Comments (8)
I can replicate these issues with formatting on the 3 TEAC first alternative drive models that I've modified. I've also created floppies on a real HD drive. Modified drives can read the contents of the floppy, but later get read errors. You can hear repeated re-reads, and then sometime later, it throws an read error
from amiga-hddlw.
I took the top lid off my TEAC drive and can see it struggling to format .. it stalls on a cylinder, tries it a couple times, then gives up.
Repeatable with old HD floppies and some newer, never been used Maxell HD floppies.
IMG_2642.mp4
Loaded up X-Copy to try some formatting without verification
X-Copy utility location:
https://www.retro32.com/download/x-copy-professional-1992-92-amiga-adf
X-Copy usage:
Booted in 68000 mode with .ADF in Gotek
Pressed F1 to boot X-Copy
Swapped floppy cable over to modified TEAC drive
Formatted HD floppy several times
Shutdown
Switched back to 68030 mode and booted into Workbench 3.2.2.1
I can now see the formatted volume 'Empty'
It reports an error on block 1760 and if I try to write to volume Empty, I get 'write' errors.
My guess at this point is that the difference has to do with the TEAC drives with 52pin controllers instead of 80pin controllers.
I think a compare of a scope trace captured reading a track will be my next step.
I'll capture #INDEX[8] on channel 1 and RDATA[30] on channel 2 of my drive and see what is being sent back to Paula by this modified TEAC drive.
from amiga-hddlw.
Scope testing signals:
(Using DiskSpeed utility to spin the drive motor and read the disk without moving the head)
#FDINDEX[8] is giving me a 399.2ms pulse with a HD disk
#RDATA[30] is giving 7.76us, 5.7us, 3.96us pulses
#FDINDEX[8] is giving me a 199.5ms pulse with a DD disk
#RDATA[30] is give 7.68us, 5.8us and 4.06us pulses
from amiga-hddlw.
"The INDEX signal is a short pulse which the drive delivers once per revolution of the diskette, between the start and end of a track."
So that signal is ok, since the hd floppies spin at half the regular speed.
from amiga-hddlw.
hmm i'm wondering if i missed a drive modification. maybe something to tweak the read channel to work better at the lower speed.
from amiga-hddlw.
I've tried a Sony drive, and it works great in DD, but has issues in HD mode
from amiga-hddlw.
can you capture some photos of the floppy drive's circuit board? also the exact manufacturer part number of the PAL you are using.
from amiga-hddlw.
I converted a Sony drive. Played with it on my A1000 with a Rejuvenator board. I had an old version of EMU68 on it with kickstart 3.2.1 and could not format HD floppies. Upgraded to latest release of EMU68, same kickstart/workbench combo and then I could format HD floppies without any problems. Not sure if this somehow can be transferred to a real CPU, but to me it doesnt look like it is the drive that has the problem.
from amiga-hddlw.
Related Issues (8)
- how can I use GAL instead of PAL HOT 1
- Unable to read/write hd disks HOT 4
- Another version of the TEAC FD-235HF to share with different component references HOT 3
- HDDLW .JED programming file request HOT 1
- Insulator
- Not all Teac FD235HFs are created equal (FD235HF-4240 is not suitable for this modification)
- Power connector alignment HOT 3
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from amiga-hddlw.