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  • MM CP/M with 35 Mb Hard Drive?

    From Tom Lake@21:1/5 to All on Sat Apr 22 10:35:55 2023
    I have Montezuma Micro CP/M on a Tandy Model 4D. I can boot from a 15 Mb hard drive but when I try to partition and format a 35 Mb drive using Montezuma's HDRS35M.COM, the fourth partition always errors out at track 512. CP/M is limited to four
    partitions of 8 Mb each on a single hard drive so I could fit all four partitions on a 35 Mb hard drive and still have about 3 Mb left for another OS such as LS-DOS.

    Can anyone tell me what parameters I can use? The following should work but doesn't:

    HDRS35M H=ABCD F=EFGH INIT

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  • From Bob Campbell@21:1/5 to Tom Lake on Mon Apr 24 04:08:58 2023
    Tom Lake <[email protected]> wrote:
    I have Montezuma Micro CP/M on a Tandy Model 4D. I can boot from a 15 Mb
    hard drive but when I try to partition and format a 35 Mb drive using Montezuma's HDRS35M.COM, the fourth partition always errors out at track
    512. CP/M is limited to four partitions of 8 Mb each on a single hard
    drive so I could fit all four partitions on a 35 Mb hard drive and still
    have about 3 Mb left for another OS such as LS-DOS.

    Can anyone tell me what parameters I can use? The following should work but doesn't:

    HDRS35M H=ABCD F=EFGH INIT

    How many cylinders does the drive have? Does it have 2048? Does it work
    with only 3 partitions instead of 4? Perhaps the last cylinder is actually bad. Would not be surprising for a 40 year old drive.

    I have no experience at all with CP/M on a Model 4. LDOS/LS-DOS allows
    you to specify the cylinder count for each partition. Can you do that with CP/M?

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