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  • Mike_Z's Avatar
    Yesterday, 09:20 AM
    I appreciate the ideas, but some of this stuff is over my head. Remember, I'm a guy with coal dust in my hair and fly ash in my pockets. BUT........
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 22nd, 2021, 10:00 AM
    Well.... I decided that patience is a virtue and to leave well enough alone. I may still try to format the system tracks to 2:1. Thanks for the help...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 19th, 2021, 07:44 AM
    I had not planned on diving into my software, but I find this line of thought interesting. The original CP/M is sector buffered? As apposed to this...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 18th, 2021, 12:27 PM
    I spent this morning testing different interleaves. First I tried formatting one disk to 1:1, 2:1, 3:1, 4:1, 5;1, 6;1 and 7:1. I then loaded the...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 18th, 2021, 07:29 AM
    OK, I think I got it. I really like the card analogy. For one thing, I believe that one would not use both logical and physical interleave together. ...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 17th, 2021, 04:54 PM
    OK, you are saying there is physical and logical skew or interleave? Whenever I see interleave mentioned, there is no reference to either physical or...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 17th, 2021, 04:07 PM
    OK, now I'm confused again. 1:1 means sectors are 1,2,3,4.... Then 2:1 means 1,x,2,x+1,3 or 1,3,5,7 .... 3:1 means 1,x,y,2,x+1,y+1,3 or 1,4,7,10. I...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 17th, 2021, 02:58 PM
    I didn't get a chance to look at this today. I was called down to the Kenosha machine shop. The horizontal boring bar failed. A good friend of mine...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 16th, 2021, 12:28 PM
    Doug, so that is a good reason to use physical interleave. If a sector was missed, it should be read on the next revolution. Only a 167 mSec delay....
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 16th, 2021, 12:22 PM
    Chuck, I have a Intel 8272 FDC. It reads one sector at a time and uses DMA. 128 byte sectors single side, single density. I do have a couple dozen...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 16th, 2021, 11:38 AM
    Well.... what I did was redo the physical interleave (weave, I've seen skew, whatever?) My FDC just reads the sector information and that is that?...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 16th, 2021, 10:03 AM
    Today, I was curious whether or not my CP/M 2.2 system was loading fast enough. I have a 2 track system on an 8 inch floppy. My CBIOS has a SecTran...
    46 replies | 644 view(s)
  • Mike_Z's Avatar
    February 13th, 2021, 12:01 PM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Dave, I understand the placing the EQU first is OK, they are not addressed. But if you place a DB just after the ORG 0100H statement that data will...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 13th, 2021, 11:05 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Today I've been working on a baud rate change program for my 8080 CPM machine. It has two Uarts. I ran into an assembly error called phasing. I never...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 12th, 2021, 10:32 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Well.... today my Teletype model 43 printer works on both UART ports. I have a crude baud rate program made that will change the baud rates of either...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 11th, 2021, 07:50 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Actually, I do. In this case I was confused (maybe I can blame the cold weather) by the DW label 0004H. I assumed that this initialized it, but, in...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 10th, 2021, 09:50 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Hot Dog! Give that man a Cheroot! You know I was thinking along those lines and in fact I had DDT loaded up and was watching to see if the 0004H...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 10th, 2021, 09:04 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Then to add to my confusion. I tried leaving the code as the original, but adding space for the CON$DIV$CT and AUX$DIV$CT. Not using either of them...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 10th, 2021, 08:33 AM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    Doug, the memory space for this data is just below my 2k monitor. The Monitor starts at F800H. The data is F700H to F7FFH. The data is at the end of...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 9th, 2021, 04:09 PM
    Mike_Z replied to a thread Programming in CP/M and MP/M
    I'm using the standard DRI ASM. Is there some kind of library file that can be appended? Or should I just try using some text files that can be cut...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 9th, 2021, 03:16 PM
    Mike_Z started a thread Programming in CP/M and MP/M
    I want to start be saying, I'm not a programmer. More of a amateur. Lately, I've been working on my 8080 monitor/boot and CBIOS code. They are...
    21 replies | 538 view(s)
  • Mike_Z's Avatar
    February 6th, 2021, 02:12 PM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Exactly! I still use mine. Mike
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 6th, 2021, 01:21 PM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Doug, I have just had a chance to test your HEX file. First I connected my CP/M machine to my WIN98 machine. The 300 baud worked fine, but the 110...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 6th, 2021, 07:04 AM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Thanks for the file. I'll give it a try later. There is so much to learn and so little time to do it. Besides my mind is so full of stuff that each...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 5th, 2021, 01:33 PM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Holy Cow! A little bit more complicated than I need just to get a little used 110 and 300 baud addition. I think I'll just pass on adding these two...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 5th, 2021, 12:54 PM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Today has been a day where I just can not help catching my pitchfork on my own britches. Seems my brain is just mush. No, I was not using a makefile...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 5th, 2021, 09:15 AM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Spent some time reading. Also I found that M80 created a CPVMZZ.REL file. Does the L80 linker resolve these errors? Must I have other KERMIT files on...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 5th, 2021, 08:27 AM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Well...... I made a MASM80 disk and added the CPVMZZ.ASM file to it. I tried to assemble it like this. A>M80 *=CPVMZZ.ASM This seemed to...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 5th, 2021, 06:50 AM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    Doug, I've been using your first method to make the KERM file. I hope to download the M80 files today and give it a try. Let you know how it turns...
    81 replies | 1691 view(s)
  • Mike_Z's Avatar
    February 4th, 2021, 02:21 PM
    Mike_Z replied to a thread Kermit 80 in CP/M and MP/M
    I was looking at your link and the M80 says MicroSoft instead of DRI that you mentioned. Or is the M in M80 actually Microsoft? So if I just...
    81 replies | 1691 view(s)
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About Mike_Z

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About Mike_Z
Biography:
Retired Old Steam Power Plant Engineer
Location:
Near Milwaukee Wisconsin
Interests:
Old stuff, computers, cars, furniture, houses
Occupation:
Retired

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