Owner`s manual

Converting Bedlam to Disk (For Advanced Users Only)

Bedlam is designed to operate in the low 16K of RAM. This is also the area where

TRSDOS loads. (That's why you have to prevent DOS from loading by holding down

the [BREAK] key when loading a cassette tape into a disk system.) To use the

program from diskette, you must use DEBUG (plus TAPE and RELO for Model III

users) to enter one or two machine language programs to first move Bedlam up above

TRSDOS (to store it), then move Bedlam down (to play the game).

Model I

Insert a TRSDOS diskette in Drive m. Insert the Bedlam tape into the cassette

recorder. Make sure the cassette is fully rewound and the "Play" key is down. Press

the Reset button on the TRS-80. DOS READY will appear on the screen. Type:

[D][E][B][U][G] and press [ENTER]. DOS READY will reappear. Press the [BREAK] key

to enter the DEBUG mode. The screen will fill with numbers and letters. From this

point on, do not press any key unless you are told specifically to do so. To make this

next portion easier to use, we will go to a different DEBUG screen. Press the [S] key

once. The screen now looks a bit less cluttered.

Type: [D][8][0][1][0] and press the space bar once. The line you just typed (D8010) told

the DEBUG utility that you wanted to Display the portion of memory that contains

the address 8010. In the left column, look at 8010 (the second line from the top of the

screen). The horizontal line of numbers (to the right of 8010) must be changed.

Type: [M][8][0][1][0] and press the space bar once. The M (in front of the number just

typed) told DEBUG that you wanted to Modify memory, starting at address 8010.

Notice vertical lines appeared on either side of the first two digits after 8010.

Address 8010 presently contains a two digit hexidecimal value. In the blank area at

the lower left corner of the screen, you will see:

8010

00- ←(The two digit number may not be 00 depending on what programs you

may have run recently.)

Each digit can be any number between 0-9 or the letters A-F. DEBUG uses the dash

(-) to ask what this value should be changed to.

The space bar is used in DEBUG to store changes. [ENTER] is only used to leave the

Modify mode. Do not press Enter unless specifically told to do so. Type the following

line exactly (remember to press the space bar once after each pair of digits):

21 00 43 11 20 80 01 00 3D ED B0 C3 00 00