===> 2732 Socket Converter, Original Part Number: GCC-ECS-0001.0, Copyright © 04 May 2010, By: “Little” John Eric Turner and “Big” John Robert Turner, All Rights Reserved. http://www.GIMEchip.com/ Updated Part Number: GCC-ECS-0001.1, By: “Uncle” Robert “The R.A.T.” Allen Turner at the behest of “Little” and “Big” John, Copyright © 09 April 2019, Released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License https://creativecommons.org/licenses/by-sa/4.0/

This product is intended to allow a 2732 EPROM to be placed into a 2532 EPROM socket or a 2532 EPROM to be placed into a 2732 EPROM socket. Fitting I.C. pins for IC1 and a socket for IC2 allows a 2732 to be plugged into a 2532 socket, whilst fitting I.C. pins for IC2 and a socket for IC1 allows a 2532 to be plugged into a 2732 socket. It is recommended that “round pin headers” be used for the I.C. pins as they will plug directly into standard I.C. sockets without stressing them which would result in potential damage to the socket. A low-profile ZIF (Zero Insertion Force) socket is ideal for use as the actual socket for this device if repeated E.P.R.O.M. insertion and removal is expected. Otherwise, a low profile D.I.P. (Dual Inline Pin) socket should be used. The 2732 has an output enable signal in addition to the chip enable signal. In most cases, the output enable signal can simply be connected to ground. However, it may sometimes be desirable to connect the ouput enable signal to the chip enable signal. Jumpers JP1 and JP2 allow these settings. If JP1 is fitted, then the ouput enable will be connected to the chip enable. If JP2 is fitted, then the ouput enable will be connected to GND. JP1 and JP2 should NEVER be fitted at the same time - one or the other, but not both. In most cases, fitting JP2 will suffice. All of GIMEchip.com’s designs are created for the benefit of the vintage computing community as a whole. Although we copyright all of our works and retain all rights to them, we also don’t mind sharing. If you wish to produce and distribute this product, please contact us at: [email protected]. In most cases, permissions will be granted Royalty Free. I said we like to share, didn’t I? As of 09 April 2019, it is no longer neccessary to request permissions to use this product. This is due to the release of Version 0001.0 and the NEW Version 0001.1 under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License. This allows for almost any use, including commercial. https://creativecommons.org/licenses/by-sa/4.0/

If you would like to include this product as part of your website, feel free to do so, as long as all documentation remains intact. We do ask that you inform us that you have included this file on your site so our ego’s may get a bit larger :-) Enjoy - “Little” John Eric and “Big” John Robert Turner, Son and Father. NOTE: Due to the new licensing (CC BY-SA 4.0), it is now allowable to alter the documentation and there is no need to inform us of any website inclusion, however, attribution is still required (although we really won’t complain if you forget.) THANK YOU ! The Update to Version 0001.1 was done by: Robert Allen Turner, who acquired the GIMEchip.com domain name on 25 December 2018. Please note that Robert Allen Turner is unable to answer any inquiries in relation to GIMEchip.com prior to his acquisition of same. Robert Allen Turner is in the process of releasing all prior GIMEchip.com designs under the CC BY-SA 4.0 License. This is an ambitious undertaking which is likely to require a very large amount of time.

The Little Engineers is a project began in 2011 by Robert Allen Turner (hereafter, I or Me), for the benefit of foster children and their families (foster and biological). The original intent was simply to provide a means of creating videos with the foster families such that the biological parents did not completely miss out on their children growing up. Providing simple to construct kits seemed a logical choice as a subject for such videos and that is primarily what I attempt to develop for use in such videos. This also makes the process educational. This is a difficult undertaking, as each case must be handled on an individual basis and any such videos and communications must be scrutinized and approved on a per case basis by the case workers, et alia in charge. Although this makes such an undertaking extremely difficult, it is a neccessity in order to protect the children. Some are, after all, being protected from abusive family members and so on. So there has to be a very strict set of protocols in place. This has prevented me from fully launching The Little Engineers over the past eight years, but I remain commited to the project.

The logos, names and other material relating to The Little Engineers, TheLittleEngineers.org and GIMEchip.com are the sole property of Robert Allen Turner with All Rights Reserved. The rights to the GIMEchip.com domain and products were acquired by the author on 25 December 2018. Merry Happy Christmas! Please note that the author is unable to answer any inquiries, including those of support or otherwise, in relation to GIMEchip.com prior to his acquisition of same on 25 December 2018. http://www.TheLittleEngineers.org

github: https://github.com/TheLittleEngineers/2732-tofrom-2532

• PLEASE NOTE: THIS VERSION HAS NOT YET BEEN TESTED.

Please note: This is derived from an original design by “Little” John Eric and/or his father “Big” John Robert (J.R.) by “Uncle” Robert Allen. It should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided “as-is” with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can’t afford not to disclaim the use of this information.

CoCoDragon-8K-EPROM-Cartridge-CC1-8KEC-0001.1 - This is an 8K EPROM Cartridge for the Tandy Radio Shack TRS-80 Color Computer 1, 2, 3 and Dragon Data Dragon computers. This was one of the very first things that my nephew created when he was teaching himself electronics and computer design - it works, but could be better. He made and sold about 30 of these almost ten years ago. The design was meant to be as small as possible so as to fit entirely inside the cartridge Program Pak port and was useful for DriveWire or CoCoNet. It uses a 2764 EPROM. Updated to version 0001.1 on 5 May 2019 by “Ankle” Bob and released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License [https://creativecommons.org/licenses/by-sa/4.0/] - there is definitely a lot of room for improvement and “Little John” made many improved versions which will be shared as I get more time to do so. There is a github page for this project here: https://github.com/TheLittleEngineers/CoCoDragon-8K-EPROM-Cartridge-CC1-8KEC-0001.1

• PLEASE NOTE: THIS VERSION HAS NOT YET BEEN TESTED.

Please note: This is derived from an original design by “Little” John Eric and/or his father “Big” John Robert (J.R.) by “Uncle” Robert Allen. It should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided “as-is” with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can’t afford not to disclaim the use of this information.

TheLittleEngineers_org-CC2-32K-EPROM-CARTRIDGE-2012-Version-2-Revision-0-05.04.2019 This is an EPROM Cartridge for the Tandy Radio Shack TRS-80 Color Computer 1,2 and 3. It will probably work with the Dragon Data Dragon computers as well. It uses a 27C512 EPROM jumper selected as two 32K banks. The CoCo 1, 2 and Dragon can only access the first 16K of each bank. The CoCo 3 can access the entire 32K of each bank, minus the 0xFFnn I/O and Vector page. The project has been shared to github: https://github.com/TheLittleEngineers/CC2-32K-EPROM-CARTRIDGE-2012-V2R0. Many other similar cartridges are forthcoming. There are much better designs in my possession and I intend to post them all, in no particular order.

The project is released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License [https://creativecommons.org/licenses/by-sa/4.0/]

github: https://github.com/TheLittleEngineers/CC2-32K-EPROM-CARTRIDGE-2012-V2R0

OSHpark: https://oshpark.com/shared_projects/wl9Kmtit

• PLEASE NOTE: THIS VERSION HAS NOT YET BEEN TESTED.

Please note: This is derived from an original design by “Little” John Eric and/or his father “Big” John Robert (J.R.) by “Uncle” Robert Allen. It should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided “as-is” with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can’t afford not to disclaim the use of this information.

TheLittleEngineers_org-CC3-SpeedBump-V1R1-30-MARCH-1987 is based on an original design from 11 September 1986. This product restores the OLD high-speed POKE to the TRS80 CoCo 3. The project is on github: https://github.com/TheLittleEngineers/CC3-SpeedBump-V1R1

This product, TheLittleEngineers.org-CC3-SpeedBump-V1R1-30-MARCH-1987, is intended to add the old TRS80 Color Computer 1 and 2 High-Speed POKE back to the Tandy Color Computer 3, in hardware.

SpeedBump - A Hardware Project For The Tandy Radio Shack TRS-80 Color Computer 3 by “Ankle” Bob. This is a relatively simple project to restore, to an extent, the Color Computer 1 and 2 high-speed POKE to the Tandy Color Computer 3. Some might consider this to be a bit of folly, after all, “Doesn’t the Color Cumputer 3 possess a superior high-speed POKE?” Yes, indeed it does. However, one of the very first things that I noticed about my newly acquired CoCo 3, circa 1986, was the fact that the old high-speed POKE no longer functioned. This had the effect of rendering some of my favorite programs, such as “Paint King”, unusable, or nearly so. Now, it was a very simple matter to patch “Paint King” and similar BASIC and unprotected programs by simply substituting the new POKE for the old. In fact, this actually improved the functionality of programs such as “Paint King”. This was due to the CoCo 3 high-speed POKE NOT BEING ADDRESS DEPENDENT, as it was on the CoCo 1 and 2. Many machine-language and “protected” programs proved difficult, and in some cases, impossible to patch. After wasting many hours with a “Disk Zapper”, hacking and patching, I set about to solve the problem, once and for all, in hardware. In theory, at least, it should be quite possible and simple enough to socket the MC68B09E CPU and stick a circuit between the CPU and the rest of the system to monitor the Address Buss and pass all addresses straight through, EXCEPT for the old high/slow-speed POKE addresses. The old high/slow-speed POKE addresses would be modified (converted to the NEW high/slow-speed addresses) and passed through as the new addresses. Thanks to the amazingly versatile (at the time) PALs and PLDs of the era, this is exactly what I did. Two PLD/PALs provided an elegant two chip solution. A request from my nephew, “Little John”, prompted me, in part, to redesign the device utilizing a single 22V10 GAL. This was a desirable decision due to the scarcity of the older PLD and PAL devices and the fact that often, when purchased, the older devices have already been programmed. Being fusible link based devices, this renders them unusable and completely useless. A GAL chip is also much faster and flash-based (reusable) with some offering In System Programming (such as the ISPGAL22V10 from Lattice.) The ISP version is not used here, as they are a bit difficult to obtain, so you’ll need a GAL programmer to complete this project, or at least access to one. The g22v10d is reccommended due to its higher speed than the plain vanilla g22v10, although it should work as well. The A,B and C versions could be used as well. The CUPL code is self-explanatory and this truly is a very simple device. Note that the two old addresses are simply converted to the two new addresses. This effectively restores the old high-speed POKE with the exception that the machine will run at 1.79MHz at all times when the POKE is enabled. This is in contrast to the CoCo 1 and 2, which only ran at 1.79MHz during access to the ROM area ($8000 - $FEFF) and only if the ROMs were enabled and also at a small section of I/O addresses. It ran at .89MHz for accesses to the lower 32K (RAM area) and, if the machine were a 64K RAM machine running in All RAM mode, it would stay at .89MHz during accesses to the $8000-$FEFF area as well. In short, the old high speed POKE only functioned if the BASIC ROMs were in circuit and being executed by the CPU (using the original 74LS783/MC6883 S.A.M. - later versions of the MC6883 and the 74LS785 allowed the address dependent mode to function while in “ALL-RAM” mode as well). This version, the CC3-SpeedBump-V1R1-30-MARCH-1987 is licensed under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License: https://creativecommons.org/licenses/by-sa/4.0/

• PLEASE NOTE: THIS VERSION HAS NOT YET BEEN TESTED.

Please note: This design should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided “as-is” with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can’t afford not to disclaim the use of this information.

This product, TheLittleEngineers.org-27C512E-TO-2532S-V1R0.20.APRIL.2019, is intended to allow a 27512 or 27C512 EPROM to be placed into a TMS2532 EPROM socket. The 27512 is divided into 16 banks of 4Kbytes via the four jumpers at the bottom of the socket. https://github.com/TheLittleEngineers/27C512E-TO-2532S-V1R0

This project is licensed under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License: https://creativecommons.org/licenses/by-sa/4.0/

OshPark: https://oshpark.com/shared_projects/5EPozkYK

• PLEASE NOTE: THIS VERSION HAS NOT YET BEEN TESTED.

Please note: This is derived from an original design by “Little” John Eric and/or his father “Big” John Robert (J.R.) by “Uncle” Robert Allen. It should be thoroughly scrutinized and verified prior to actual use of any kind. DISCLAIMER: The following article is provided for informational purposes only. Any attempt to modify your computer without the proper skills to do so may void your computer. Any attempt to modify your computer without unplugging it first may void you. This Information is provided “as-is” with no guarantee of fitness for any purpose, either explicit or implied. We disclaim any and all responsibility for losses incurred through the use of this information. By using this information, you are deemed to have accepted these conditions of use, and you agree NOT to sue us. CLARIFICATION: The above disclaimer states as plainly as possible that if you decide to make use of any of the information contained within this document that you do so at your own risk. Designing hardware for the CoCo (ColorComputer) and other vintage hardware is a hobby of ours and is not motivated by any desire of profits. As this is a not for profit venture, obviously we can’t afford not to disclaim the use of this information.