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#112111 - 01/08/18 11:05 PM Re: Triumph-Adler alphatronic P3 (+ P1, P2 and P4) [Re: rfka01]  
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Posts: 837
Bavaria
The cursor looks great now, and thanks for catching my copy/paste error.

Here (and on the FTP) is an archive of P2 disks: https://mega.nz/#!yB5TCbJZ!mBRDCXFVOQNKRT5-UVIfbxbehJC1RSo1EmcKP8x6AwA

It looks as if the P2's have problems with the disk ready signal - formatting the disk in drive 1 just hangs, whereas trying to format in drive 2 explicitly mentions a drive that is not ready.

[Linked Image]

[Linked Image]

To replicate this situation, insert the disk "P2_ssdd_basic_foko_disk_util.IMD" from the archive, boot the FOKO disk utility by entering "B1" at the MOS prompt and try to format a disk in either drive 1 or 2.

All dev folks, thanks for your patience and expertise!


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
#112112 - 01/09/18 07:11 AM Re: Triumph-Adler alphatronic P3 (+ P1, P2 and P4) [Re: rfka01]  
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rfka01  Online Content
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Bavaria
A quick addendum to the HSYNC/VSYNC used in the P2:

helwie44 measured them off his P2U using a port extender and logic analyser:

[Linked Image]

[Linked Image]

He writes: "Here is the original 15.15 kHz HSYNC to the 8085, i.e. there's an interrupt from the CRT to the CPU every 66┬Ás. But in reality those interrupts are being processed only when needed on the P2 - a mask opens the RST55 e.g. in case a scroll is needed".

He's outlined the mechanism in handwritten notes which I've uploaded here and on the FTP.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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