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author AJR <ajrhacker@users.noreply.github.com>2017-11-19 16:55:02 -0500
committer AJR <ajrhacker@users.noreply.github.com>2017-11-19 16:55:02 -0500
commit86366508b43760d0f5cb625c5b33eb0550a45dd8 (patch)
tree8817e164c77a19765f8f5acf11058698563ee3e0
parentc0db9e51b3477a62434596b95edc70925576a131 (diff)
idsa.cpp: Update notes (nw)
-rw-r--r--src/mame/drivers/idsa.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mame/drivers/idsa.cpp b/src/mame/drivers/idsa.cpp
index c2a08c1b61d..024150bae00 100644
--- a/src/mame/drivers/idsa.cpp
+++ b/src/mame/drivers/idsa.cpp
@@ -9,10 +9,10 @@ Hardware:
---------
CPU: Z80 @ 4 MHz
INT: IRQ @ 977 Hz (4MHz/2048/2) or 488 Hz (4MHz/2048/4)
-IO: DMA, AY8910 ports
+DRIVERS: 2 x 8255 driving lamps and coils, used as demultiplexers only (no read access)
DISPLAY: bsktball: 7-digit 7-segment panels with PROM-based 5-bit BCD data (allowing a simple alphabet)
v1: 6-digit 7-segment panels with BCD decoding
-SOUND: 2 x AY8910 @ 2 MHz plus SP0256 @ 3.12 MHz on board
+SOUND: 2 x AY8910 @ 2 MHz (also used as output interface) plus SP0256 @ 3.12 MHz on board
Schematic is terrible, lots of important info left out. Need the V1 manual & schematic.