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Text of the page (random words):
new tms2716 capable version of 2708 mcm6876x shield added matt s tech pages skip to content matt s tech pages menu info a crash course in using gpo telephones in the modern world common wire to board wire to wire connectors and crimp tools common jst connector types dupont and dupont connectors and how to crimp them properly pc modding crimp connectors and tools converting an ibm pc 5150 model a black 115v power supply to 230v kaypro pc exp info list of known nicam 728 encoders qic tape drive info qic tape drive models re building capstans for qic tape drives reviving a qic tape backup solution from 30 years ago specialty electrical tapes lcd controllers rova tools programmer for realtek rtd2660 rtd2662 rtd2120 lcd controllers converting a usb blaster ii clone into a rova usb tools programmer rovaedit readme using rovatool with an ftdi ft232h based board rovaedit firmware editor for r rm series lcd controllers r rm3251 r rm3451 r rm5251 and r rm5451 lcd controllers review pcb800099 rtd2660 rtd2662 based lcd controller review b nta92c nt68667 based lcd controller review projects 8od arduino form factor intel 8086 8od hardware 8od software 8od processor selection 8od running with ussr k1810bm86 8od ethernet shield 8od getting started an intel mcs 48 based dual temperature sensor an other intelligent 4 wire fan speed controller building a 10base5 thick ethernet network building an extremely high powered 1 12v lab power supply on the cheap building your own pulse to tone dtmf converter hveprom project a compact programmer for 1702a eproms an easy to build mcs 48 8748 8749 8741 8742 8048 8049 8050 8755 programmer reader an easy to build programmer for 2704 2708 tms2716 mcm68764 mcm68766 eproms 2704 2708 mcm6876x programmer shield version 1 old simple 2 wire led christmas lights controller for always on operation usb ethernet adapter with aui interface building a fridge compressor air compressor tools kiddy till a pretend till cash register app for use with real barcode scanners tdsscreencap an rs232 gpib screen capture program for the tektronix tds3000 series windows command line management tool for hp ltfs about search search for new tms2716 capable version of 2708 mcm6876x shield added december 9 2022 december 30 2022 home vintage microcontrollers new tms2716 capable version of 2708 mcm6876x shield added since i first published this project four years ago i ve received a load of feedback much of it has been incorporated into this new v2 of the design no outright defects have ever been found in the original v1 shield therefore if you have already built rest assured that there is no need to replace it the changes in v2 are either new functionality or bom optimisation i have retained software support for the v1 shield in both the firmware and host software the latest software build is required to support the v2 shield changes tms2716 support added tms2716 support has been bundled into the 2708 mode this unfortunately means the shield is now significantly more complicated with quite a few more parts than its predecessor hey ho it isn t going to cost much more but it will take more time to build as with the previous design some of the components can be omitted if tms2716 support is not required replaced vp2106 with bc327 this is something i have been asked for multiple times and one reader felt so strongly about it that he went to the trouble of re working my design to use bc327 yes i admit the vp2106 arrangement wasn t ideal and it s no argument that a pnp transistor is a more optimum solution that is how i designed it with the knowledge and experience i had at the time it worked and frankly i didn t give it a great deal of further thought in its defence no actual problem has been proven with it that i aware of vpp push pull driver when i originally developed the shield i did notice the stipulation of an ability to sink a small amount of current on vpp but in practice it didn t really seem to make any difference so i put a pull down resistor on that pin and left it i ve never seen the original shield fail to program a 2708 and i have quite a lot of them to test i cannot myself confirm of this is a material improvement however there is no question it is theoretically an improvement for whatever it is worth this has been included dedicated on board 5v supply the original design sips power from the 5v regulator on the arduino i ve not known of this to be a problem but it does get rather hot in some circumstances in this design 5 6v is needed anyhow to overcome the voltage drop of multiple blocking diodes vp3203 replaced with irf9540 vp3203 was originally selected for the main power switch because it is compact and has a respectably low rds on which this project requires i did not want to go down the road of using a pnp transistor as there are so many different types with wildly varying characteristics that i felt this was too risky not least because i know people will substitute it the first problem with my choice was that some people were trying to substitute it anyway for other more common parts like bs250 or vp2106 which do not have a sufficiently low rds on to function correctly the second problem is that it is unique and not everyone can and wants to source from outfits who stock it this had lead to an unfortunate situation where people are paying outrageous sums of money to buy them off ebay for the aforementioned reasons it is gone irf9540 is significantly more common in fact almost any to 220 p ch mosfet with a v ds 20v will work there are thousands of choices some may wish to use a pnp transistor here instead i have allowed for it but you are on your own with that 4pdt mode switch the original version of the shield had a cheap 4pdt switch it s back the original version of this board had a 4pdt mode switch instead of the rare and expensive 6pdt switch i settled on in the design which most people actually built basically i was in a hurry and needed an extra pole for the software position detection and didn t bother to try work out how to do it with a 4pdt sorry about that anyway it s back reducing the bom cost by about 5 bucks or so for dual mode versions physical dimensions incorrect the original version of the shield doesn t quite have the same dimensions as an arduino mega this has been fixed different software id the id straps are set different to the v1 shield therefore the latest firmware and host software are required to make use of it things that have been asked for that i didn t do leds i m not against the idea and i did include them on my 1702a programmer i d hoped i d be able to fit some on there this time around but once again i ran out of board space trying to accommodate all of the extra stuff for the tms2716 rs 232 removal although very few use it i personally use it both for operation and debugging and additionally some people use these things on vintage pre usb pcs with the command line host software so for that reason it s stays a special version of the shield with only 2708 support too much work sorry don t have time further details can be found on the project page posted in vintage microcontrollers vintage pc post navigation previous bprom bipolar prom pal programming service next agilent esg e4433b baseband generator repair und 2 thoughts on new tms2716 capable version of 2708 mcm6876x shield added paul says june 11 2023 at 12 09 pm hi matt thanks for the effort to publish your programmer projects i recently used your design to copy mask rom code into tms2708 eproms and successfully revived a 70s era spanish made pinball machine space gambler reply steve says september 29 2024 at 6 59 pm hi matt can the tms2716 programmer also read and program 2716 eproms reply leave a reply cancel reply your email address will not be published required fields are marked comment name email website save my name email and website in this browser for the next time i comment δ categories bits and pieces broadcast tech circuit snippets 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