Yes we really need a real qd drive to compare with it
2.8" QD Disk Emulation
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- Posts: 47
- Joined: Sun Jan 02, 2011 2:31 am
Re: 2.8" QD Disk Emulation
Idea : can you try to record/load a sample into the machine and save it to the qd files ? I will try to extract the sample to a wave file.
Re: 2.8" QD Disk Emulation
I have started testing on a S220 with a working QD. The first thing to note is that the "normal" save cycle has three stages. A read of the disk to see if its empty or not, the whole disk is read rather than just the initial "header", then a write cycle and then a read cycle to verify the data.
A fast F1 save, skips the first read of the disk and has the write followed by the read.
Both types of save fail on verification. I will trace the real QD now
A fast F1 save, skips the first read of the disk and has the write followed by the read.
Both types of save fail on verification. I will trace the real QD now
- Attachments
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- Fast Save to HxC Read and Ready signals
- Fast Save - Read and Ready.jpg (52.26 KiB) Viewed 5121 times
Re: 2.8" QD Disk Emulation
About this screen, can you show me the write gate signal ? there is maybe a pre-erase write part before the data output, this maybe important to know (write gate + write data trace)
Re: 2.8" QD Disk Emulation
Read QD, Fast Save and then a Load
- Attachments
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- Load - Ready and Read Data
- RealQD - Read Cycle.jpg (51.06 KiB) Viewed 5120 times
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- Fast Save - Ready and Write Data
- RealQD - Write Cycle.jpg (51.26 KiB) Viewed 5120 times
Re: 2.8" QD Disk Emulation
Thanks
- can you do the same capture with the write gate instead of write data ?
- What is the exact ready signal assertion time ?
Re: 2.8" QD Disk Emulation
Write Gate and Write Data trace is attached.
Ready assertion time is 4.5 seconds during the write and 4.5 seconds for the read verification.
All on Fast Saves - no checking of the disk first.
Ready assertion time is 4.5 seconds during the write and 4.5 seconds for the read verification.
All on Fast Saves - no checking of the disk first.
- Attachments
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- Fast Save- Write & Write Gate
- Fast Save - Write & Write Gate.jpg (50.6 KiB) Viewed 5116 times
Re: 2.8" QD Disk Emulation
Wait ! I see two glitches on the write gate at the beginning ?! Is it real ? Can you zoom them ?
Re: 2.8" QD Disk Emulation
Solo Syn.4 saved to these files. Bank D.
- Attachments
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- DSKA0000.zip
- (216.55 KiB) Downloaded 223 times
Re: 2.8" QD Disk Emulation
I see two glitches on the write gate at the beginning on your last capture ?! Is it real ? Can you zoom them ?
Re: 2.8" QD Disk Emulation
here is the detail of the Write Gate glitch, it happens maybe 1 in 4 times, not every time.
its not me moving the probes..
its not me moving the probes..
- Attachments
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- Detail
- RealQD - Write Gate Glitch Detail.jpg (75.01 KiB) Viewed 5111 times
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- Real QD Write Gate Glitch
- RealQD - Write Gate Glitch.jpg (70.6 KiB) Viewed 5111 times
Re: 2.8" QD Disk Emulation
This can definitively disturb the software. now i suspect that main header is not recorded (lost) i have to check if the wg filter is enabled and if it is "strong" enough.
Re: 2.8" QD Disk Emulation
I have increased the WG filter value. Try this to write to a blank 4.5 seconds QD image with the attached fw, if possible with a sample loaded into the memory. (Not tested, may fail dramatically )
Re: 2.8" QD Disk Emulation
Does not work, verify error. Sorry...Real sample bank loaded from QD then saved to HxC
Last edited by AMSynths on Tue Aug 27, 2019 4:43 pm, edited 1 time in total.
Re: 2.8" QD Disk Emulation
Please share the image.