Merge pull request #656 from dinoboards/dean-dev-2026-02-02-tms-tweaks-for-vram-detection

tms: re-activated vram detection for V99x8 chips only

Author: wwarthen

Source/HBIOS/std.asm

@@ -315,6 +315,14 @@ TMSMODE_NABU	.EQU	9		; NABU
 TMSMODE_MSXUKY	.EQU	10		; STD MSX PORTS + USB KEYBOARD
 TMSMODE_N8PC	.EQU	11		; N8 BUILT-IN VIDEO + PS2 KEYBOARD
 ;
+; TMS DRIVER VDP TYPES
+;
+TMSVDP_TMS9918	.EQU	0		; TMS9918A
+TMSVDP_V9938	.EQU	1		; YAMAHA V9938 VDP (WITH 64K TO 192K VRAM)
+TMSVDP_V9958	.EQU	2		; YAMAHA V9958 VDP (WITH 64K TO 192K VRAM)
+TMSVDP_SUPER	.EQU	3		; FPGA V9958 MODULE WITH EXTENSIONS
+TMSVDP_F18A	.EQU	4		; MSX FPGA TMS9918 REPLACEMENT
+;
 ; CVDU VIDEO MODE SELECTIONS
 ;
 CVDUMODE_NONE	.EQU	0

Source/HBIOS/tms.asm

@@ -357,11 +357,26 @@ TMS_INIT1:
 	CALL 	TMS_CRTINIT		; SETUP THE TMS/V99x8 CHIP REGISTERS
 
 TMS_INIT2:
-	JR	TMS_INIT3		; SKIPPING THIS FOR NOW...
+	; ONLY DO VRAM DETECTION FOR V99X8 (NOT THE TMS OR F18A)
 
-	CALL PRTSTRD
+	LD	A, (TMS_ATTRIB)
+	OR	A
+	JR	Z, TMS_INIT3		; SKIP VRAM PROBE FOR TMS9918x
+	CP	TMSVDP_F18A
+	JR	Z, TMS_INIT3		; SKIP VRAM PROBE FOR F18A
+
+	CALL	PRTSTRD
 	.TEXT	" VRAM=$"
 
+	CP	TMSVDP_SUPER		; SUPER HAS 1MB OF VRAM, NO NEED TO PROBE IT
+	JR	NZ, TMS_INIT2A
+
+	CALL	PRTSTRD
+	.TEXT	"1MB$"
+	JR	TMS_INIT3
+
+TMS_INIT2A:
+
 	CALL	TMS_VRMPRB
 
 	DEC	A
@@ -841,13 +856,13 @@ TMS_GETTYP:
 ;
 	; RETURN THE IDENTIFIED CHIP ID
 	JR	Z, TMS_ISV9938
-	CP	2
+	CP	TMSVDP_V9958
 	RET	Z			; RETURN 2 FOR V9958
-	LD	A, 3
+	LD	A, TMSVDP_SUPER
 	RET				; RETURN 3 FOR SUPER V9958
 
 TMS_ISV9938:
-	INC	A			; RETURN 1 FOR V9938
+	INC	A			; RETURN 1 (TMSVDP_V9938)
 	RET
 
 TMS_ISF18A:
@@ -894,7 +909,7 @@ TMS_ISF18A:
 
 	; WE DON'T BOTHER TO RESET THE STATUS REGISTER SELECTION OR
 	; RELOCK BECAUSE THIS IS NOT AN F18A!
-	XOR	A			; CHIP ID FOR 9918A
+	XOR	A			; CHIP ID FOR 9918A (TMSVDP_TMS9918)
 	RET				; NOT F18A: A=0
 	
 TMS_ISF18A1:
@@ -914,7 +929,7 @@ TMS_ISF18A1:
 	EZ80_IO
 	OUT 	(TMS_CMDREG),A
 ;
-	LD	A,4			; F18A: A=4
+	LD	A, TMSVDP_F18A		; F18A: A=4
 	RET	
 	
 ;
@@ -1542,7 +1557,7 @@ TMS_STRF18A	.TEXT	"F18A$"
 ; ANSI-->TMS Color Conversion Table
 TMS_COLOR_TBL	.DB	$01,$08,$02,$0A,$04,$06,$0C,$0F,$0E,$09,$03,$0B,$05,$0D,$07,$0F
 ;
-TMS_ATTRIB	.DW	0		; VDA DEVICE ATTRIBUTES (VDP_ID,VRAM,FREQ)
+TMS_ATTRIB	.DW	0		; VDA DEVICE ATTRIBUTES (VDP_ID,VRAM,FREQ) (TMSVDP_xxxx)
 ;
 ;==================================================================================================
 ;   TMS DRIVER - INSTANCE DATA