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Update History.txt & some Phasor-related comments

This commit is contained in:
tomcw 2023-03-07 18:06:06 +00:00
parent fb37310acd
commit 57c26c59b2
2 changed files with 8 additions and 5 deletions
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4
bin/History.txt
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@ -18,7 +18,7 @@ Tom Charlesworth
- At start-up, use the Registry's saved "Window x/y position" to position the AppleWin window correctly for multiple monitors.
- [Change #1033] New command line support for hard disk controller in slots 5 and 7.
- Use '-s5 hdc' or '-s7 hdc' to start up with a hard disk controller (hdc) in slots 5 and 7 respectively.
- Use '-s5h1 <pathname>' and '-s5h2 <pathname>' to connect to hard disk image.
- Use '-s5h1 <pathname>' and '-s5h2 <pathname>' to connect hard disk images.
- NB. There's no GUI configuration support for the hdc in slot 5.
- NB. An hdc in slot 5 allows these 3.5" titles to work: "Perplexing Puzzles" and "Dark Heart of Uukrul".
- [Bug #1193] Phasor: now can't read AY regs (via 6522 PortA) after AY set to INACTIVE function. (Mockingboard still can.)
@ -31,7 +31,7 @@ Tom Charlesworth
- [PR #1171] Refactor the Mockingboard & Phasor code.
- Can now put any sound card (Mockingboard, Phasor or SAM) into either or both slots 4 and 5.
- NB. Allows Mouse card in slot 4 and Mockingboard (or Phasor) in slot 5.
- Change: Command line '-s<N> empty' now works for slots 1-7 (just not slot 0).
- Change: Command line '-s<N> empty' now works for slots 1-7 (so only slot 0 isn't supported).
- Debugger: Improve mini-memory views for AY8913 chip registers: show reg. latch address in white.
- Debugger: Fix 'zpc' command, which wasn't working.

9
source/Mockingboard.cpp
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@ -185,7 +185,7 @@ void MockingboardCard::Get6522IrqDescription(std::string& desc)
//
// AFAICT, inputs to the Phasor GAL are:
// . ORB.b4:3 = Chip Select (CS) for AY1 & AY2 (active low)
// . ORB.b2:0 = PSG Function (RESET, INACTIVE, READ, WRITE, LATCH)
// . ORB.b2:0 = PSG Function (RESET, INACTIVE, READ, WRITE, LATCH) [Or since LATCH=%111, then maybe a 3-input AND: b2.b1.b0 -> GAL?]
// . Phasor mode (Mockingboard, Echo+, Phasor-native)
// . Slot inputs (address, reset, etc)
// And outputs from the GAL are:
@ -195,8 +195,9 @@ void MockingboardCard::Get6522IrqDescription(std::string& desc)
// In Phasor-native mode, GAL logic:
// . AY2 LATCH func selects AY2 and AY1; sets latch addr for AY2 and AY1
// . AY1 LATCH func selects AY1; deselects AY2; sets latch addr for AY1
// . AY2 WRITE func writes AY2 if it's selected
// . AY1 WRITE func writes AY1; writes AY2 if it's selected
// . AY2 & AY1 LATCH func selects AY2 and AY1; sets latch addr for AY2 and AY1
// . AY2 WRITE(READ) func writes(reads) AY2 if it's selected
// . AY1 WRITE(READ) func writes(reads) AY1; writes(reads) AY2 if it's selected. NB. If both chips, then the READ is the OR-sum.
//
// EG, to do a "AY1 LATCH", then write 6522 ORB with b4:3=%01, b2:0=%111
//
@ -231,6 +232,8 @@ void MockingboardCard::WriteToORB(BYTE subunit)
if (m_phasorMode == PH_EchoPlus)
subunit = SY6522_DEVICE_B;
// NB. For PH_Phasor, when selecting *both* AYs, then order matters: first do AY8913_DEVICE_A then AY8913_DEVICE_B
// Reason: from GAL logic: 'AY1 LATCH func' deselects AY2, then 'AY2 LATCH func' selects AY2 and AY1. (And we want both selected)
if (nAY_CS & kAY0)
AY8910_Write(subunit, AY8913_DEVICE_A, value);