Systemservices; Machine Identification - Tandy 1000 SL Technical Reference Manual

Software
System Services
Software Interrupts
15 hex (Zldec)
Function Summary
AH
=
COH: Machine identification
AH
=
15H: Read and write EEPROM data
Function Descriptions
Machine Identification
The machine identification algorithm is the same as all previous Tandy
1000's. As well, the Tandy 1000 SL and Tandy 1000 TL computers have
a new BIOS call to further identify the machine.
All current and previous Tandy 1000 computers have the following
machine identification:
Byte at address FFFF:E
=
FF hex (compatible with IBM PC)
Byte at address FC000:O
=
21 hex (Tandy 1000 unique)
Entry Conditions
AH
=
COH
Exit Conditions
If CF
= o
ES:BX
=
pointer to machine identification data in ROM
DW 0003
DB
xx
ModeiID
DB
xx
SubmodelID
DB
xx
BIOS revision levei
Byte count of data that follows (always 3 )