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fidel_cc1: add notes (nw)

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This commit is contained in:
hap 2019-03-22 15:02:00 +01:00
parent 464750e988
commit 2ccef2dfd4
2 changed files with 22 additions and 10 deletions
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26
src/mame/drivers/fidel_cc1.cpp
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@ -1,22 +1,30 @@
// license:BSD-3-Clause
// copyright-holders:hap
// thanks-to:Berger
// thanks-to:Berger, Sean Riddle
/******************************************************************************
*
* fidel_cc1.cpp, subdriver of machine/fidelbase.cpp, machine/chessbase.cpp
Fidelity's 1st generation chess computers:
- *Chess Challenger
- *Chess Challenger 3
- *Chess Challenger 10 (UCC10)
* denotes not dumped (actually CC1 is dumped, but with half of the contents missing)
TODO:
- driver is untested, but it should be easy to get working when a good dump
shows up (or a rom of CC3, even)
*******************************************************************************
Fidelity Chess Challenger (1)
-------------------
Chess Challenger (1)
--------------------
This is the world's 1st released dedicated chess computer. Oddly, the rows/columns
are reversed: left to right is 1-8, bottom to top is A-H, eg. pawn from d2 to d4
is 4b to 4d here.
are reversed: left to right is 1-8, bottom to top is A-H, eg. pawn from D2 to D4
is 4B to 4D here.
PCB label PC-P-86, P179 C-2 7.77
NEC 8080AF @ 2MHz(18MHz XTAL through a 8224)
Everything goes via a NEC B8228, its special features are unused.
NEC 2316A ROM(2KB), 4*2101AL RAM(0.5KB total)
@ -25,6 +33,10 @@ NEC 2316A ROM(2KB), 4*2101AL RAM(0.5KB total)
Chess Challenger 3 is on the same hardware, but with double ROM size, and they
corrected the reversed chess notation. It was also offered as an upgrade to CC1.
Chess Challenger 10 version 'C'(model UCC10) is on (nearly) the same PCB too,
label P179 C-3 9.77, with a small daughterboard for 8KB ROM. Again, it was also
offered as an upgrade to CC1, or CC3.
******************************************************************************/
#include "emu.h"
@ -88,8 +100,10 @@ READ8_MEMBER(cc1_state::ppi_porta_r)
{
// 74148(priority encoder) I0-I7: inputs
// d0-d2: 74148 S0-S2, d3: 74148 GS
u8 data = count_leading_zeros(m_inp_matrix[0]->read()) - 24;
// d5-d7: more inputs (direct)
u8 data = (count_leading_zeros(m_inp_matrix[0]->read()) - 24) | (~m_inp_matrix[1]->read() << 5 & 0xe0);
data |= ~m_inp_matrix[1]->read() << 5 & 0xe0;
// d4: 555 Q
return data | ((m_delay->enabled()) ? 0x10 : 0);

6
src/mame/drivers/fidel_cc10.cpp
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@ -13,14 +13,12 @@ TODO:
Fidelity Chess Challenger 10 (CCX)
-------------------
4 versions are known to exist: A,B,C,D. Strangely, version C(UCC10) has an 8080
instead of Z80. Chess Challenger 1,3 and 7 also run on very similar hardware.
3 versions are known to exist: A,B,C. Strangely, version C(UCC10) has an 8080
instead of Z80 and no beeper, it's on CC1-based hardware.
Z80A CPU @ 4MHz, NEC D8255C
4KB ROM(NEC 2332A), 2*256 bytes RAM(4*NEC 2111AL-4)
The beeper is via a 556 timer, fixed-frequency at around 1300-1400Hz.
Not all hardware configurations include the beeper.
Checker Challenger 4 (ACR) is on the same PCB, twice less RAM and the beeper gone.