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Showing results 1 to 40 of 201
Search took 0.04 seconds. Search: Posts Made By: thebajaguy
Forum: support.WinUAE 20 February 2024, 06:13
Replies: 14
Views: 5,547
Posted By thebajaguy
FWIW - the Beta2 ROMS are the early...

FWIW - the Beta2 ROMS are the early scsidev.device v2.0 driver, an update on the original v1.0 ROMs, which was soon bumped to v2.2 and v2.3 and called 'Advanced AutoBoot ROM' kit back in the Impact...
Forum: support.Hardware 01 June 2023, 23:50
Replies: 24
Views: 1,701
Posted By thebajaguy
It is possible you may want to tinker with the...

It is possible you may want to tinker with the Amiga Test Kit:

https://github.com/keirf/Amiga-Stuff/releases

The maker, Keir, is in France, IIRC.

Alternatively, a DiagROM might be a tool...
Forum: support.Hardware 31 May 2023, 02:58
Replies: 24
Views: 1,701
Posted By thebajaguy
Making an assumption that you have a PAL (Agnus)...

Making an assumption that you have a PAL (Agnus) machine in a PAL / 50Hz environment and a PAL monitor, but that could be wrong.

Make sure you didn't end up with an NTSC-starting Agnus (like...
Forum: support.Hardware 29 May 2023, 00:17
Replies: 11
Views: 867
Posted By thebajaguy
I've had conversations with tbtorro in the past...

I've had conversations with tbtorro in the past few years. He's stepped away from building them due to a relatively low yield. Even with his pick-and-place gear, his clone of the SIMM32 PCB needs...
Forum: Coders. System 25 May 2023, 19:19
Replies: 34
Views: 4,589
Posted By thebajaguy
I remember a 1.3.4 update back in the day while...

I remember a 1.3.4 update back in the day while at GVP preparing OS loads for the hard cards. There apparently was one with that version, but the details are thin what it had fixed:
...
Forum: support.Hardware 25 May 2023, 19:08
Replies: 11
Views: 867
Posted By thebajaguy
Motorola chose to ignore the use of the parity...

Motorola chose to ignore the use of the parity bit. That's the reason for the x8 or x32 -bit nature of SIMMs used by the Amiga.

During the late 1980's/early 1990's, 8-bit/9-bit memory on 30-pin...
Forum: support.Hardware 25 May 2023, 18:59
Replies: 57
Views: 4,368
Posted By thebajaguy
68EC030 - means no MMU, so the cache control...

68EC030 - means no MMU, so the cache control (allowed/denied) of various 16MB address chunks is limited to the TTx register settings.

Does the data cache turned on or off make a difference when...
Forum: support.Hardware 22 May 2023, 22:56
Replies: 57
Views: 4,368
Posted By thebajaguy
Edit - misread the machine type. Deleted my...

Edit - misread the machine type. Deleted my comment.
Forum: support.Hardware 22 May 2023, 22:45
Replies: 11
Views: 867
Posted By thebajaguy
No - the pinout for GVP 64-pin SIMMs are unique. ...

No - the pinout for GVP 64-pin SIMMs are unique.

Also, GVP 4MB SIMM32's are all 60ns, and IIRC uses a more rare 4K-type refresh part.
Forum: support.Hardware 13 May 2023, 21:20
Replies: 13
Views: 1,269
Posted By thebajaguy
The A1200 has support for the PCMCIA, and the...

The A1200 has support for the PCMCIA, and the A4000 does not.

The A4000D/T has Ramsey, and the A1200 does not.

There may be some subtle differences in the IDE as Gaye is in the A600/A1200 and...
Forum: support.Hardware 13 May 2023, 21:10
Replies: 2
Views: 433
Posted By thebajaguy
(M) chose to remove the least used floating-point...

(M) chose to remove the least used floating-point instructions as time went on. 882->040 FPU -> 060 FPU - in simplistic terms, the newer FPUs gained a subset of the FPU instructions of the CPU/FPU...
Forum: support.Hardware 09 May 2023, 02:09
Replies: 59
Views: 14,857
Posted By thebajaguy
https://bigbookofamigahardware.com/ is the main...

https://bigbookofamigahardware.com/ is the main and updated site.

I am one of the contributors of updates on the updated site from time to time.
Forum: support.Hardware 09 May 2023, 02:07
Replies: 13
Views: 1,174
Posted By thebajaguy
The Amiga memory map, as defined in the OS...

The Amiga memory map, as defined in the OS design, does not use the upper 2GB for any address. Think of it as the limit of a signed 32-bit integer, with the Most Significant Bit equaling negative...
Forum: support.Hardware 07 May 2023, 23:33
Replies: 6
Views: 785
Posted By thebajaguy
Power on the SCSI cable was originally intended...

Power on the SCSI cable was originally intended only for bus termination.

Modern non-mechanical solid-state devices have a fraction of the load, so it's been adapted to borrow 5V from the SCSI...
Forum: support.Hardware 02 May 2023, 03:52
Replies: 13
Views: 1,269
Posted By thebajaguy
Speaking only of the SCSI & IDE motherboard...

Speaking only of the SCSI & IDE motherboard driver and the ability to begin booting:

The A4000D ROMs have only the IDE driver. It will work in the A4000T, but no SCSI (53C710) controller support....
Forum: support.Hardware 02 May 2023, 03:45
Replies: 5
Views: 425
Posted By thebajaguy
The internal passive resistor packs for SCSI...

The internal passive resistor packs for SCSI termination need to to be of the type 221/331 (220ohm/330ohm).

Pin 1 goes to the [ ] box-marked end of the sip sockets.

This will be suitable for...
Forum: support.Hardware 27 April 2023, 02:11
Replies: 15
Views: 1,157
Posted By thebajaguy
For a greater understanding: Singled Ended -...

For a greater understanding:

Singled Ended - is 5v/0v signaling logic. The cable's even-numbered lines are used for signal lines paired/paralleled with grounded lines (odd) next to them on the...
Forum: support.Hardware 27 April 2023, 01:51
Replies: 15
Views: 1,157
Posted By thebajaguy
I was merely giving advice if you desired to...

I was merely giving advice if you desired to remove the onboard termination.

I also wished I caught the drive model earlier. That's the other catch.

The thing with Wide SCSI drives (the model...
Forum: support.Hardware 25 April 2023, 23:10
Replies: 15
Views: 1,157
Posted By thebajaguy
Sans the most earliest Impact HC Rev 3, and...

Sans the most earliest Impact HC Rev 3, and SCSI+RAM-1/0 models, GVP left off the fuse/diode on all other products. I've seen a few of those early cards with fried diodes. More than blue smoke was...
Forum: support.Hardware 25 April 2023, 22:59
Replies: 7
Views: 614
Posted By thebajaguy
5V should be present (+/- 5%) at all points of...

5V should be present (+/- 5%) at all points of the motherboard and also on the accelerator. If it's within spec in most areas, but low somewhere on the accelerator, say the RAM section, it may be...
Forum: support.Hardware 25 April 2023, 01:58
Replies: 15
Views: 1,157
Posted By thebajaguy
The GVP board won't supply the needed 5V on the...

The GVP board won't supply the needed 5V on the external port pin by default for an active terminator. There is a missing fuse (suggested) and diode (needed) to prevent accidental back-flow from...
Forum: support.Hardware 25 April 2023, 01:45
Replies: 10
Views: 895
Posted By thebajaguy
If by chance you have an actual MC version of the...

If by chance you have an actual MC version of the 40MHz 68040, they will run cooler than the earlier XC masks. Similar to the 68060, they did go through errata corrections before they became...
Forum: support.Hardware 23 April 2023, 20:38
Replies: 15
Views: 1,157
Posted By thebajaguy
Reads like termination issues on the SCSI bus. ...

Reads like termination issues on the SCSI bus.

The controller has termination. If you have a very short cable, you may need to have termination removed on the drive. It's out of common SCSI spec...
Forum: support.Hardware 21 April 2023, 02:21
Replies: 6
Views: 807
Posted By thebajaguy
You might give the Amiga Test Kit from Keir...

You might give the Amiga Test Kit from Keir Frazer a try (on Github, just search). It might find something.
Forum: support.Hardware 18 April 2023, 02:30
Replies: 4
Views: 576
Posted By thebajaguy
I think Kickstart (this is early 1987, so...

I think Kickstart (this is early 1987, so Kickstart 1.1/v31 or v32, or Kickstart 1.2/v33 was generally around for the A1000) was only going to probe for 512K ChipRAM, and stop at 256K if there was no...
Forum: support.Hardware 16 April 2023, 02:35
Replies: 13
Views: 1,269
Posted By thebajaguy
This might also be one for Chucky to ponder. ...

This might also be one for Chucky to ponder.

I'd manually write a few byte patterns (00FF00FF/FF00FF00/AA55AA55/55AA55AA) starting at the bottom, then look at low ChipRAM (matching the address...
Forum: support.Hardware 14 April 2023, 00:50
Replies: 6
Views: 558
Posted By thebajaguy
True, from the perspective of Hardware AutoConfig...

True, from the perspective of Hardware AutoConfig - the A500 has none unless one connects something on the 86-pin edge connector.

For the 68K machines:

Kickstart has a memory detect/test...
Forum: support.Hardware 13 April 2023, 02:47
Replies: 730
Views: 462,813
Posted By thebajaguy
Each ROM in a 16-bit (single ROM) configuration...

Each ROM in a 16-bit (single ROM) configuration is a 512K bank. You burn your choice of kickstart to each bank, and you select your banks by keeping the pins for the upper address lines high or low....
Forum: support.Hardware 13 April 2023, 02:42
Replies: 6
Views: 558
Posted By thebajaguy
All data lines on the trapdoor are on the Agnus...

All data lines on the trapdoor are on the Agnus side of the bus. Any CPU access into the Agnus side will have to yield to Agnus' need for that bus. There are a few buffer chips that separate...
Forum: support.Hardware 12 April 2023, 01:01
Replies: 6
Views: 558
Posted By thebajaguy
I've never set one up, but it follows the typical...

I've never set one up, but it follows the typical trapdoor expansion solution others like it take. Provides additional ChipRAM (if supported by the Agnus), C00000-area RAM, and likely fills in...
Forum: support.Hardware 12 April 2023, 00:42
Replies: 14
Views: 1,148
Posted By thebajaguy
Where do I know the limit of one external? I...

Where do I know the limit of one external?

I worked for GVP back in the day. We built and sold external floppy disk units. That was C= spec, and it was based a simple electrical reason.

The...
Forum: support.Hardware 11 April 2023, 02:04
Replies: 14
Views: 1,148
Posted By thebajaguy
Paula and the 8520's support 4x floppy disks...

Paula and the 8520's support 4x floppy disks (SEL0-SEL3). The PSUs support all internals, and up to one external. Any additional externals after the first unit must be powered externally. Length...
Forum: support.Hardware 11 April 2023, 02:01
Replies: 47
Views: 5,972
Posted By thebajaguy
I got 16MB of 60ns SCRAM a few years ago - I'm...

I got 16MB of 60ns SCRAM a few years ago - I'm glad I did when I had the chance.
Forum: support.Hardware 11 April 2023, 01:59
Replies: 13
Views: 1,269
Posted By thebajaguy
Kickstart does a test of the ChipRAM (2MB),...

Kickstart does a test of the ChipRAM (2MB), RAMSEY FastRAM (16MB), and the Accelerator RAM range (128MB). If the software is detecting something valid, it adds it to the memory list.

Possibly the...
Forum: support.Hardware 09 April 2023, 22:32
Replies: 47
Views: 5,972
Posted By thebajaguy
I think they want the Static Column RAM speed...

I think they want the Static Column RAM speed benefit.

The ZIP2SIMM will work, but the SIMMs are only equal to the Page Mode type.
Forum: support.Hardware 03 April 2023, 01:53
Replies: 48
Views: 4,995
Posted By thebajaguy
The power supply has to provide stable 5V to the...

The power supply has to provide stable 5V to the system. Accelerator cards and other peripherals load down the line fairly hard. I'd poke around at the various corners of the machine with a digital...
Forum: support.Hardware 03 April 2023, 01:44
Replies: 3
Views: 625
Posted By thebajaguy
I would give every socketed DIP chip a slight...

I would give every socketed DIP chip a slight lift and re-seat. Oxidation could be a factor.

One cap on the A500 motherboard that does matter is the cap in the reset circuit. If the through-hole...
Forum: support.Hardware 01 April 2023, 02:53
Replies: 5
Views: 772
Posted By thebajaguy
Under 68000 CPU enhancement boards were still...

Under 68000 CPU enhancement boards were still popular going back to the CSA and Microbotics offerings, and others, and they worked in the A2000 if they didn't physically bump into something under the...
Forum: support.Hardware 31 March 2023, 05:07
Replies: 5
Views: 772
Posted By thebajaguy
That was Supra's answer to the AdSpeed. Both...

That was Supra's answer to the AdSpeed. Both were quick and dirty money printers for very little performance return. In today's modern climate, the HC533 and similar up-clocked 68000 CPUs with real...
Forum: support.Hardware 22 March 2023, 02:57
Replies: 4
Views: 549
Posted By thebajaguy
If you get an LED going bright, Kickstart is...

If you get an LED going bright, Kickstart is executing.

DiagROM - need a serial port to see what it may be outputting in very early stages if it's executing at all.

Is there a trapdoor module? ...
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