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Added simple 286 detection code #53

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Added simple 286 detection code #53

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1ddc260
Added simple 286 detection code
andreas-jonsson Oct 15, 2024
06c285f
Merge branch 'main' into detect-286
andreas-jonsson Aug 13, 2025
e0241de
Ops. removing bin files
andreas-jonsson Aug 13, 2025
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17 changes: 14 additions & 3 deletions src/GLABIOS.ASM
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Original file line number Diff line number Diff line change
Expand Up @@ -5202,6 +5202,7 @@ POST_MEMORY DB 'RAM', 0 ; RAM Memory test
ENDIF
DB '000 ', POST_K_UNIT ; and KB or KiB
DB ' OK', 0
POST_286 DB '286', 0
IF ARCH_SUB_TYPE EQ ARCH_NEST
POST_V20 DB 'V30'
ELSE
Expand Down Expand Up @@ -10557,11 +10558,21 @@ POST_SYS_VIDEO ENDP
POST_COL_1 POST_CPU, POST_CLR_VAL1 ; display 'CPU' left column
; SI now points to '8088'
CPU_CHECK_TYPE_2:
TEST_GFLAG V20 ; ZF = 0 if V20, ZF = 1 if 8088
JZ CPU_CHECK_TYPE_2_DONE ; jump if 8088
MOV AX, 7000H ; Try to set flag bits 12-14 to 1's
PUSH AX ; Push the test value onto the stack
POPF ; Pop it into the flag register
PUSHF ; Push it back onto the stack
POP AX ; Pop it into AX for check
AND AX, 7000H ; if bits 12-14 are cleared then
JNZ CPU_CHECK_TYPE_V20 ; the chip is a 80286
MOV SI, OFFSET POST_286
JMP CPU_CHECK_TYPE_2_DONE
CPU_CHECK_TYPE_V20:
TEST_GFLAG V20 ; ZF = 0 if V20, ZF = 1 if 8088
JZ CPU_CHECK_TYPE_2_DONE ; jump if 8088
MOV SI, OFFSET POST_V20 ; if not, is V20
CPU_CHECK_TYPE_2_DONE:
CALL OUT_SZ ; write CPU type
CALL OUT_SZ ; write CPU type
POST_COL_END ; end first column

;----------------------------------------------------------------------------;
Expand Down