Search found 903 matches
- Tue Dec 05, 2017 4:49 pm
- Forum: Hardware
- Topic: Microdrive Unit Design
- Replies: 118
- Views: 52097
Re: Microdrive Unit Design
Thanks Big-D! Sources: Remove the MC1377 and use other video output ;) I typically use the RBGVH lines (via SCART), so I guess I can safely remove the noisy MC1377, right? Add a large electrolytic cap across +5v and GND on the 8301, two places in DRAM, 8049, and near J1 By 'large', is that in the 22...
- Tue Dec 05, 2017 11:16 am
- Forum: Hardware
- Topic: Microdrive Unit Design
- Replies: 118
- Views: 52097
Re: Microdrive Unit Design
A lot of noise is induced into the cable connecting it to the QL, but it's small compared to the signal. Hi Dave - were you referring in this line to the 2x 7-way cables connecting the MDV to the mainboard, or to the voltage reg 3-way connector? However, a lot is also induced into the head itself, ...
- Tue Dec 05, 2017 11:10 am
- Forum: Hardware
- Topic: QL ROM switcher
- Replies: 29
- Views: 15338
Re: QL ROM switcher
The external switch is a terrific idea - well done, Vitaliy!
- Tue Dec 05, 2017 11:08 am
- Forum: Hardware
- Topic: Q68 Order Process
- Replies: 344
- Views: 174508
Re: Q68 Order Process
Mine arrived safely several days before expected - carefully packaged and that case! Very professionally engineered and finished! Just need some time to play, now - thanks Peter, Derek and Wolfgang (who, I understand worked a lot on the SMSQ/E side.) In due course, I intend to explore the developmen...
- Mon Dec 04, 2017 12:23 pm
- Forum: Hardware
- Topic: Microdrive Unit Design
- Replies: 118
- Views: 52097
Re: Microdrive Unit Design
Hi Tobias That is encouraging - when I recently ordered a couple of replacement ULAs from Rich M, I was pleasantly surprised to note that they were brand-new, with 85xx batch markings - I had been expected desoldered ICs from old MDVs - silly me! Of course its not the most trivial desolder/resolder ...
- Mon Dec 04, 2017 10:49 am
- Forum: Hardware
- Topic: Microdrive Unit Design
- Replies: 118
- Views: 52097
Re: Microdrive Unit Design
Hi Tomas I have recently been able to carry out quite a range of empirical tests on a diverse set of MDV units of different vintage, ranging from the unmarked models that we have decide to term 'Iss#5', through the explicitly marked Iss#6 and Iss#7. To be honest, I have not yet found a strong correl...
- Sun Dec 03, 2017 3:45 pm
- Forum: Hardware
- Topic: Microdrive Unit Design
- Replies: 118
- Views: 52097
Re: Microdrive Unit Design
Thank you very much Charles - that clears-up the question of encoding!
- Wed Nov 29, 2017 4:51 pm
- Forum: Hardware
- Topic: ULA ZX8301 - TV Picture Capabilities
- Replies: 62
- Views: 31331
Re: ULA ZX8301 - TV Picture Capabilities
Darn - you beat me too it!
Gota love Nasta!
Gota love Nasta!
- Wed Nov 29, 2017 4:31 pm
- Forum: Hardware
- Topic: ULA ZX8301 - TV Picture Capabilities
- Replies: 62
- Views: 31331
Re: ULA ZX8301 - TV Picture Capabilities
Can't wait for the next gripping episode!
(Do we get a prize if we answer the A6 question correctly?)
(Do we get a prize if we answer the A6 question correctly?)
- Tue Nov 28, 2017 10:55 pm
- Forum: Hardware
- Topic: Q68 Order Process
- Replies: 344
- Views: 174508
Re: Q68 Order Process
Well done, Derek!