Search found 564 matches

by martyn_hill
Thu Feb 27, 2020 12:04 am
Forum: Hardware
Topic: MDV2 Microdrive spinning slowly all the time.
Replies: 16
Views: 1399

Re: MDV2 Microdrive spinning slowly all the time.

Hi James! I've been thinking about your 'leaky' MDV 2 and taking another look at the schematic, I'm wondering about the possibility of leakage from the MDRW line that - on QL MDVs - is connected via D23 (and D22 for MDV 1) though the WP switch in a 'clever' arrangement to enforce write-protection. T...
by martyn_hill
Thu Nov 07, 2019 8:31 pm
Forum: Hardware
Topic: Q68 Extension bus questions...
Replies: 17
Views: 2525

Re: Q68 Extension bus questions...

That'd be great, Peter :-) IIRC, when I was still debugging the Q68-ND driver, I measured each access-cycle to the I/O area at around 1uS - in any case, I had to be cautious in writing the debug byte out to the port during time-critical parts of the ND driver code as it soon started to skew the deli...
by martyn_hill
Thu Nov 07, 2019 12:42 pm
Forum: Hardware
Topic: Q68 Extension bus questions...
Replies: 17
Views: 2525

Re: Q68 Extension bus questions...

Hi Derek

I concur with the male-header approach - I have made such mods to my two Q68s in order to tap-off QLNET (as well as adding a 'debug' port during development of the ND-Q68 driver.)

M.
by martyn_hill
Wed Oct 09, 2019 11:15 am
Forum: Hardware
Topic: Microdrive spinning ad infinitum...
Replies: 30
Views: 3203

Re: Microdrive spinning ad infinitum...

Hi! VP makes a good point that I hadn't considered. Have you configured the picoUSB to drive 9V in to the respective Vin connector on the motherboard, or instead 5V directly in to where the output from the main 5V linear regulator feeds the board? If the former, then aside from any residual damage f...
by martyn_hill
Sun Oct 06, 2019 9:17 pm
Forum: General QL Chat
Topic: QL Net server to back-up Spectrum files?
Replies: 24
Views: 3769

Re: QL Net server to back-up Spectrum files?

Hi Stephen Wow - you showed great determination! Your little problem has set me thinking about the whole Spectrum 'fileserver' thing... I've got some ideas that I'll put in to action in a little while. Until I can crack the NET reliability issue between a BBQL and the Spectrum, any success will rely...
by martyn_hill
Sun Oct 06, 2019 8:25 pm
Forum: Hardware
Topic: DIY QubIDE Parts list
Replies: 15
Views: 2255

Re: DIY QubIDE Parts list

Hi Tom Whilst there may be other problems (the programming of the GALs for one), it seems to me from your photo that the resistor array may be fitted back-to-front. Pin 1 of the array is typically the 'common' pin and marked with the white 'dot', should be connected to Vcc and marked on the PCB adja...
by martyn_hill
Mon Sep 30, 2019 10:36 am
Forum: General QL Chat
Topic: QL Net server to back-up Spectrum files?
Replies: 24
Views: 3769

Re: QL Net server to back-up Spectrum files?

Hi Stephen! Your current requirement poses a very interesting use-case that I have been investigating myself as a spin-off from my on-going research in to the QL NET capability. To add to what has already been suggested, here are some thoughts to get you moving... The fundamental issues to be addres...
by martyn_hill
Mon Sep 23, 2019 10:32 am
Forum: Software & Programming
Topic: Read N bytes from a channel to a memory buffer
Replies: 7
Views: 957

Re: Read N bytes from a channel to a memory buffer

Hi Andrew The underlying QDOS 'FSTRG' TRAP is designed the way you need - reading bytes from a channel, directly in to a bounded memory buffer. To access this IO Trap From SBasic, you could use DIYTK's 'QTRAP' extension (Volume T), providing '3' for the TRAP ID/Operation Key, thus: QTRAP #<input_cha...
by martyn_hill
Mon Aug 19, 2019 10:06 pm
Forum: Hardware
Topic: Microdrives dont spin or do anything
Replies: 15
Views: 2359

Re: Microdrives dont spin or do anything

Well done for persevering, Bill! Out of interest, which OS were you running when trying to format the MDV image? QDOS and Minerva have different 'tolerances' as to what constitutes a reliable result from the FORMAT command and vDrive has been configured to report a suitable number of sectors so as t...
by martyn_hill
Mon Aug 19, 2019 7:31 pm
Forum: Hardware
Topic: Microdrives dont spin or do anything
Replies: 15
Views: 2359

Re: Microdrives dont spin or do anything

Hi Bill! The fact that you can 'see' the 'VTKQL109' medium listed suggests that the vDrive is being correctly accessed - but as yet, does not recognise the SD Card. If I recall correctly from the vDrive documentation and my own experience, vDrive will present a 'pseudo' MDV image containing only a b...