No-Slot Clock - Revision history

RMHenry: /* WDC CPUs */

2025-09-17T00:56:25Z

WDC CPUs

← Older revision		Revision as of 17:56, 16 September 2025
Line 148:		Line 148:

	=== WDC CPUs ===		=== WDC CPUs ===
	The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No-Slot Clock from being detected.		The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing or level incompatibility that prevents the No-Slot Clock from being detected.<br>
	This can be resolved by changing the 74S02 below Slot 6 to a 74HC02. We suspect a timing or level issue is the cause.		This can sometimes be resolved by changing the 74S02 below Slot 6 to a 74HC02. We suspect a timing or level issue is the cause. We have also found that sometimes replacing the HAL with a slower speed GAL, 15 or 25 speed grade, does help with the HC02 change. Oddly enough, replacing the LS224's with HCT224's don't seem to help the issue. Also, sometimes adding a 8-12" hanging flywire to Pin 11 (A2) of the CPU allows the NSC to be detected and becomes more stable. You results may vary.<br>
			If someone would like to take timing and level captures, perhaps the reason for the WDC inconsistency can be identified, and an actual fix be created.

	Products affected by this issue include, but are not limited to:		Products affected by this issue include, but are not limited to:

RMHenry: /* WDC CPUs */

2025-09-05T22:53:50Z

WDC CPUs

← Older revision		Revision as of 15:53, 5 September 2025
Line 149:		Line 149:
	=== WDC CPUs ===		=== WDC CPUs ===
	The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No-Slot Clock from being detected.		The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No-Slot Clock from being detected.
			This can be resolved by changing the 74S02 below Slot 6 to a 74HC02. We suspect a timing or level issue is the cause.

	Products affected by this issue include, but are not limited to:		Products affected by this issue include, but are not limited to:

Cryu: Link to UltraWarp page

2023-10-04T03:31:13Z

Link to UltraWarp page

← Older revision		Revision as of 20:31, 3 October 2023
Line 152:		Line 152:
	Products affected by this issue include, but are not limited to:		Products affected by this issue include, but are not limited to:

	* UltraWarp by ReActiveMicro		* [[UltraWarp]] by ReActiveMicro
	* FastChip //e by A2Heaven		* FastChip //e by A2Heaven
	* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]		* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]

Cryu at 03:23, 4 October 2023

2023-10-04T03:23:50Z

← Older revision		Revision as of 20:23, 3 October 2023
Line 145:		Line 145:
	The original driver's probe routine will lock up the machine if a Microsoft Z-80 SoftCard is installed.		The original driver's probe routine will lock up the machine if a Microsoft Z-80 SoftCard is installed.

	InexorableTash's updated driver (available in the "Downloadable Files" section of this page) does not have this issue.		InexorableTash's[https://github.com/a2stuff/prodos-drivers] updated driver (available in the "Downloadable Files" section of this page) does not have this issue.

	=== WDC CPUs ===		=== WDC CPUs ===

Cryu: Fix a few links -- what's going on with trailing whitespace?

2023-10-04T03:06:27Z

Fix a few links -- what's going on with trailing whitespace?

← Older revision		Revision as of 20:06, 3 October 2023
Line 145:		Line 145:
	The original driver's probe routine will lock up the machine if a Microsoft Z-80 SoftCard is installed.		The original driver's probe routine will lock up the machine if a Microsoft Z-80 SoftCard is installed.

	InexorableTash's ~~[https://github.com/a2stuff/prodos-drivers~~ updated driver] does not have this issue.		InexorableTash's updated driver (available in the "Downloadable Files" section of this page) does not have this issue.

	=== WDC CPUs ===		=== WDC CPUs ===
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	Her modified NS.CLKUW.SYSTEM can be found [https://github.com/bobbimanners/ProDOS-Utils here]		Her modified NS.CLKUW.SYSTEM can be found [https://github.com/bobbimanners/ProDOS-Utils here]

	This workaround has been incorporated into the ~~[https://github.com/a2stuff/prodos-drivers~~ NS.CLOCK.SYSTEM driver by InexorableTash]		This workaround has been incorporated into the updated NS.CLOCK.SYSTEM driver by InexorableTash (available in the "Downloadable Files" section of this page)

	=== 24-pin ROMs ===		=== 24-pin ROMs ===

Cryu: Correct missing CamelCase

2023-10-04T02:51:52Z

Correct missing CamelCase

← Older revision		Revision as of 19:51, 3 October 2023
Line 152:		Line 152:
	Products affected by this issue include, but are not limited to:		Products affected by this issue include, but are not limited to:

	* UltraWarp by ~~ReactiveMicro~~		* UltraWarp by ReActiveMicro
	* FastChip //e by A2Heaven		* FastChip //e by A2Heaven
	* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]		* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]
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	The No-Slot Clock is designed to be installed under 28-pin ROMs, and therefore is not compatible out-of-the-box with 24-pin ROMs.		The No-Slot Clock is designed to be installed under 28-pin ROMs, and therefore is not compatible out-of-the-box with 24-pin ROMs.

	However, the No-Slot Clock can be modified to work with a 24-pin ROM. ~~ReactiveMicro~~ takes no responsibility for any resulting damage if the end user decides to perform the following modification.		However, the No-Slot Clock can be modified to work with a 24-pin ROM. ReActiveMicro takes no responsibility for any resulting damage if the end user decides to perform the following modification.

	With that disclaimer out of the way, here's how:		With that disclaimer out of the way, here's how:

Cryu: Fix link for ProDOS-drivers

2023-10-04T02:48:53Z

Fix link for ProDOS-drivers

← Older revision		Revision as of 19:48, 3 October 2023
Line 181:		Line 181:


	File:5.25floppy.jpg\|InexorableTash's ProDOS Drivers\|link=https://wiki.reactivemicro.com/images/1/10/~~prodos~~-drivers-20231004.po		File:5.25floppy.jpg\|InexorableTash's ProDOS Drivers\|link=https://wiki.reactivemicro.com/images/0/00/Prodos-drivers-20231004.po

	File:5.25floppy.jpg\|Current Setup and Test Disk\|link=https://wiki.reactivemicro.com/images/1/10/SMT_1.4.dsk		File:5.25floppy.jpg\|Current Setup and Test Disk\|link=https://wiki.reactivemicro.com/images/1/10/SMT_1.4.dsk

Cryu: Consistently use "No-Slot Clock"

2023-10-04T00:52:45Z

Consistently use "No-Slot Clock"

← Older revision		Revision as of 17:52, 3 October 2023
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	== Compatibility Issues ==		== Compatibility Issues ==

	The RM No Slot Clock design has been well tested in many Apple II Personal Computer Systems.		The RM No-Slot Clock design has been well tested in many Apple II Personal Computer Systems.

	=== Microsoft Z-80 SoftCard ===		=== Microsoft Z-80 SoftCard ===
Line 148:		Line 148:

	=== WDC CPUs ===		=== WDC CPUs ===
	The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No Slot Clock from being detected.		The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No-Slot Clock from being detected.

	Products affected by this issue include, but are not limited to:		Products affected by this issue include, but are not limited to:
Line 156:		Line 156:
	* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]		* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]

	This can be ameliorated by installing the No Slot Clock underneath the ROM on a card that interfaces to the Apple ][ bus with a 74LS245 bus transceiver, such as an Apple Super Serial Card or a Videx Videoterm 80-column card (but see below).		This can be ameliorated by installing the No-Slot Clock underneath the ROM on a card that interfaces to the Apple ][ bus with a 74LS245 bus transceiver, such as an Apple Super Serial Card or a Videx Videoterm 80-column card (but see below).

	Bobbi Webber-Manners has reported that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM results in proper detection of a No Slot Clock installed on a card; this scheme does not work if the No Slot Clock is installed underneath the CD ROM on the logic board.		Bobbi Webber-Manners has reported that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM results in proper detection of a No-Slot Clock installed on a card; this scheme does not work if the No-Slot Clock is installed underneath the CD ROM on the logic board.

	Her modified NS.CLKUW.SYSTEM can be found [https://github.com/bobbimanners/ProDOS-Utils here]		Her modified NS.CLKUW.SYSTEM can be found [https://github.com/bobbimanners/ProDOS-Utils here]
Line 166:		Line 166:
	=== 24-pin ROMs ===		=== 24-pin ROMs ===

	The No Slot Clock is designed to be installed under 28-pin ROMs, and therefore is not compatible out-of-the-box with 24-pin ROMs.		The No-Slot Clock is designed to be installed under 28-pin ROMs, and therefore is not compatible out-of-the-box with 24-pin ROMs.

	However, the No Slot Clock can be modified to work with a 24-pin ROM. ReactiveMicro takes no responsibility for any resulting damage if the end user decides to perform the following modification.		However, the No-Slot Clock can be modified to work with a 24-pin ROM. ReactiveMicro takes no responsibility for any resulting damage if the end user decides to perform the following modification.

	With that disclaimer out of the way, here's how:		With that disclaimer out of the way, here's how:

	* connect pins 1, 26, 27, and 28 on the No Slot Clock		* connect pins 1, 26, 27, and 28 on the No-Slot Clock
	* install the No Slot Clock into the 24-pin ROM socket with the bottom pins aligned (i.e., No Slot Clock pin 3 connected to socket pin 1, 14 to 12, 15 to 13, and so forth)		* install the No-Slot Clock into the 24-pin ROM socket with the bottom pins aligned (i.e., No-Slot Clock pin 3 connected to socket pin 1, 14 to 12, 15 to 13, and so forth)

	== Downloadable Files ==		== Downloadable Files ==

	<div class="new_window">		<div class="new_window">
	<gallery class="center" widths=150px heights=80 caption="RM No Slot Clock (NSC)">		<gallery class="center" widths=150px heights=80 caption="RM No-Slot Clock (NSC)">

Cryu: Update with information on new (better!) driver and 24-pin ROM compatibility

2023-10-04T00:31:51Z

Update with information on new (better!) driver and 24-pin ROM compatibility

← Older revision		Revision as of 17:31, 3 October 2023
Line 140:		Line 140:
	== Compatibility Issues ==		== Compatibility Issues ==

	The RM No Slot Clock design has been well tested in many Apple II Personal Computer Systems~~. To date the only know issue is coexistence with the Microsoft Z-80 SoftCard. No damage will occur, however the Apple II will tend to lock up on boot~~.		The RM No Slot Clock design has been well tested in many Apple II Personal Computer Systems.

	~~There have been reports that sometimes the Apple II~~ will ~~work correctly with~~ the SoftCard ~~in Slot 5~~.		=== Microsoft Z-80 SoftCard ===
			The original driver's probe routine will lock up the machine if a Microsoft Z-80 SoftCard is installed.

	~~=== UltraWarp ===~~		InexorableTash's [https://github.com/a2stuff/prodos-drivers updated driver] does not have this issue.
	~~There has been a reported~~ issue ~~with the UltraWarp and the No-Slot Clock when used together~~.

	~~Bobbi Webber-Manners reported~~ the ~~following:<br>~~		=== WDC CPUs ===
	No Slot Clock ~~works fine with the Ultrawarp disabled (ie: STA $C050B) using NS~~.~~CLOCK.SYSTEM and NSCUTIL.SYSTEM.<br>~~		The W65C02S and W65C816S microprocessors from Western Design Center appear to have a timing incompatibility that prevents the No Slot Clock from being detected.
	~~With the Ultrawarp enabled~~, ~~at either 1MHz (ie~~: ~~STA $C05D) mode or at~~ the ~~full 13MHz, NSCUTIL~~.~~SYSTEM still works file, but NS~~.~~CLOCK~~.~~SYSTEM is unable to read~~ the No Slot Clock~~.<br>~~
	~~I played around with NS.CLOCK.SYSTEM~~ to ~~try to investigate~~ the ~~issue. As you can see from the above~~, ~~it is not~~ an ~~issue of the accelerator speed since it fails with UW at 1MHz~~.~~<br>~~		Products affected by this issue include, but are not limited to:
	~~I discovered~~ that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM ~~magically made it work. I settled~~ on ~~LDA $C00B, since~~ this ~~seems to have no documented effects. I built a modified NS.CLOCK.SYSTEM called NS.CLKUW.SYSTEM which seems to~~ work ~~fine~~ on ~~all systems with or without UW installed. This seems to be a corner-case bug in~~ the ~~Ultrawarp~~ logic.~~<br>~~
	~~Modded and fixed~~ NS.CLKUW.SYSTEM can be found ~~here:~~ https://github.com/bobbimanners/ProDOS-Utils/~~tree~~/~~master~~/~~No_Slot_Clock<br>~~		* UltraWarp by ReactiveMicro
	~~[END]~~		* FastChip //e by A2Heaven
			* Homebrew CPU replacements per the [https://www.westerndesigncenter.com/wdc/AN-002_W65C02S_Replacements.php Western Design Center application note]

			This can be ameliorated by installing the No Slot Clock underneath the ROM on a card that interfaces to the Apple ][ bus with a 74LS245 bus transceiver, such as an Apple Super Serial Card or a Videx Videoterm 80-column card (but see below).

			Bobbi Webber-Manners has reported that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM results in proper detection of a No Slot Clock installed on a card; this scheme does not work if the No Slot Clock is installed underneath the CD ROM on the logic board.

			Her modified NS.CLKUW.SYSTEM can be found [https://github.com/bobbimanners/ProDOS-Utils here]

			This workaround has been incorporated into the [https://github.com/a2stuff/prodos-drivers NS.CLOCK.SYSTEM driver by InexorableTash]

			=== 24-pin ROMs ===

			The No Slot Clock is designed to be installed under 28-pin ROMs, and therefore is not compatible out-of-the-box with 24-pin ROMs.

			However, the No Slot Clock can be modified to work with a 24-pin ROM. ReactiveMicro takes no responsibility for any resulting damage if the end user decides to perform the following modification.

			With that disclaimer out of the way, here's how:

			* connect pins 1, 26, 27, and 28 on the No Slot Clock
			* install the No Slot Clock into the 24-pin ROM socket with the bottom pins aligned (i.e., No Slot Clock pin 3 connected to socket pin 1, 14 to 12, 15 to 13, and so forth)

	== Downloadable Files ==		== Downloadable Files ==
Line 159:		Line 179:
	<div class="new_window">		<div class="new_window">
	<gallery class="center" widths=150px heights=80 caption="RM No Slot Clock (NSC)">		<gallery class="center" widths=150px heights=80 caption="RM No Slot Clock (NSC)">


			File:5.25floppy.jpg\|InexorableTash's ProDOS Drivers\|link=https://wiki.reactivemicro.com/images/1/10/prodos-drivers-20231004.po

	File:5.25floppy.jpg\|Current Setup and Test Disk\|link=https://wiki.reactivemicro.com/images/1/10/SMT_1.4.dsk		File:5.25floppy.jpg\|Current Setup and Test Disk\|link=https://wiki.reactivemicro.com/images/1/10/SMT_1.4.dsk

RMHenry: /* UltraWarp */

2021-06-05T22:47:32Z

UltraWarp

← Older revision		Revision as of 15:47, 5 June 2021
Line 152:		Line 152:
	I played around with NS.CLOCK.SYSTEM to try to investigate the issue. As you can see from the above, it is not an issue of the accelerator speed since it fails with UW at 1MHz.<br>		I played around with NS.CLOCK.SYSTEM to try to investigate the issue. As you can see from the above, it is not an issue of the accelerator speed since it fails with UW at 1MHz.<br>
	I discovered that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM magically made it work. I settled on LDA $C00B, since this seems to have no documented effects. I built a modified NS.CLOCK.SYSTEM called NS.CLKUW.SYSTEM which seems to work fine on all systems with or without UW installed. This seems to be a corner-case bug in the Ultrawarp logic.<br>		I discovered that inserting a load from somewhere in $C0xx in NS.CLOCK.SYSTEM magically made it work. I settled on LDA $C00B, since this seems to have no documented effects. I built a modified NS.CLOCK.SYSTEM called NS.CLKUW.SYSTEM which seems to work fine on all systems with or without UW installed. This seems to be a corner-case bug in the Ultrawarp logic.<br>
	NS.CLKUW.SYSTEM can be found here: https://github.com/bobbimanners/ProDOS-Utils/tree/master/No_Slot_Clock<br>		Modded and fixed NS.CLKUW.SYSTEM can be found here: https://github.com/bobbimanners/ProDOS-Utils/tree/master/No_Slot_Clock<br>
	[END]		[END]