Search found 176 matches

by Silvester
Thu Jan 18, 2018 12:16 pm
Forum: General QL Chat
Topic: Why did Sinclair hate National Semiconductor?
Replies: 5
Views: 370

Re: Why did Sinclair hate National Semiconductor?

My old Elektor data book remarks the Hitachi 245 has Schmitt inputs, which make them suitable for noisy signals.
by Silvester
Thu Jan 11, 2018 2:16 pm
Forum: Hardware
Topic: Tetroid Disk Interface - FORMAT issue
Replies: 10
Views: 794

Re: Tetroid Disk Interface - FORMAT issue

OK, that makes sense. Err... should have qualified that, might have been seen as impolite :oops: I wasn't sure if it was a hardware problem, that it was 2.17c made sense. I've had a look and the associated MDV routines in 1.36 and 2.17 are identical. The RAM driver code is completely different, 2.1...
by Silvester
Sat Jan 06, 2018 12:20 pm
Forum: Hardware
Topic: Tetroid Disk Interface - FORMAT issue
Replies: 10
Views: 794

Re: Tetroid Disk Interface - FORMAT issue

OK, that makes sense. I have created source files from TC 1.31+ and TC2.17c so it'll be interesting to see what has changed to the RAM driver to upset FORMAT ram1_mdv1. That it at least goes through the motions is promising. Unfortunately my TC machine has long since had its microdrives removed and ...
by Silvester
Thu Jan 04, 2018 2:40 pm
Forum: Hardware
Topic: Tetroid Disk Interface - FORMAT issue
Replies: 10
Views: 794

Re: Tetroid Disk Interface - FORMAT issue

Sorry if I'm being a bit dim (I've read the above several times), but can you pin down exactly where the problem is?

Is the problem with TC 2.17c firmware (much different from earlier <=1.36).
by Silvester
Thu Nov 09, 2017 12:29 pm
Forum: Hardware
Topic: PSU alternative?
Replies: 56
Views: 8999

Re: PSU alternative?

Martin_Head wrote:On the QL circuit the +/- 12 volt regulators use the 9 volt DC line as a ground/reference?

It's an error in the original service manual circuit, it is 0V. I checked PCB when doing PDF version.
by Silvester
Mon Oct 23, 2017 3:42 pm
Forum: Hardware
Topic: Qubata Syquest
Replies: 5
Views: 650

Re: Qubata Syquest

Only works on Qubide v2 ROM/GAL ?

(My Iomega Zip 100mb drive required upgrade from v1.56 to V2.02 EPROM with new V2 GALs)
by Silvester
Wed Sep 27, 2017 2:10 pm
Forum: Hardware
Topic: QL ROM switcher
Replies: 27
Views: 2117

Re: QL ROM switcher

Sorry to be a bit negative, but I don't get it. I see it of very limited use, it could easily be so much more. What _would_ be useful would be able to switch between JS, Minerva, and still have 384K Flash left over for SMSQ/E. Removing board to reprogram?, a bit awkward for average user to update. B...
by Silvester
Wed Sep 27, 2017 2:09 pm
Forum: Hardware
Topic: Tetroid interfaces hardware info
Replies: 40
Views: 3686

Re: Tetroid interfaces hardware info

It is indeed interesting - I must admit that when I had a QubIDE I no longer booted from microdrive so would not have noticed this behaviour. I do however, seem to recall the Miracle HD disk chained properly with the Trump Card - ie win1_boot, flp1_boot, mdv1_boot, but then I might be mistaken - it...
by Silvester
Thu Sep 07, 2017 12:29 pm
Forum: Hardware
Topic: Scart to HDMI upscaler
Replies: 25
Views: 2307

Re: Scart to HDMI upscaler

HI, I am hoping they would send it as a gift and the customs would not look at it closely. But payament of the VAT is clear problem and import more than one would mean import tax and VAT. Maybe not worth the effort. Tricky situation, there are several items I would like from China at similar price ...
by Silvester
Wed Sep 06, 2017 2:16 pm
Forum: Hardware
Topic: Scart to HDMI upscaler
Replies: 25
Views: 2307

Re: Scart to HDMI upscaler

Hi, The one you have, looks like: http://www.ebay.co.uk/itm/Scart-HDMI-to-HDMI-720P-1080P-HD-Video-Converter-Monitor-Box-For-HDTV-DVD-N3/302439515378?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20140122125356%26meid%3D1df34fde0bb04552b0d5be3b36c0a41d%26pid%3D100005%26rk%3D1%26rkt%3D6%26...

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