Search found 41 matches
- Fri Jul 07, 2017 6:23 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
For any of you who would like to tinker with the source (it is working reasonably well, sometimes the drives get mixed up alas) I will post it here: Feel free to try it on the mbed LPC11U24 // =================================================== // QL microdrive emulator // by Gert van der Knokke (c)...
- Thu Nov 28, 2013 6:20 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
The fact that every QL has the external MD connector is also the reason why I like my device to be external giving all possibilities to re-arrange the drive numbering by a suitable driver. Only thing needed would be a command to load the driver from microdrive 3 when the internal drives are still pr...
- Tue Nov 05, 2013 6:03 pm
- Forum: Hardware
- Topic: QL network protocol
- Replies: 3
- Views: 2957
Re: QL network protocol
Ok, lots of 'food for thought'
I will look into it...
Thanks
I will look into it...
Thanks
- Mon Nov 04, 2013 8:51 pm
- Forum: Hardware
- Topic: QL network protocol
- Replies: 3
- Views: 2957
QL network protocol
Tinkering with another topic... The QL network connector. So far I found out that the data rate it is not 100 kbit/sec but 90 kbit/sec and it uses quite UART friendly 8-N-1 serial protocol. With some sniffer code on the mbed I have already deduced some of the information but since the bog-standard Q...
- Mon Sep 23, 2013 9:13 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
Playing with Eagle resulted in this design: md_emu_brd.png This board is to be put directly onto the MD connector and the microsd card will sit vertically at the righthand side underneath the edge of the QL. There are some things to add like JTAG or such, but firmware updates should be doable by uSD...
- Tue Sep 17, 2013 6:36 pm
- Forum: Software & Programming
- Topic: Metacomco (or other) assembler in MDV format
- Replies: 5
- Views: 3986
Metacomco (or other) assembler in MDV format
I am looking for a MDV image of the Metacomco Assembler for the QL
It was the only MD tape I carefully kept for years but it has died (tape damaged, pad gone).
Also is there some Linux/Dos/Win tool to generate MDV images from a bunch of files ?
It was the only MD tape I carefully kept for years but it has died (tape damaged, pad gone).
Also is there some Linux/Dos/Win tool to generate MDV images from a bunch of files ?
- Tue Sep 17, 2013 4:50 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
A small video displaying the MD emulator: QL starts, loads and runs the boot program for Quill from mdv7 and reads in a text document from mdv3 http://youtu.be/_8jUSX15Wbk I have added a reset function for the sector counter so it always starts at zero as soon as the emulated device is selected. It ...
- Tue Sep 17, 2013 8:49 am
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
Indeed: if you unplug the internal microdrives and bridge the COMMS_IN/OUT of both of them, all device numbers are available externally.Dave wrote:Are you saying no, or are you saying, yes, IF you plug a bridge into the mdv sockets on the motherboard?
- Mon Sep 16, 2013 10:41 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
Unfortunately not... mdv1 and mdv2 are internal unless the COMMS_IN and COMMS_OUT are internally bridged twice. When the internal devices are selected the outputs of their ULA's are active and trying to overrride them might/will result in 'short circuit'.. (That is why I have put two resistors in se...
- Mon Sep 16, 2013 9:59 pm
- Forum: Hardware
- Topic: Microdrive data line format
- Replies: 73
- Views: 49953
Re: Microdrive data line format
Did some serious ARM assembler coding tonight ;) Translated the cumbersome get_bit routine to ARM assembler and it now works on the LPC11U24 (the 'light' mbed), reading and writing and now even with multiple microdrive images. Mounted my test MDV1.MDV image on mdv3, ABACUS on mdv4, ARCHIVE on mdv5, ...