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viacuda: properly initialize VIA registers.

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This commit is contained in:
Maxim Poliakovski
2021-10-18 16:37:18 +02:00
parent 46549d68a2
commit f194887d34
1 changed files with 17 additions and 7 deletions
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24
devices/viacuda.cpp
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@@ -1,6 +1,6 @@
/* /*
DingusPPC - The Experimental PowerPC Macintosh emulator DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-20 divingkatae and maximum Copyright (C) 2018-21 divingkatae and maximum
(theweirdo) spatium (theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info) (Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@@ -36,14 +36,24 @@ using namespace std;
ViaCuda::ViaCuda() { ViaCuda::ViaCuda() {
this->name = "ViaCuda"; this->name = "ViaCuda";
/* FIXME: is this the correct // VIA reset clears all internal registers to logic 0
VIA initialization? */ // except timers/counters and the shift register
this->via_regs[VIA_A] = 0x80; // as stated in the 6522 datasheet
this->via_regs[VIA_DIRB] = 0xFF; this->via_regs[VIA_A] = 0;
this->via_regs[VIA_DIRA] = 0xFF; this->via_regs[VIA_B] = 0;
this->via_regs[VIA_DIRB] = 0;
this->via_regs[VIA_DIRA] = 0;
this->via_regs[VIA_IER] = 0;
this->via_regs[VIA_ACR] = 0;
this->via_regs[VIA_PCR] = 0;
this->via_regs[VIA_IFR] = 0;
// load maximum value into the timer registers for safety
// (not prescribed in the 6522 datasheet)
this->via_regs[VIA_T1LL] = 0xFF; this->via_regs[VIA_T1LL] = 0xFF;
this->via_regs[VIA_T1LH] = 0xFF; this->via_regs[VIA_T1LH] = 0xFF;
this->via_regs[VIA_IER] = 0x7F; this->via_regs[VIA_T2CL] = 0xFF;
this->via_regs[VIA_T2CH] = 0xFF;
// PRAM is part of Cuda // PRAM is part of Cuda
this->pram_obj = std::unique_ptr<NVram> (new NVram("pram.bin", 256)); this->pram_obj = std::unique_ptr<NVram> (new NVram("pram.bin", 256));