Tandy TRS-80 model 4p

Under construction.

Front
Semi side

• Researching the KC-GIDE harddisk interface for the 4p.
• TRS-IDE vs GIDE driver
• Model 4 IDE Hard Disk Interface TRS-IDE original site
• Z80 - IDE interface

First version of my TRS-IDE interface

Remember to reorient the IDE connector on the next board

Entered the following BASIC program (with a disk connected):

10 AD=63
20 X=10
30 OUT 236,16
40 FOR Y= 0 TO X
50 PRINT Y+AD;" ";INP(Y+AD)
60 NEXT Y

The result was:

63 255
64 0
65 1
66 1
67 1
68 0
69 0
70 80
71 80
72 1

The Seagate (ST3144A) doesn't work. Currently testing with a Conner (CP3008E).

Enter:

 SYSTEM (DRIVE=2, DRIVER="HDDVR6")

TRSIDE - IDE Disk Driver for LDOS 6.x/5.x
Enter drive select address <1-4>: 1
Enter total number of heads on drive <1-8>: 8
Enter physical tracks per surface: 22
Heads already in use <.-.-.-.-.-.-.-.>
Enter number of heads for partition <1-8>: 2
Enter starting head: 1

Now a blinking "H" should appear in the upper right side of the screen.

With some drives it does, but the drive is not addressed.

• Virtual library

External IDE for 8-bit bus designs

• Another interesting IDE interface
• For the ZX-spectrum
• S100 bus design

Last update: 2009-12-18

fjkraan@xs4all.nl