CliffHangerNotes

(Difference between revisions)

Revision as of 18:59, 6 October 2016

Pin	Name	Description
1	RAS'	[output] RAS' DRAM strobe
2	CAS'	[output] CAS' DRAM strobe
3-10	AD7-AD0	[output] DRAM address output
11	R/W'	[output] DRAM read/write output
12	VSS	Ground
13	MODE	[input] VDP register mode
14	CSW'	[input] chip select write strobe
15	CSR'	[input] chip select read strobe
16	INT'	[output] chip generated interrupt at the start of new vblank
17-24	CD7-CD0	[input/output] 8-bit data bus to whatever is controlling the VDP (usually the CPU). CD0 is the most significant bit.
25-32	RD7-RD0	[input/output] DRAM data bus
33	VDD	power supply, 5V
34	RST'/SYNC	[input] reset when low (under 0.6V), can be used to indicate 'sync active' when voltage is 10-12. It appears that cliff hanger does use this to sync to the laserdisc video.
35	B-Y	[output] analog color channel output
36	Y	[output] analog color channel output
37	?	?
38	R-Y	[output] analog color channel output
39	XTAL2	[input] clock input
40	XTAL1	[input] clock input

@@ Line 57: / Line 57: @@
 |34
 |RST'/SYNC
-|[input] reset when low, can be used for external sync when high, but I don't know the voltage levels yet.  It appears that cliff hanger does use this to sync to the laserdisc video.
+|[input] reset when low (under 0.6V), can be used to indicate 'sync active' when voltage is 10-12.  It appears that cliff hanger does use this to sync to the laserdisc video.
 |-
 |35