Stuart

If you measure the voltages at the red/black/white wires on the PSU PCB, you should get: -- across white and black - about 9V AC -- across white and red - about 19V AC You can measure the DC output voltages on the white 4-pin connector. The voltage on each pin is written in yellow on the PCB. Measure between the GND pin (black probe) and each of the other pins in turn (red probe). Make sure the probes don't slip and short between two pins! Make sure you set your multimeter to DC Volts for these. The voltages may be around 0.2V higher than stated as there is no load on the PSU.

Looks like you're measuring between pins 1 and 3 - and pin 3 isn't connected to anything (there's no metal pin where you've got the black probe). You're just picking up 4V of crosstalk.

Is the field opposite where they grow ferrite core memory?

For sale: early CF7+ I've got an early model of the CF7+ (with parallel port) for sale. Powered from the sideport - no DC power socket or power switch. Also **NO** 32K RAM - so really only useful with a console with 32K fitted internally. I've fitted a new sideport connector as the original was pretty manky. Includes CF adaptor and 32MB CF card. Any use to anyone? PM me an offer if so. I'm in the UK so postage from me to you to be added to whatever you offer. Repeat again - does **NOT** include 32K RAM! Stuart

Doug - will send you a PM about the other boards.

Having a little clearout and self-promoting my own eBay listing ... Genuine TI TMS9995 Evaluation Board. http://www.stuartconner.me.uk/tms9995_eval_module/tms9995_eval_module.htm eBay item: 303116958824. Will post worldwide.

It generates some of the internal timing signals. You could try replacing it but you need some desoldering/soldering skills to remove it without damaging the circuit board. And it's possible that chip has damaged others, possibly damaged some traces on the circuit board, and the power supply probably needs replacing if that was smoking, and that itself might have damaged some chips ...

With respect, if you've got a smoking power supply and sparking chip on the motherboard, you're way past the point of economic or sensible repair. Time for a replacement TI from eBay, or a tested working one from a member of the community here.

Looks like potential for an Internet Browser calculator app!

No, they can't increase the voltage. If a capacitor's capacitance has fallen over the years then you're likely to have a higher ripple voltage, but it can't increase the overall voltage. Was your 8V supply measured as 13V with no cards in the PEB? The voltage will likely be higher if there is no load on the supply.

If I may be so bold, the configuration of the CRUbase jumper is something that could be documented better. There's plenty on [https://github.com/jedimatt42/tipi/wiki/crubase]to help you decide what the CRUbase should be, but nothing that I could find to help you actually relate that to which pins to jump on the connector block. Can anyone update the TIPI wiki? I'm happy to help out if need be.

If the +5V supply is too high, check Q1 (TIS93). ISTR having a PSU with an over-voltage +5V line and Q1 was the culprit (it was physically broken).

Ah, looks like I was wrong. A GAL16V8 can directly replace a PAL 12L6.

What would also be useful is for a list of the PAL types used on the various boards, and whether there is a pin-for-pin GAL replacement. Most modern (EPROM) programmers can program GALs, but very few (if any) can program PALs. For the CorComp FDC, it looks like a small adapter board will be needed to use GALs in place of the 12L6 PALs; using PALs directly (if you were able to program them) could get rather expensive if it takes several iterations to get the correct equations.

If you're happy editing the web page on the TI, what I think might work is to put the content of your page in the FAVS file in the TIPI BROWSER directory. You should be able to edit this file using the E/A Editor. Then load the browser then load the FAVS file by pressing "I" - the FAVS file is just a 'local' web page. Then back to the E/A Editor and make some more edits, and so on. When your page is complete, go back to your PC and you should be able to download the FAVS file in the TIPI web interface and get the text back out of it. Haven't tried this, but I think it might work ...

A TIPI-compatible version of my Internet Browser is now available - go here [http://www.stuartconner.me.uk/ti/ti.htm#internet_web_browser] and scroll down to the "TIPI Version" heading for specific instructions. It is considerably faster to download pages than the serial port version, and also supports the TIPI mouse.

Thanks all!

But can it load into low and high memory in the same file - or will the SAVE uility save all the memory areas between low and high memory as well?

Looks like E/A5 (Program) format only supports programs that load in a contiguous memory area - is that correct? It's no use for a program that loads portions in both low and high memory areas?

Is my LBLA / TIBUG / Disassembler cartridge any use? http://www.stuartconner.me.uk/ti/ti.htm#minimem_lbla_tibug_disassembler_cartridge

So it does! That makes things nice and easy! Just a point should anyone else read this later - when you upload the .tidisk file using the TIPI web browser you initially see the .tidisk file listed with the big red question mark. If you then click the refresh button you'll see the files have been unpacked into a new folder with the disk name and the .tidisk file has been deleted.

TIFILES files - the bane of my life! So I've now got my TIPI (thanks ArcadeShopper!). I'm trying to copy over the E/A files from a .tidisk format file. So I'm opening the .tidisk file using the Win994a Disk Manager, selecting each file in turn and selecting "Export to FIAD File". So I now have each of these files on my PC in FIAD format. I've got the TIPI web interface open and I upload the files. Some upload fine, but others have the TI logo and the red question mark on them. For example, the ASSM1 file looks OK but the ASSM2 file has the red question mark. Looking at the files on the PC using a hex editor, they both seem to have the TIFILES header on them. What am I doing wrong? Thanks!

Equations for PAL U6 attached, as far as I can work out. I think I might have the AND and OR symbols in the equations the wrong way round - they probably need a bit more work to tidy up the syntax.

Don't be! That's a huge amount of work you've done.

Yikes! They're leaving inputs floating? Definitely no connections between adjacent pins directly under the socket? Can you triple(!)-check one of the connections around the 74LS11 again when you have time, as it doesn't make sense. We have A13 coming onto the card through the PEB connector and that goes to the RAM pin 5 (A0), which is fine. It then goes to the LS11 pin 2 (1B input) which is fine. It then goes to the LS11 pin 6 (2Y output) which is NOT fine as this output will fight the A13 input coming onto the card. It then goes to the 9901 P2 and pull-down resistor, which I would expect to be driving an input somewhere.