Merge pull request #644 from dinoboards/dean-dev-2026-01-07-fix-vdp-detection

hbios/tms: fix for tms9918 and added detection for 'Super V9958' fpga

Source/HBIOS/tms.asm

@@ -321,22 +321,25 @@ TMS_INIT:
 	RET
 ;
 TMS_INIT1:
-	CALL 	TMS_CRTINIT		; SETUP THE TMS/V99x8 CHIP REGISTERS
-					; THIS IS BEST DONE BEFORE DETECTION OF TYPE
-					; AND VRAM SIZE
-
 	CALL PRTSTRD
 	.TEXT	" VDP=$"
 
 	CALL	TMS_GETTYP		; A <- 0: TMS9918A, 1: V9938, 2: V9958, x: VDP ID
 
+	PUSH	AF
+	CALL 	TMS_CRTINIT		; SETUP THE TMS/V99x8 CHIP REGISTERS
+					; THIS IS BEST DONE BEFORE DETECTION OF TYPE
+					; AND VRAM SIZE
+	POP	AF
+
+
 	INC	A
 	DEC	A
 	JR	NZ, TMS_NOT9918
 
 	CALL PRTSTRD
 	.TEXT	"TMS9918 VRAM=16KB INTERRUPT=60HZ$"
-	JR	TMS_INIT3
+	JR	TMS_INIT4
 
 TMS_NOT9918:
 	DEC	A
@@ -347,9 +350,18 @@ TMS_NOT9918:
 	JR	TMS_INIT2
 
 TMS_NOT9938:
-	; ASSUME V9958
+	DEC	A
+	JR	NZ, TMS_NOTV9958
+
 	CALL PRTSTRD
 	.TEXT	"V9958$"
+	JR	TMS_INIT2
+
+TMS_NOTV9958:
+	; ASSUME SUPER V9958
+	CALL PRTSTRD
+	.TEXT	"SUPER V9958 VRAM=8MB$"
+	JR	TMS_INIT3
 
 TMS_INIT2:
 	CALL PRTSTRD
@@ -361,18 +373,19 @@ TMS_INIT2:
 	JR	NZ, NOT_64K
 
 	PRTS("64KB$")
-	JR	TMS_INIT3
+	JR	TMS_INIT4
 
 NOT_64K:
 	DEC	A
 	JR	NZ, NOT_128K
 
 	PRTS("128KB$")
-	JR	TMS_INIT3
+	JR	TMS_INIT4
 
 NOT_128K:
 	PRTS("192KB$")
 
+TMS_INIT3:
 #IF (TMSTIMENABLE)
 	CALL PRTSTRD
 #IF (TICKFREQ == 50)
@@ -382,7 +395,7 @@ NOT_128K:
 #ENDIF
 
 #ENDIF
-TMS_INIT3:
+TMS_INIT4:
 	CALL	PC_SPACE
 	LD	A,TMS_COLS
 	CALL	PRTDEC8
@@ -799,7 +812,7 @@ TMS_PROBE:
 ;
 ; ASSUMES INTERRUPTS ARE DISABLED (DI)
 ;
-; A <- 0: TMS9918A, 1: V9938, 2: V9958, x: VDP ID
+; A <- 0: TMS9918A, 1: V9938, 2: V9958, 3: Super V9958
 ; F <- z: TMS9918A, nz: other
 ;
 TMS_GETTYP:
@@ -815,7 +828,9 @@ TMS_GETTYP:
 	EZ80_IO
 	IN	A,(TMS_CMDREG)          ; READ S#1
 	AND	00111110B        	; GET VDP ID
-	RRCA
+	RRCA				; 00000 - V9938 1
+					; 00010 - V9958 2
+					; 10010 - v9958 3
 
 	EX	AF,AF'
 	XOR	A			; RESTORE SELECT REGISTER TO S#0 FOR INT HANDLER
@@ -826,7 +841,14 @@ TMS_GETTYP:
 	OUT	(TMS_CMDREG),A
 	EX	AF,AF'
 
-	RET 	NZ               	; RETURN VDP ID FOR V9958 OR HIGHER
+	JR	Z, TMS_ISV9938
+	CP	2
+	RET	Z			; RETURN 2 FOR V9958
+
+	LD	A, 3
+	RET				; RETURN 3 FOR SUPER V9958
+
+TMS_ISV9938:
 	INC 	A                	; RETURN 1 FOR V9938
 	RET
 ;