Search found 711 matches

by martyn_hill
Sat Aug 06, 2022 2:57 pm
Forum: General QL Chat
Topic: Andy Pennell's books.
Replies: 93
Views: 9205

Re: Andy Pennell's books.

Thank you, for all your efforts, Derek!
by martyn_hill
Fri Jul 29, 2022 2:07 pm
Forum: Help for New Users
Topic: Problems with/after ROM replacement, vDrive and Exapanderam
Replies: 26
Views: 1065

Re: Problems with/after ROM replacement, vDrive and Exapanderam

Hi Andy! Question: Could anybody suggest an expert to take a look at my computer who is close to my neck of the woods on the continent (Slovenia)? I wouldn't claim to be an 'expert', but I will be in and around Trieste in N Italy over the next few weeks visiting family - if you think I could help, f...
by martyn_hill
Fri Jul 22, 2022 6:31 pm
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 415
Views: 140871

Re: Happy Birthday!

Thank you gentlemen!

51 years on the planet - this time-round, at least :-)
by martyn_hill
Thu Jun 23, 2022 4:56 pm
Forum: Hardware
Topic: DIY RAM EXPANSION
Replies: 113
Views: 48535

Re: DIY RAM EXPANSION

Hi Chris! Looks great :-) As for a 'disable' feature, I have done this before (for a very different RAM Expansion design) by allocating a pin on the GAL for the purpose and adjusting the decoding logic to take account of the state of this input. Happy to share my (far inferior) design via PM, should...
by martyn_hill
Tue Jun 21, 2022 4:25 pm
Forum: Hardware
Topic: Microdrives not working and now neither oqtadrive
Replies: 18
Views: 1362

Re: Microdrives not working and now neither oqtadrive

Hi again Ernesto A couple of points/questions... 1. The schematic for the Iss 6 is perfectly valid for the Iss 7 boards, in so far as the MDV circuitry is concerned - as far as I can tell, the Iss 7 has a slight rearrangement of the components plus some previously documented Iss 6 mods being applied...
by martyn_hill
Mon Jun 20, 2022 10:55 am
Forum: Hardware
Topic: Q68 Order Process
Replies: 266
Views: 82480

Re: Q68 Order Process

Hi Derek!

Should your proposal come to fruition, I for one would happily purchase a pair of new cases first r my 2 Q68's... :-)
by martyn_hill
Sun Jun 19, 2022 3:34 pm
Forum: Hardware
Topic: Microdrives not working and now neither oqtadrive
Replies: 18
Views: 1362

Re: Microdrives not working and now neither oqtadrive

Hi Ernesto! I can confirm the advice below - Pins 19 & 21 of the ZX8320 are the RAW2 & RAW1 (respectively) data-lines connecting the 8302 to the MDV ULA(s) of the drive units themselves. They must both connect cleanly with the socket. The flying resistors soldered directly to these pins, and...
by martyn_hill
Mon Jun 13, 2022 11:56 am
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 415
Views: 140871

Re: Happy Birthday!

Happy Birthday, Jan!
by martyn_hill
Tue May 17, 2022 9:43 pm
Forum: Software & Programming
Topic: Rom Diagram
Replies: 6
Views: 868

Re: Rom Diagram

Hi Ruptor! More like I expect too much coming from the medical equipment design side of the industry where everything is documented. Thanks I will take a look at your suggested documentation. It just seems alien to me especially after all these years that a process chart hasn't been created by someo...
by martyn_hill
Tue May 17, 2022 4:43 pm
Forum: Software & Programming
Topic: Rom Diagram
Replies: 6
Views: 868

Re: Rom Diagram

Hi Ruptor Just to piggy-back on Norman's reply, QDOS was never designed to be called from discrete code-entry points, except for the Vectored utilities which are well documented and, unlike, say the Spectrum ROM, which only ever had 1 production variant, and which came to be well-known by the buddin...