TRS-80 Model 4P CP/M Serial Data Transfer

**gkflyer13** · January 23rd, 2021, 07:52 PM

I just bought a TRS-80 model 4P and I'd like to send programs to it from my PC. I am want to use Tera Term to send the data. I have a USB to serial cable with null modem connected to the TRS-80 running CP/M 2.2. How can I send programs over serial to my TRS-80? I want to at least send PCGET or any better way to receive files from my PC, then I'm all set.

I have more problems related to floppy drives but I will make another post later about it.

**ldkraemer** · January 24th, 2021, 06:44 AM

There are several ways you can do this much easier, than with RS-232C Transfers.

I've included my TRS-80 Definitions that are for 22DISK, cpmtools, and libdsk.

1. You can use Chuck(G)'s 22DISK Program (SYDEX) to read and write directly to your floppy's.
His software works well, and perhaps he will still let you become a REGISTERED USER.

2. You can also use cpmtools (or cpmtools built with libdsk) to read and write the files directly
to an image of the Floppy. After you have the RAW Image you will need to create a Binary
Image to recreate the Floppy.

3. There is another program named Convert that will allow you to read/write directly to the floppy,
if you have the proper CP/M definition. I've got instructions for using that package.

Code:

BEGIN TRS1  TRS-80 Model 1, Omikron CP/M - SSSD 48 tpi 5.25" - 128 x 18
INSERT 22DISK DEFINITION HERE
END

# TRS1  TRS-80 Model 1, Omikron CP/M - SSSD 48 tpi 5.25" - 128 x 18
diskdef trs1
  seclen 128
  tracks 35
  sectrk 18
  blocksize 1024
  maxdir 64
  skew 4
  boottrk 3
  os 2.2
end

# libdsk data below
[trs1]
description = TRS1  TRS-80 Model 1, Omikron CP/M - SSSD 48 tpi 5.25" - 128 x 18
cylinders = 35
heads = 1
secsize = 128
sectors = 18
secbase = 1
datarate = SD

BEGIN TRS2  TRS-80 Model 1, Bigmem CP/M - SSDD 8" - 256 x 26
INSERT 22DISK DEFINITION HERE
END

# TRS2  TRS-80 Model 1, Bigmem CP/M - SSDD 8" - 256 x 26
diskdef trs2
  seclen 256
  tracks 77
  sectrk 26
  blocksize 2048
  maxdir 64
  skew 6
  boottrk 2
  os 2.2
end

# libdsk data below
[trs2]
description = TRS2  TRS-80 Model 1, Bigmem CP/M - SSDD 8" - 256 x 26
cylinders = 77
heads = 1
secsize = 256
sectors = 26
secbase = 1
datarate = ED

BEGIN TRS3  TRS-80 Model 1, Color Power II - SSDD 48 tpi 5.25" - 256 x 18
INSERT 22DISK DEFINITION HERE
END

# TRS3  TRS-80 Model 1, Color Power II - SSDD 48 tpi 5.25" - 256 x 18
diskdef trs3
  seclen 256
  tracks 40
  sectrk 18
  blocksize 1024
  maxdir 64
  skew 1
  boottrk 2
  os 2.2
end

# libdsk data below
[trs3]
description = TRS3  TRS-80 Model 1, Color Power II - SSDD 48 tpi 5.25" - 256 x 18
cylinders = 40
heads = 1
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRS4  TRS-80 Lifeboat CP/M (256 bytes/sector) - SSDD 8" - 256 x 26
INSERT 22DISK DEFINITION HERE
END

# TRS4  TRS-80 Lifeboat CP/M (256 bytes/sector) - SSDD 8" - 256 x 26
diskdef trs4
  seclen 256
  tracks 77
  sectrk 26
  blocksize 2048
  maxdir 128
  skew 9
  boottrk 2
  os 2.2
end

# libdsk data below
[trs4]
description = TRS4  TRS-80 Lifeboat CP/M (256 bytes/sector) - SSDD 8" - 256 x 26
cylinders = 77
heads = 1
secsize = 256
sectors = 26
secbase = 1
datarate = ED

BEGIN TRS5  TRS-80, Lifeboat CP/M (1024 bytes/sector) - SSDD 8" - 1024 x 8
INSERT 22DISK DEFINITION HERE
END

# TRS5  TRS-80, Lifeboat CP/M (1024 bytes/sector) - SSDD 8" - 1024 x 8
diskdef trs5
  seclen 1024
  tracks 77
  sectrk 8
  blocksize 2048
  maxdir 128
  skew 3
  boottrk 2
  os 2.2
end

# libdsk data below
[trs5]
description = TRS5  TRS-80, Lifeboat CP/M (1024 bytes/sector) - SSDD 8" - 1024 x 8
cylinders = 77
heads = 1
secsize = 1024
sectors = 8
secbase = 1
datarate = ED

BEGIN TRS6  TRS-80, Pickles & Trout CP/M - SSDD 8" - 512 x 16
INSERT 22DISK DEFINITION HERE
END

# TRS6  TRS-80, Pickles & Trout CP/M - SSDD 8" - 512 x 16
diskdef trs6
  seclen 512
  tracks 77
  sectrk 16
  blocksize 2048
  maxdir 128
  skew 1
  boottrk 2
  os 2.2
end

# libdsk data below
[trs6]
description = TRS6  TRS-80, Pickles & Trout CP/M - SSDD 8" - 512 x 16
cylinders = 77
heads = 1
secsize = 512
sectors = 16
secbase = 1
datarate = ED

BEGIN TRS7  TRS-80, Holmes CP/M - DSDD 48 tpi 5.25" - 512 x 10
INSERT 22DISK DEFINITION HERE
END

# TRS7  TRS-80, Holmes CP/M - DSDD 48 tpi 5.25" - 512 x 10
diskdef trs7
  seclen 512
  tracks 40
  sectrk 20
  secbase 0
  blocksize 2048
  maxdir 64
  skew 1
  offset 10240
  boottrk 0
  os 2.2
end

# libdsk data below
[trs7]
description = TRS7  TRS-80, Holmes CP/M - DSDD 48 tpi 5.25" - 512 x 10
sides = extsurface
cylinders = 80
heads = 2
secsize = 512
sectors = 10
secbase = 0
datarate = DD

BEGIN TRS8  TRS-80, MM CP/M - SSDD 48 tpi 5.25" - 512 x 10
INSERT 22DISK DEFINITION HERE
END

# TRS8  TRS-80, MM CP/M - SSDD 48 tpi 5.25" - 512 x 10
diskdef trs8
  seclen 512
  tracks 40
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 1
  boottrk 2
  os 2.2
end

# libdsk data below
[trs8]
description = TRS8  TRS-80, MM CP/M - SSDD 48 tpi 5.25" - 512 x 10
cylinders = 40
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRS9  TRS-80 Model 4, 4P; MT CP/M - SSDD 48 tpi 5.25" - 256 x 18
INSERT 22DISK DEFINITION HERE
END

# TRS9  TRS-80 Model 4, 4P; MT CP/M - SSDD 48 tpi 5.25" - 256 x 18
diskdef trs9
  seclen 256
  tracks 40
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trs9]
description = TRS9  TRS-80 Model 4, 4P; MT CP/M - SSDD 48 tpi 5.25" - 256 x 18
cylinders = 40
heads = 1
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSA  TRS-80 Model 4, 4P; MT CP/M - DSDD 48 tpi 5.25" - 256 x 18
INSERT 22DISK DEFINITION HERE
END

# TRSA  TRS-80 Model 4, 4P; MT CP/M - DSDD 48 tpi 5.25" - 256 x 18
diskdef trsa
  seclen 256
  tracks 80
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsa]
description = TRSA  TRS-80 Model 4, 4P; MT CP/M - DSDD 48 tpi 5.25" - 256 x 18
sides = alt
cylinders = 80
heads = 2
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSB  TRS-80 Model 4, 4P - SSDD 48 tpi 5.25" - 512 x 8
INSERT 22DISK DEFINITION HERE
END

# TRSB  TRS-80 Model 4, 4P - SSDD 48 tpi 5.25" - 512 x 8
diskdef trsb
  seclen 512
  tracks 40
  sectrk 8
  blocksize 1024
  maxdir 64
  skew 1
  boottrk 1
  os 2.2
end

# libdsk data below
[trsb]
description = TRSB  TRS-80 Model 4, 4P - SSDD 48 tpi 5.25" - 512 x 8
cylinders = 40
heads = 1
secsize = 512
sectors = 8
secbase = 1
datarate = DD

BEGIN TRSC  TRS-80 Model 3 - Hurricane CP/M - SSDD 48 tpi 5.25" - 1024 x 5
INSERT 22DISK DEFINITION HERE
END

# TRSC  TRS-80 Model 3 - Hurricane CP/M - SSDD 48 tpi 5.25" - 1024 x 5
diskdef trsc
  seclen 1024
  tracks 40
  sectrk 5
  blocksize 2048
  maxdir 128
  skew 3
  boottrk 2
  os 2.2
end

# libdsk data below
[trsc]
description = TRSC  TRS-80 Model 3 - Hurricane CP/M - SSDD 48 tpi 5.25" - 1024 x 5
cylinders = 40
heads = 1
secsize = 1024
sectors = 5
secbase = 1
datarate = DD

BEGIN TRSD  TRS-80 Model 4P - Montezuma 800K - DSDD 96 tpi 5.25" - 512 x 10
INSERT 22DISK DEFINITION HERE
END

# TRSD  TRS-80 Model 4P - Montezuma 800K - DSDD 96 tpi 5.25" - 512 x 10
diskdef trsd
  seclen 512
  tracks 160
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsd]
description = TRSD  TRS-80 Model 4P - Montezuma 800K - DSDD 96 tpi 5.25" - 512 x 10
sides = alt
cylinders = 160
heads = 2
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSE  TRS-80 II/12/16 Aton CP/M - SSHD 8" - 1024 x 8
INSERT 22DISK DEFINITION HERE
END

# TRSE  TRS-80 II/12/16 Aton CP/M - SSHD 8" - 1024 x 8
diskdef trse
  seclen 1024
  tracks 77
  sectrk 8
  blocksize 2048
  maxdir 128
  skew 3
  boottrk 2
  os 2.2
end

# libdsk data below
[trse]
description = TRSE  TRS-80 II/12/16 Aton CP/M - SSHD 8" - 1024 x 8
cylinders = 77
heads = 1
secsize = 1024
sectors = 8
secbase = 1
datarate = ED

BEGIN TRSF  TRS-80 II/12/16 Aton CP/M  - DSHD 8" - 1024 x 8
INSERT 22DISK DEFINITION HERE
END

# TRSF  TRS-80 II/12/16 Aton CP/M  - DSHD 8" - 1024 x 8
diskdef trsf
  seclen 1024
  tracks 154
  sectrk 8
  blocksize 2048
  maxdir 192
  skew 3
  boottrk 2
  os 2.2
end

# libdsk data below
[trsf]
description = TRSF  TRS-80 II/12/16 Aton CP/M  - DSHD 8" - 1024 x 8
sides = alt
cylinders = 154
heads = 2
secsize = 1024
sectors = 8
secbase = 1
datarate = ED

BEGIN TRSG  TRS-80 II/12/16 Pickles & Trout - DSHD 8" - 512 x 16
INSERT 22DISK DEFINITION HERE
END

# TRSG  TRS-80 II/12/16 Pickles & Trout - DSHD 8" - 512 x 16
diskdef trsg
  seclen 512
  tracks 154
  sectrk 16
  blocksize 2048
  maxdir 192
  skew 1
  boottrk 2
  os 2.2
end

# libdsk data below
#ORDER CYLINDERS
#
[trsg]
description = TRSG  TRS-80 II/12/16 Pickles & Trout - DSHD 8" - 512 x 16
sides = outback
cylinders = 154
heads = 2
secsize = 512
sectors = 16
secbase = 1
datarate = ED

BEGIN TRSH  TRS-80 Model 4, Montezuma - DSDD 48 tpi 5.25" - 256 x 18
INSERT 22DISK DEFINITION HERE
END

# TRSH  TRS-80 Model 4, Montezuma - DSDD 48 tpi 5.25" - 256 x 18
diskdef trsh
  seclen 256
  tracks 80
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsh]
description = TRSH  TRS-80 Model 4, Montezuma - DSDD 48 tpi 5.25" - 256 x 18
sides = eagle
cylinders = 80
heads = 2
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSI  TRS-80 Model 4, Montezuma 170K - SSDD 48 tpi 5.25" - 256 x 18
INSERT 22DISK DEFINITION HERE
END

# TRSI  TRS-80 Model 4  Montezuma 170K - SSDD 48 tpi 5.25" - 256 x 18
diskdef trsi
  seclen 256
  tracks 40
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsi]
description = TRSI  TRS-80 Model 4  Montezuma 170K - SSDD 48 tpi 5.25" - 256 x 18
cylinders = 40
heads = 1
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSJ  TRS-80 Model 4,4P Montezuma Data 200K - SSDD 48 tpi 5.25 - 512 x 10"
INSERT 22DISK DEFINITION HERE
END

# TRSJ  TRS-80 Model 4 4P Montezuma Data 200K - SSDD 48 tpi 5.25 - 512 x 10"
diskdef trsj
  seclen 512
  tracks 40
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsj]
description = TRSJ  TRS-80 Model 4 4P Montezuma Data 200K - SSDD 48 tpi 5.25 - 512 x 10"
cylinders = 40
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSK  TRS-80 Model 4,4P Montezuma Data 400K - DSDD 48 tpi 5.25" - 512 x 10
INSERT 22DISK DEFINITION HERE
END

# TRSK  TRS-80 Model 4 4P Montezuma Data 400K - DSDD 48 tpi 5.25" - 512 x 10
diskdef trsk
  seclen 512
  tracks 80
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsk]
description = TRSK  TRS-80 Model 4 4P Montezuma Data 400K - DSDD 48 tpi 5.25" - 512 x 10
sides = eagle
cylinders = 80
heads = 2
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSL  TRS-80 Model 4,4P Montezuma System 350K - SSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSL  TRS-80 Model 4,4P Montezuma System 350K - SSDD 96 tpi 5.25"
diskdef trsl
  seclen 256
  tracks 80
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsl]
description = TRSL  TRS-80 Model 4,4P Montezuma System 350K - SSDD 96 tpi 5.25"
cylinders = 80
heads = 1
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSM  TRS-80 Model 4,4P Montezuma Data 400K - SSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSM  TRS-80 Model 4,4P Montezuma Data 400K - SSDD 96 tpi 5.25"
diskdef trsm
  seclen 512
  tracks 80
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsm]
description = TRSM  TRS-80 Model 4,4P Montezuma Data 400K - SSDD 96 tpi 5.25"
cylinders = 80
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSN  TRS-80 Model 4,4P Montezuma System 710K - DSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSN  TRS-80 Model 4,4P Montezuma System 710K - DSDD 96 tpi 5.25"
diskdef trsn
  seclen 256
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsn]
description = TRSN  TRS-80 Model 4,4P Montezuma System 710K - DSDD 96 tpi 5.25"
sides = alt
cylinders = 160
heads = 2
secsize = 256
sectors = 18
secbase = 1
datarate = DD

BEGIN TRSO  TRS-80 Model 4,4P Montezuma Data 800K - DSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSO  TRS-80 Model 4,4P Montezuma Data 800K - DSDD 96 tpi 5.25"
diskdef trso
  seclen 512
  tracks 160
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trso]
description = TRSO  TRS-80 Model 4,4P Montezuma Data 800K - DSDD 96 tpi 5.25"
sides = alt
cylinders = 160
heads = 2
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSP  TRS-80 Model 4,4P Montezuma Extend System 190K - SSDD 48 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSP  TRS-80 Model 4,4P Montezuma Extend System 190K - SSDD 48 tpi 5.25"
diskdef trsp
  seclen 512
  tracks 40
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsp]
description = TRSP  TRS-80 Model 4,4P Montezuma Extend System 190K - SSDD 48 tpi 5.25"
cylinders = 40
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSQ  TRS-80 Model 4,4P Montezuma Extend System 390K - DSDD 48 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSQ  TRS-80 Model 4,4P Montezuma Extend System 390K - DSDD 48 tpi 5.25"
diskdef trsq
  seclen 512
  tracks 80
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsq]
description = TRSQ  TRS-80 Model 4,4P Montezuma Extend System 390K - DSDD 48 tpi 5.25"
sides = alt
cylinders = 80
heads = 2
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSR  TRS-80 Model 4,4P Montezuma Extend System 390K - SSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSR  TRS-80 Model 4,4P Montezuma Extend System 390K - SSDD 96 tpi 5.25"
diskdef trsr
  seclen 512
  tracks 80
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trsr]
description = TRSR  TRS-80 Model 4,4P Montezuma Extend System 390K - SSDD 96 tpi 5.25"
cylinders = 80
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRSS  TRS-80 Model 4,4P Montezuma Extend System 790K - DSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSS  TRS-80 Model 4,4P Montezuma Extend System 790K - DSDD 96 tpi 5.25"
diskdef trss
  seclen 512
  tracks 160
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 2
  os 2.2
end

# libdsk data below
[trss]
description = TRSS  TRS-80 Model 4,4P Montezuma Extend System 790K - DSDD 96 tpi 5.25"
sides = alt
cylinders = 160
heads = 2
secsize = 512
sectors = 10
secbase = 1
datarate = DD

BEGIN TRST  TRS-80 Model 4,4P Montezuma Super Data 220K - SSDD 48 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRST  TRS-80 Model 4,4P Montezuma Super Data 220K - SSDD 48 tpi 5.25"
diskdef trst
  seclen 1024
  tracks 40
  sectrk 6
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trst]
description = TRST  TRS-80 Model 4,4P Montezuma Super Data 220K - SSDD 48 tpi 5.25"
cylinders = 40
heads = 1
secsize = 1024
sectors = 6
secbase = 1
datarate = DD

BEGIN TRSU  TRS-80 Model 4,4P Montezuma Super Data 440K - DSDD 48 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSU  TRS-80 Model 4,4P Montezuma Super Data 440K - DSDD 48 tpi 5.25"
diskdef trsu
  seclen 1024
  tracks 80
  sectrk 6
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsu]
description = TRSU  TRS-80 Model 4,4P Montezuma Super Data 440K - DSDD 48 tpi 5.25"
sides = eagle
cylinders = 80
heads = 2
secsize = 1024
sectors = 6
secbase = 1
datarate = DD

BEGIN TRSV  TRS-80 Model 4,4P Montezuma Super Data 440K - SSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSV  TRS-80 Model 4,4P Montezuma Super Data 440K - SSDD 96 tpi 5.25"
diskdef trsv
  seclen 1024
  tracks 80
  sectrk 6
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsv]
description = TRSV  TRS-80 Model 4,4P Montezuma Super Data 440K - SSDD 96 tpi 5.25"
cylinders = 80
heads = 1
secsize = 1024
sectors = 6
secbase = 1
datarate = DD

BEGIN TRSW  TRS-80 Model 4,4P Montezuma Super Data 880K - DSDD 96 tpi 5.25"
INSERT 22DISK DEFINITION HERE
END

# TRSW  TRS-80 Model 4,4P Montezuma Super Data 880K - DSDD 96 tpi 5.25"
diskdef trsw
  seclen 1024
  tracks 160
  sectrk 6
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsw]
description = TRSW  TRS-80 Model 4,4P Montezuma Super Data 880K - DSDD 96 tpi 5.25"
sides = alt
cylinders = 160
heads = 2
secsize = 1024
sectors = 6
secbase = 1
datarate = DD

BEGIN TRSX  TRS-80 Model 4,4P Montezuma System 400K - SSDD 96 tpi 3.5"
INSERT 22DISK DEFINITION HERE
END

# TRSX  TRS-80 Model 4,4P Montezuma System 400K - SSDD 96 tpi 3.5"
diskdef trsx
  seclen 512
  tracks 80
  sectrk 10
  blocksize 2048
  maxdir 128
  skew 2
  boottrk 0
  os 2.2
end

# libdsk data below
[trsx]
description = TRSX  TRS-80 Model 4,4P Montezuma System 400K - SSDD 96 tpi 3.5"
cylinders = 80
heads = 1
secsize = 512
sectors = 10
secbase = 1
datarate = DD

Will you tell us the exact name of your CP/M version? Do you know what the Floppy definition is?

If you must use serial, I've got Modem904.LBR that has a driver I created by modifying an existing
driver for the same hardware.

That should work with PCPLUS, assuming you have a real serial port on the PC.

Larry

**gkflyer13** · January 24th, 2021, 07:32 AM

Booting my TRS-80 into the CP/M disk gives me this message:

"TRS-80 Model 4 64k CP/m vers 2.2 (c) (p) 1982 Digital Research Inc.
Bios vers 2.22 (c) (p) 1984 Montezuma Micro/JBO"

Here are the settings for the floppy drives in config.

Drive A (boot drive)

Type of drive: 5 inch
Number of tracks: 40
Number of sides: 1
Step rate (ms): 30

Drive B

Type of drive: 5 inch
Number of tracks: 40
Number of sides: 1
Step rate (ms): 6

The disk is labeled "CPM operating system, montezuma" so it looks like it checks out. I hope that that might help you. I'm not familiar with any TRS-80 model and I don't have any other equipment to write to 5.25 floppies. Most of the stuff I collect is Windows 3.1/95 stuff so this is all new to me. I can't write to any 5.25 disks, which is why I want to use serial. Sorry, I should've clarified that in my first post.

**ldkraemer** · January 24th, 2021, 10:37 AM

The problem you are going to run into is the UART for the Model 4P is

Code:

U33   TR1865  UART  8040865

U73   BR1943  Clock Generator

and none of the drivers available are designed for these IC's. I've looked at MEX and IMP and Modem7 packages.

Do you happen to have a communications program on your CP/M Floppy?

Larry

**ldkraemer** · January 24th, 2021, 12:04 PM

This site:
http://oldcomputers.dyndns.org/publi...dem/index.html

has an Overlay for the TRS-80 Model 4 & 4P that has information on the Ports and Bits.

ZMO-R415.Z80 has the following:

Code:

esc	equ	1bh
ctrlq	equ	11h
cr	equ	0dh
lf	equ	0ah
bdos	equ	5


; Tandy specific equates  ***********************************************
mdata	equ	0EBh	;Modem data port
mstat	equ	0EAh	;Modem Status for BREAK,DTR,RTS
mrset	equ	0E8h	;Master Reset and Modem Status for CTS,DSR,CD,RI
brg	equ	0E9h	;Baud rate generator port BR 1943
break	equ	2	;BREAK bit 2, 0 = BREAK 1 = NO BREAK
error	equ	038h	;For bits 5,4,3 (any a 1)
dtr	equ	1	;DTR bit 1, 1=OFF, 0=ON
nstp	equ	4	;Bit 4 is No of STOP bits, 1=2 stop bits, 0=1 stop bit
paroe	equ	7	;Parity ODD/EVEN bit 7, 1=EVEN, 0=ODD  
paron	equ	3	;Parity ON/OFF bit 3, 1=OFF, 0=ON
rda	equ	7	;Bit 7 received byte available, 1=data available
rts	equ	0	;RTS bit 0, 1=OFF, 0=ON
tbe	equ	6	;Bit 6 transmit holding register empty, 1=empty
wls1	equ	6	;Word Length Select bit 6  (See explanation below)
wls2	equ	5	;Word Length Select bit 5
;Set the following two equates to the drive and user area which will contain
;   ZMP's .OVR files, .CFG file, .FON file and .HLP file. Set both to zero
;   (null) to locate them on the drive from which ZMP was invoked.
.
.
.
.
.
.
.
.port:	ds	1

brate:	dw	5		; baud rate:
parity:	dw	'N'		; parity
data:	dw	8		; data bits
stop:	dw	1		; stop bits
combyt:	db	06Ch		;To store current set-up (init val = 8,1,n)


; Values for Western Digital BR1941/BR1943, for each baud rate: 0 if invalid
;
brval:
	db	22h	;   110		0
	db	55h	;   300		1
	db	0	;   450		2
	db	66h	;   600		3
	db	0	;   710		4
	db	77h	;  1200		5
	db	0AAh	;  2400		6
	db	0CCh	;  4800		7
	db	0EEh	;  9600		8
	db	0FFh	; 19200		9
	db	0	; 38400		10
	db	0	; 57600		11
	db	0	; 76800		12

So it's possible my TR1602 Overlay for the Modem904 Program will function properly,
if you can get it to a Floppy.

Larry

**ldkraemer** · January 24th, 2021, 12:17 PM

Boot your CP/M Version and execute the following commands. Post the settings you find.

Code:

STAT DSK:
STAT A: DSK:
STAT B: DSK:

Larry

**gkflyer13** · January 24th, 2021, 02:50 PM

Here is a retyping of what I got after executing the commands:

A>STAT DSK:

A: Drive Characteristics
1360: 128 Byte Record Capacity
170: Kilobyte Drive Capacity
128: 32 byte directory entries
256: Records/ Extent
16: Record/ Block
36: Sectors/ Track
2: Reserved Tracks

A>STAT A: DSK:

A: Drive Characteristics
1360: 128 Byte Record Capacity
170: Kilobyte Drive Capacity
128: 32 byte directory entries
256: Records/ Extent
16: Record/ Block
36: Sectors/ Track
2: Reserved Tracks

There is a disk in drive B, but I don't know what it is for. Just some files I have no idea what to do with. WOMENS.BAK and WOMENS.FEL came up when reading it.

A>STAT B: DSK:

Unrecoverable error on drive B:!

(Drive B is having some issues but I hope I'll be able to fix them soon, but for now it won't read 90% of the time.)

Also, I just noticed a program on my CP/M disk: MDM730. It looks like I can use it for receiving files from my PC. Running it gives me this message:

"Version 3.1 for Tandy TRS-80 4/4P with Montezuma Micro CP/M 2.2"

There are lots of useful commands I can use listed in the menu, like "Terminal mode", which looks like a terminal emulator or "Receive/Send CP/M file using Christensen Protocol", which it sounds to me like it might be XMODEM. In the terminal emulator mode I can't seem to establish a connection with Tera Term, though.

**gkflyer13** · January 24th, 2021, 03:04 PM

Nevermind, I was able to set it up on Tera Term. I type on one computer and it comes out the other and vice versa, so I know it works. I'll let you know if basic file transfers work and if XMODEM file transfers work with the Christensen protocol option.

**gkflyer13** · January 28th, 2021, 07:40 PM

Alright. If anybody wants to know how I did it, here's the steps.

Launch MDM730.

Type "LOG X:" X being whatever drive you want to save the file to.

Type "SET" and type the baud rate you want. Start with 300, but I like to use 9600. Make sure to set Tera Term to the same baud rate with Setup > Serial Port > Speed, the rest of the settings should be the same by default.

Type "?" to view the current settings before you proceed.

Once the serial connection between your PC and your TRS-80 is made, you can begin the process. Make sure you use a null modem cable.

Type "t" to enter terminal mode. The letters you type on the PC should show up on the terminal and vice versa.

Prepare Tera Term for sending the file. Use "Transfer > XMODEM > SEND" and click on the file you want to send.

You should now see that a new window is being created; there should be an empty progress bar in this window.

To receive using XMODEM on your TRS-80, type "R file.xyz" Replace file.xyz with whatever file you want to name it. Be sure to include the extension.

You should now be receiving your file. You should see a progress bar on Tera Term going up and "Received: XXX" on the TRS-80 for the amount of data you've received. The TRS-80 will periodically stop for a fraction of a second to write to disk.

Once you see "Transfer Complete" on the TRS-80, you may type CTRL+E to return to the MDM730 command menu.

Type "CPM" to return to CP/M.

Your file has been transferred.

Let me know if you have any questions. You can also type M in the MDM730 command console for a list of commands as well as additional options for the R command. Additionally, you can use S to send files to your PC. Just select "Receive" on Tera Term and you're set to go.

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