Tandy 1000TL Technical Reference errata

[Jeffrey L. Hayes]

I have found the following errors in the manual:

Second page following title page.

The information in this manual is a supplement to and based on a working
knowledge of the following literature:

The 1000 TL _Installation and Operation Guide_ (Packaged with the
computer)

Error: No such manual exists.

Main section, p. 6.

4. Main Logic Board Removal
...
d. Remove the back of the chassis by removing (1) screw at the rear
of the computer and pulling the back of the chassis to the rear
and down to clear the (3) hooks in the bottom of the chassis.

Error: It is also necessary to remove 4 nuts at the back of the chassis.

e. Remove the (11) screws holding the main logic board in place.

Error: It is also necessary to remove the drive B: bracket (to access
one of the screws) and the speaker (another one of the screws).

f. Remove the main logic board by carefully pulling straight back from
under the drive support and out of the chassis.

Error: It is also necessary to remove the volume control clip and knob.

Main section, p. 8.

Switch Settings and Jumper Pin Configurations
Main Logic Board
...
Jumper Function Default
E6-E7 Select Direct Line Audio Input E7-E8
E7-E8 Select Mic Audio Input

Error: The correct information is as follows:

Jumper Function Default
E6-E7 Select Mic Audio Input E6-E7
E7-E8 Select Direct Line Audio Input

If unattenuated direct line audio is connected with the jumper set at
E6-E7, the sound circuitry will be destroyed.

Main section, p. 49. I/O port listing.

Address Description
...
0378-03CF Not Used

Error: The following ports are used by the video controller: 3B4, 3B5,
3B8, 3BA, 3BF.

Layer Top Silkscreen.

Error: Microphone/Line Audio jumper incorrectly labelled. "Microphone
Input" and "Line Audio Input" labels should be reversed.

Video Controller Section, p. 11.

16 COLOR HIGH RESOLUTION 640 X 200 GRAPHICS MODE (E)
...
Can display 16 of 256K possible colors.

Error: Can display only 16 colors.

Video Controller Section, p. 11.

VIDEO I/O MAP

Hex Address Register
...
03DD Not Used

Error: Port 3DD is the Extended RAM Page Register.

Video Controller Section, p. 29.

Error: Register given as "Mode Control". Should read "Color Select".

CPU Controller Section, pp. 10-11.

Error: Text (p. 10) and diagram (p. 11) indicate that the CPU can be reset
by clearing bit 2 at port 68. Writing to this port has no effect.

Software Section, p. 40.

System Services
...
Function Summary
...
AH = 15H: Read and write EEPROM data

Error: Should read "70H".

Software Section, p. 53.

HEX Offset
From Segment Length and
0040:0000 Intended Use
...
62 1 byte - current display page 1 word -
base address + 4 of the CRT
controller card

Error: Should read "62H". Also insert "63H" before "1 word".

Keyboard Scan Code Table, key no. 78.

Error: Extended ASCII scan code for <alt>-X given as "2000". Should read
"2D00".

--

"A Discordian is prohibited of believing what he reads."
- Principia Discordia