Forum: Hardware mods
05 December 2021, 11:32
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Replies: 260
Views: 71,298
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Forum: Hardware mods
22 November 2021, 11:46
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Replies: 260
Views: 71,298
It does sound good. Super simple hardware and...
It does sound good. Super simple hardware and save the complexity for the drivers. A little faster than a floppy is good enough IMO.
Maybe people would enjoy a simple microSD card interface added...
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Forum: Hardware mods
20 November 2021, 09:12
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Replies: 260
Views: 71,298
It's a neat idea, to have modular boards with a...
It's a neat idea, to have modular boards with a connector on the side. Maybe 2.00mm to save space? Then there could be a SRAM ranger board, SRAM auto-config board, DRAM board, or whatever people want...
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Forum: Hardware mods
19 November 2021, 09:23
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Replies: 260
Views: 71,298
Do you mean to remove the SRAMs and have a...
Do you mean to remove the SRAMs and have a separate board for memory? The fastram in ranger-space was very novel and cute solution, but these are also interesting ideas.
How would you do DRAM and...
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Forum: Hardware mods
26 September 2021, 13:36
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Replies: 260
Views: 71,298
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Forum: Hardware mods
16 September 2020, 16:18
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Replies: 634
Views: 248,108
It might be difficult to achieve with one DPDT...
It might be difficult to achieve with one DPDT switch, but I think you could get total system ram to 512k if:
- JP4 on Gary adapter to "512K".
- EXRAM disconnected on trapdoor board (some had a...
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Forum: Hardware mods
16 September 2020, 11:57
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Replies: 634
Views: 248,108
Hi,
The jumpers can be a bit confusing, even...
Hi,
The jumpers can be a bit confusing, even for me. So here's the best set up:
1.0 Chip RAM + 1.5 Slow RAM = 2.5 total
Motherboard: Install MOS 8372A Agnus and bend pin 41 if REV 5 (google...
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Forum: Hardware mods
10 September 2020, 12:27
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Replies: 634
Views: 248,108
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Forum: Hardware mods
05 June 2020, 09:21
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Replies: 634
Views: 248,108
Whilst you might be able to map 1MB chip ram...
Whilst you might be able to map 1MB chip ram using the 8371, the DMA registers inside that chip are not wide enough. Software could therefore start crashing once it needs chip RAM past the first...
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Forum: Hardware mods
06 May 2020, 05:57
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Replies: 634
Views: 248,108
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Forum: Hardware mods
13 February 2020, 02:20
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Replies: 145
Views: 48,907
If you are going to tinker with this, take care...
If you are going to tinker with this, take care with the Kicad schematic. I think VMA (pin 19 of old 68000 socket) is driven wrongly. It should come out of a 74LS157 mux. IMO I would dump the 157s...
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Forum: Hardware mods
10 February 2020, 11:01
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Replies: 145
Views: 48,907
Yes, add this to your IDE board. I ebayed a...
Yes, add this to your IDE board. I ebayed a couple MC68HC000FNs :)
Did Iscord try your idea of changing the caps? Seems like a solvable problem. There is an error in the schematic of connecting...
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Forum: Hardware mods
08 February 2020, 00:48
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Replies: 145
Views: 48,907
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Forum: Hardware mods
24 September 2019, 11:29
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Replies: 634
Views: 248,108
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Forum: Hardware mods
20 September 2019, 14:06
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Replies: 634
Views: 248,108
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Forum: Hardware mods
31 March 2019, 08:10
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Replies: 634
Views: 248,108
You have put extra DIP DRAMs onto the...
You have put extra DIP DRAMs onto the motherboard? Unfortunately, it won't work with this board. IIRC - my memory is vague - it won't be able to split out the second RAS (RAS1) and thus fail. Your...
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Forum: Hardware mods
04 March 2019, 02:55
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Replies: 14
Views: 2,987
It would be neat to recreate a different RAM-32...
It would be neat to recreate a different RAM-32 with SOJ pads on it. I also have a VXL-030 in the cupboard without any ram board, so it's useless. But nobody knows the RAM-32 pin-outs and there are a...
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Forum: Hardware mods
26 January 2019, 07:35
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Replies: 634
Views: 248,108
Hi patzik,
I'm trying to help you out to...
Hi patzik,
I'm trying to help you out to avoid wasting boards/money on this:
- You used a different CAM file, so the ground plane changed. The margins are too tight in a few places. Look at the...
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Forum: Hardware mods
24 December 2018, 01:04
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Replies: 634
Views: 248,108
If you want to test it early, it's best to do...
If you want to test it early, it's best to do that BEFORE putting more than 1 RAM chip and the 74F139. After that, you'll need the gary adapter. I haven't looked at the circuit lately, but leaving...
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Forum: Hardware mods
04 October 2018, 10:02
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Replies: 634
Views: 248,108
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Forum: Hardware mods
24 June 2018, 10:04
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Replies: 19
Views: 9,449
Hi cmorley,
I guess you're twiddling the A9...
Hi cmorley,
I guess you're twiddling the A9 during RAS/CAS to get 4 different regions in the RAM chip, hence the CPLD. Then you delay the RAS/CAS to the chip to give enough setup time for the...
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Forum: Hardware mods
30 April 2018, 10:53
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Replies: 634
Views: 248,108
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Forum: Hardware mods
05 April 2018, 13:06
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Replies: 634
Views: 248,108
Even EXRAM is "don't care" on a A500+ because...
Even EXRAM is "don't care" on a A500+ because it's not connected on the motherboard!
I looked for the B52/floppy BMP files but couldn't find them. Maybe I'll check another computer later.
Nice...
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Forum: Hardware mods
03 April 2018, 04:45
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Replies: 634
Views: 248,108
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Forum: Hardware mods
08 February 2018, 05:11
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Replies: 634
Views: 248,108
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Forum: Hardware mods
29 January 2018, 09:20
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Replies: 634
Views: 248,108
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Forum: Hardware mods
25 January 2018, 09:57
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Replies: 634
Views: 248,108
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Forum: Hardware mods
11 January 2018, 06:31
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Replies: 634
Views: 248,108
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Forum: Hardware mods
25 November 2017, 10:12
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Replies: 634
Views: 248,108
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Forum: Hardware mods
15 November 2017, 10:00
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Replies: 634
Views: 248,108
Selecting 0.5 CHIP on the Gary board doesn't...
Selecting 0.5 CHIP on the Gary board doesn't actually make it happen, you're just informing it you have 0.5. To really get 0.5MB you would need to return JP2 (motherboard) to the original factory...
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Forum: Hardware mods
04 November 2017, 03:36
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Replies: 634
Views: 248,108
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Forum: Hardware mods
03 November 2017, 13:42
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Replies: 634
Views: 248,108
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Forum: Hardware mods
03 November 2017, 11:01
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Replies: 634
Views: 248,108
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Forum: Hardware mods
20 October 2017, 12:07
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Replies: 634
Views: 248,108
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Forum: Hardware mods
20 October 2017, 11:35
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Replies: 634
Views: 248,108
That wouldn't work very well thru the trapdoor....
That wouldn't work very well thru the trapdoor. You need to add the 0.5MB onboard DIP chips and turn it into a realistic A500+. Then you can use this board to add another 1.0 MB (2.0 MB total CHIP...
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Forum: Hardware mods
29 September 2017, 07:31
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Replies: 11
Views: 2,940
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Forum: Hardware mods
23 September 2017, 01:44
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Replies: 634
Views: 248,108
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Forum: Hardware mods
22 September 2017, 11:36
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Replies: 634
Views: 248,108
Just 100nF for the RTC isn't enough. When you...
Just 100nF for the RTC isn't enough. When you flick the power switch off, the voltage on the RTC briefly dips way down (around 2V) and it will sometimes forget time/date. I watched it on a scope. It...
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Forum: Hardware mods
20 September 2017, 12:19
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Replies: 634
Views: 248,108
IMO C3, C6, C23, C11 are not needed - I run...
IMO C3, C6, C23, C11 are not needed - I run happily without them. Pads are there just in-case.
C13/C19 are alternatives. Only one of them is needed. Any value >=4.7uF will be fine. 2.2uF ceramic...
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Forum: Hardware mods
19 September 2017, 13:51
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Replies: 634
Views: 248,108
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