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Search found 129 matches

by tetroid
Sat Sep 19, 2020 11:12 am
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 681

Re: HAL equations / JED for use in a GAL chip

Thank you Vitaliy, Not sure what value I put in there - it was a low value - but I will make sure it is 47Pf. I also need to replace my reset switch as the original QL one I've used is not playing well, they are such a poor design. What switch part did you use in your design for the reset switch? D...
by tetroid
Fri Sep 18, 2020 6:03 pm
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 681

Re: HAL equations / JED for use in a GAL chip

Thanks Marcus - I am using a 'D' variant at 15ns - I have some 'A' variants at 25ns coming my way in the next few days - I will try again. Symptoms with the D are a bit odd! 1488 chip got a bit warm - but it could be a bad one - running tests without that in place Memory detected by Minerva on powe...
by tetroid
Thu Sep 03, 2020 4:36 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8600

Re: Issue Tx boards discussions

Pr0f wrote:What is IC39 the small surface mount component under the 68008?


This is PST529C - simple reset/power-on reset
Or Russian analog - KR1171SP47
by tetroid
Sun Aug 16, 2020 8:30 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8600

Re: Issue Tx boards discussions

Two rows have parallel connection, because of different connectors have 2.54 or 5.08 mm between rows. Modern connectors - 5.08mm, but old QL connector - 2.54. This was exactly my experience too. I had to put a second row of contacts in for the same reason. How come the DRAM didn't change from 64Kx1...
by tetroid
Sun Aug 16, 2020 12:56 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8600

Re: Issue Tx boards discussions

Tesla wrote:Tetroid, It is wonderful.
New motherboard + new keyboard, will we see the new ql soon? :D


Unfortunately, we need only mass production ( big batch ) for QL case to have the resonable price. Case - last big problem.
by tetroid
Sun Aug 16, 2020 11:37 am
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8600

Re: Issue Tx boards discussions

Are there any additional signals around the ROM socket - as I've spotted 3 rows of pads, but only 2 are required for the original ROM socket? ;-) Two rows have parallel connection, because of different connectors have 2.54 or 5.08 mm between rows. Modern connectors - 5.08mm, but old QL connector - ...
by tetroid
Sat Aug 15, 2020 10:00 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8600

Re: Issue Tx boards discussions

Image
by tetroid
Sat Aug 15, 2020 9:25 pm
Forum: Hardware
Topic: QL keyboard mod
Replies: 20
Views: 1506

Re: QL keyboard mod

bixio60 wrote:
Is the Aurora clone a ready finished product ? and when do you think we could have these products?

regards

Fabrizio


I have working board.
But I haven't MACH chips firmwares.
I use chips from original Aurora, I need to return this chips.
by tetroid
Sat Aug 15, 2020 8:22 pm
Forum: Hardware
Topic: QL keyboard mod
Replies: 20
Views: 1506

Re: QL keyboard mod

Hi Tetroid, happy to read you again, your disappearance from Sellmyretro had worried me. :? Great work Tetroid. I want one too. I find very intesting the system that you had use to connect the keyboard to the QL motherboard. It looks like the solution of the old SPEM system 2. Only this single piec...
by tetroid
Sat Aug 15, 2020 8:12 pm
Forum: Hardware
Topic: QL keyboard mod
Replies: 20
Views: 1506

Re: QL keyboard mod

RalfR wrote:
Peter wrote:Absolutely great job! Will you sell this? Can german key caps be used as well?
I think, all QL are mechanical the same, it's just the ROM, which defines the keys.

BTW: Is that an Aurora board, where the "Aurora Interface" is plugged into?


Yes, I have restored Aurora board now.