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Add support for the DEC layout Televideo Linear Space Invader keyboards to ibmpc_usb. (#711)

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* Add support for the DEC layout Televideo Linear Space Invader keyboards to ibmpc_usb.

See this thread for which keyboards I am referring to:
https://deskthority.net/viewtopic.php?f=2&t=25763

(Many of these keyboards are completely unbranded on the outside, and only the
PCB reads "TELEVIDEO ANSI Scan")

* Add kp comma

* Changing mapping of backspace keys, as discussed in PR review
This commit is contained in:
Purdea Andrei 2021-11-06 14:22:48 +02:00 • committed by GitHub
parent 64ef4e9f83
commit 90d4f42865
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2 changed files with 54 additions and 2 deletions
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55
converter/ibmpc_usb/ibmpc_usb.cpp
View file

@ -330,11 +330,12 @@ uint8_t IBMPCConverter::process_interface(void)
keyboard_kind = PC_AT;
}
} else if (0xAB90 == keyboard_id || // IBM 5576-002
0xAB91 == keyboard_id) { // IBM 5576-003
0xAB91 == keyboard_id) { // IBM 5576-003 or Televideo DEC
// https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#ab90
// https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#ab91
xprintf("\n5576_CS82h:");
keyboard_kind = PC_AT;
if ((0xFA == ibmpc.host_send(0xF0)) &&
(0xFA == ibmpc.host_send(0x82))) {
// switch to code set 82h
@ -342,8 +343,18 @@ uint8_t IBMPCConverter::process_interface(void)
xprintf("OK ");
} else {
xprintf("NG ");
if (0xAB91 == keyboard_id) {
// This must be a Televideo DEC keyboard, which piggybacks on the same keyboard_id as IBM 5576-003
// This keyboard normally starts up using code set 1, but we request code set 2 here:
if ((0xFA == ibmpc.host_send(0xF0)) &&
(0xFA == ibmpc.host_send(0x03))) {
xprintf("OK ");
keyboard_kind = PC_TERMINAL;
} else {
xprintf("NG ");
}
}
}
keyboard_kind = PC_AT;
} else if (0xBFB0 == keyboard_id) { // IBM RT Keyboard
// https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#bfb0
// TODO: LED indicator fix
@ -1116,6 +1127,38 @@ uint8_t IBMPCConverter::translate_5576_cs3(uint8_t code) {
return code;
}
// Televideo DEC Scan code translation
uint8_t IBMPCConverter::translate_televideo_dec_cs3(uint8_t code) {
switch (code) {
case 0x08: return 0x76; // Esc
case 0x8D: return 0x77; // Num Lock
case 0x8E: return 0x67; // Numeric Keypad Slash
case 0x8F: return 0x7F; // Numeric Keypad Asterisk
case 0x90: return 0x7B; // Numeric Keypad Minus
case 0x6E: return 0x65; // Insert
case 0x65: return 0x6d; // Delete
case 0x67: return 0x62; // Home
case 0x6d: return 0x64; // End
case 0x64: return 0x6e; // PageUp
case 0x84: return 0x7c; // Numeric Keypad Plus (Legend says minus)
case 0x87: return 0x02; // Print Screen
case 0x88: return 0x7e; // Scroll Lock
case 0x89: return 0x0c; // Pause
case 0x8A: return 0x03; // VOLD
case 0x8B: return 0x04; // VOLU
case 0x8C: return 0x05; // MUTE
case 0x85: return 0x08; // F13
case 0x86: return 0x10; // F14
case 0x91: return 0x01; // LGUI
case 0x92: return 0x09; // RGUI
case 0x77: return 0x58; // RCTRL
case 0x57: return 0x66; // Backspace
case 0x66: return 0x5D; // JPY
case 0x7c: return 0x68; // Kp Comma
}
return code;
}
int8_t IBMPCConverter::process_cs3(uint8_t code)
{
switch (code) {
@ -1133,6 +1176,10 @@ int8_t IBMPCConverter::process_cs3(uint8_t code)
if (0xAB92 == keyboard_id) {
code = translate_5576_cs3(code);
}
if (0xAB91 == keyboard_id) {
// This must be the Televideo DEC keyboard. (For 5576-003 we don't use scan code set 3)
code = translate_televideo_dec_cs3(code);
}
switch (code) {
case 0xF0:
state_cs3 = CS3_F0;
@ -1179,6 +1226,10 @@ int8_t IBMPCConverter::process_cs3(uint8_t code)
if (0xAB92 == keyboard_id) {
code = translate_5576_cs3(code);
}
if (0xAB91 == keyboard_id) {
// This must be the Televideo DEC keyboard. (For 5576-003 we don't use scan code set 3)
code = translate_televideo_dec_cs3(code);
}
switch (code) {
case 0x83: // PrintScreen
matrix_break(0x02);

1
converter/ibmpc_usb/ibmpc_usb.hpp
View file

@ -111,6 +111,7 @@ class IBMPCConverter {
uint8_t translate_5576_cs2(uint8_t code);
uint8_t translate_5576_cs2_e0(uint8_t code);
uint8_t translate_5576_cs3(uint8_t code);
uint8_t translate_televideo_dec_cs3(uint8_t code);
int16_t read_wait(uint16_t wait_ms);
uint16_t read_keyboard_id(void);