Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-31 01:51:46 +03:00
Code Issues Actions 4 Packages Projects Releases Wiki Activity

idsa.cpp: Update notes (nw)

Browse Source
This commit is contained in:
AJR 2017-11-19 16:55:02 -05:00
parent c0db9e51b3
commit 86366508b4
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/mame/drivers/idsa.cpp
View File

@ -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.